bluuebunny/crossref_metadata_2025 huggingface dataset:
Inclusion Selectivity of the Zeolite-Mimetic Host Clathrate [N(CH3)4·xG][Cd3(CN)7] for Aromatic C8H10 (= G) Isomers, Ethylbenzene and Xylenes
Authors: Kim Chong-Hyeak , Nishikiori Shin-ichi , Iwamoto Toschitake
Published: March 2006

The anionic host [Cd3(CN)7−]n with the three-dimensional structure like zeolite shows the highest inclusion selectivity for ethylbenzene from the binary, ternary, and quarternary mixtures of ethylbenzene and three xylene isomers in the fractional enclathration-crystallization process; p-xylene is the second.
Oxygen Atom Transfers from μ-Oxo-bis(Oxomolybdenum(V) Porphyrin) to Chromium(II) Porphyrins in Toluene
Authors: Yamashita Shinichi , Imamura Taira , Sasaki Yoichi
Published: March 2006

Simple complete oxygen-atom transfers between metalloporphyrins mediated by two-electron pathways were observed quantitatively from μ-oxo-bis(oxomolybdenum(V) porphyrin), [MoO(tpp)]2O,1 to chromium(II) porphyrins, Cr(por) (por = tpp or oep), in toluene.

O=Mo(tpp)-O-(tpp)Mo=O + Cr(por) → 2O=Mo(tpp) + O=Cr(por)

The presence of excess of CrII(por) yielded [CrIII(por)]2O.
Influence of Incorporation of 4,4′-Biphenol and Hydroquinone Units into Poly(ethylene terephthalate) on the Crystallization Properties
Authors: Sakaguchi Yoshimitsu
Published: March 2006

A PET copolymer containing small amount of 4,4′-diphenyldicarboxylic acid and 4,4′-biphenol showed higher crystallization rate than PET at the crystallization temperatures below 160 °C. When hydroquinone was incorporated instead of 4,4′-biphenol, the crystallization rate was lower than that of PET at whole range of crystallization temperatures. These results suggest a possibility of increasing the crystallization rate of PET by incorporation of an appropriate arylate-unit.
Synthesis of 3-Bromo-1,5- and -1,7-Azulenequinones Having Some Alkyl or Phenyl Group by the Polybromination and Reductive Debromination of Their Bromo-Substituent
Authors: Nozoe Tetsuo , Wakabayashi Hidetsugu , Shindo Kimio , Yasunami Masafumi
Published: March 2006

2-Methyl-, 2-phenyl-, 5- and 6-isopropylazulenes, and 5-isopropyl- and 6-isopropyl-2-methylazulenes were led to the corresponding 1,5- and 1,7-azulenequinones by polybromination in aqueous THF. 1-Carboxylic acid derivatives of these alkylazulenes also gave same products. Three isomeric 2-methyl derivatives of 3,3-biazulenequinones were produced from 2-methylazulene as minor products. Treatment of bromoazulenequinones with tin powder in acetic acid afforded the corresponding parent quinones.
Diaza-18-crown-6-based Sugar Receptor Bearing Two Boronic Acids. Possible Communication between Bound Sugars and Metal Cations
Authors: Nakashima Kazuaki , Shinkai Seiji
Published: March 2006

A novel diaza-18-crown-6-based sugar receptor (1) bearing two boronic acids has been developed. In 1 boronic acids in the side arms and a metal cation bound to the crown cavity competitively interact as Lewis acids with amines. It was shown that sugars and metal cations can “communicate” each other in an allosteric manner.
Preparation and Extraction of Ca@C60
Authors: Kubozono Yoshihiro , Ohta Takayoshi , Hayashibara Tosiyuki , Maeda Hironobu , Ishida Hiroyuki , Kashino Setsuo , Oshima Kokichi , Yamazaki Hitoshi , Ukita Sigeyuki , Sogabe Toshiaki
Published: March 2006

Endohedral metallofullerene Ca@C60 has been prepared by archeating of graphite rod containing calcium oxide, CaO, and extracted by pyridine under the oxygen-free condition. The laser desorption time-of-flight (LD-TOF) mass spectrum of the pyridine solution exhibits five main peaks due to C60+, Ca@C60+, C70+, Ca@C70+, and C74+. It has been found that Ca@C60 can be extracted only under the atmosphere of degassed pyridine owing to its high oxygen-sensitivity.
Preparation of Enolates from α-Haloketones with n-BuLi, PhMgBr, or Et2Zn via Halogen-Metal Exchange Reaction
Authors: Aoki Yoshitaka , Oshima Koichiro , Utimoto Kiitiro
Published: March 2006

Metal-halogen exchange of α-iodoketones was performed upon treatment with n-BuLi, PhMgBr, Et2Zn or Me3Al in ether at 0 °C to give the corresponding metal enolates which reacted with aldehydes to provide the aldol type products in good yields.
Kinetic Behaviors of Solubilization of C60 into Water by Complexation with γ-Cyclodextrin
Authors: Kuroda Yasuhisa , Nozawa Hiroshi , Ogoshi Hisanobu
Published: March 2006

Kinetic behavior of complexation of C60 with γ-cyclodextrin and its derivative in an aqueous solution at 50 °C was investigated. Effective solubilization of C60 into water, which shows first order dependency on the concentration of unsubstituted γ-cyclodextrin under present conditions, is observed. However, γ-cyclodextrin having an ammonium cation moiety on the primary site shows no sign of extraction of C60.
Efficient α-Alkylation of α-Amino Acids by Means of a Novel Pyridoxal Model Compound
Authors: Miyashita Kazuyuki , Miyabe Hideto , Kurozumi Chiaki , Imanishi Takeshi
Published: March 2006

α-Alkyl-α-amino esters were prepared by the alkylation of α-imino esters obtained from α-amino acids and a novel PLP model compound possessing a Li+ ionophore character.
Atrazine-selective Polymer Prepared by Molecular Imprinting Technique
Authors: Matsui Jun , Doblhoff-Dier Otto , Takeuchi Toshifumi
Published: March 2006

A synthetic atrazine-selective polymer was prepared by molecular imprinting technique. Liquid-chromatographic (LC) tests were performed using both the polymer imprinted against atrazine and a reference non-imprinted polymer as LC stationary phases. Atrazine was retained 13-fold longer in the imprinted polymer than in the non-imprinted polymer.
The Reason Why K10 is an Effective Promoter for meso-Tetraalkylporphyrin Synthesis
Authors: Shinoda Tomotaka , Onaka Makoto , Izumi Yusuke
Published: March 2006

The reason why K10 is an efficient promoter for porphyrin synthesis is found to be due mainly to the mesoporosity rather than to the acid property of K10, by comparing K10 with progressively acid-treated montmorillonites.
Proposed Models of Mesopore Structures in Sulfuric Acid-Treated Montmorillonites and K10
Authors: Shinoda Tomotaka , Onaka Makoto , Izumi Yusuke
Published: March 2006

The models of pore structures of commercially available K10 and sulfuric acid-treated montmorillonites are proposed on the basis of XRD, NMR, and N2 adsorption-desorption isotherm measurements.
Molecular Design of Chromogenic Calix[4]crowns Which Show Very High Na+ Selectivity
Authors: Yamamoto Hiromasa , Ueda Keiko , Sandanayake K R A Samankumara , Shinkai Seiji
Published: March 2006

Chromogenic calix[4]crowns bearing a short crown strap for the metal recognition and an azophenol unit for the optical reading-out were designed and synthesized. Two-phase solvent-extraction established that they show remarkably high Na+/K+(>103.1) selectivity. This discrimination ability is high enough to apply them as a Na+-selective ionophore for optical sensing systems.
Two Dimensional Photoinduced Electron Transfer (PET) Fluorescence Sensor for Saccharides
Authors: Sandanayake K R A Samankumara , James Tony D , Shinkai Seiji
Published: March 2006

The cooperative binding of two boronic acid moieties has been utilized to create a two dimensional fluorescence sensor for saccharides. The photoinduced electron transfer switching mechanism has been used to provide information of saccharide concentration while the excimer emission changes of the pyrene moieties provide the nature of the complex.
The π-Trianion Radical of 2,3,6,7-Tetracyanobenzo[1,2-b:4,5-b’]bisdithiole-4,8-dione. Observation of ESR with 13C-Satellites in Natural Abundance
Authors: Hirayama Masatoshi , Itasaka Manabu , Suzuki Takanori , Yamashita Yoshiro , Miyashi Tsutomu
Published: March 2006

The π-trianion radical of the title compound was formed by electrolysis in acetonitrile and its ESR spectrum with 13C satellites in natural abundance was observed, which was clearly identified by MO calculation.
Isolation and X-Ray Structure of a New 3,6-Diketo Steroid from Red Alga Hypnea Musciformis
Authors: Gosavi Kalpana , Babu J Moses , Mathur Hari Har , Bhadbhade Mohan
Published: March 2006

The structure of a 3,6-diketo steroid, isolated from red alga Hypnea musciformis is the first of this class to be confirmed by X-ray analysis. Ring junctions A/B, B/C and C/D are all trans ; the configuration of angular methyl groups at C(10), C(13) and the cholesterol-like side chain with a double bond C22=C23 emanating from C(17) have been settled as ß-axial.
A New Homologous Series of Phenol Derivatives Exhibiting Liquid Crystalline Phase
Authors: Sakagami Sakumitsu , Takase Akira
Published: March 2006

A new homologous series of 4-(4-n-alkoxy-2-hydroxybenzylideneamino)phenol was synthesized, and the phase transitions were determined using a differential scanning calorimeter and an ordinary polarizing microscope. It is shown that the homologues having a terminal alkoxyl chain longer than C10-member exhibit a smectic phase through an intermolecular hydrogen bonding.
Peroxidase Activity of Cytochrome c Generated by Phenylboronic Acid Modification
Authors: Hamachi Itaru , Kimura Onari , Takeshita Hiroshi , Shinkai Seiji
Published: March 2006

Reactive amino residues of horse heart cytochrome c were successfully modified with 4-boronobenzoic acid N-hydroxysuccinimide ester 1. The modified cytochrome c shows an enhanced peroxidase activity, which can be regulated by the addition of sugars.
1,2-Asymmetric Induction in the Intramolecular [2+2] Cycloadditions of Keteniminium Salts. Enantioselective Syntheses of (−)-Dihydroactinidiolide and (−)-Anastrephin
Authors: Irie Osamu , Shishido Kozo
Published: March 2006

1,2-Asymmetric induction in the intramolecular [2+2] cycloadditions of the keteniminium salts resulted in the preferential formation of optically pure bicyclo[4.2.0]octan-7-ones (13a,b). These cycloadducts, 13a and 13b, were successfully converted into the key intermediates of (−)-dihydroactinidiolide and (−)-anastrephin, respectively.
Photolysis of Perfluoroazooctane in Perfluorohexane upon 185 nm Irradiation
Authors: Nakamura Takako , Yabe Akira
Published: March 2006

The photolysis of perfluoroazooctane in perfluorohexane upon 185 nm irradiation was investigated by means of quantum yield, light intensity dependence, and UV-vis spectra of the photolysis of perfluoroazooctane. Perfluoroazooctane (trans isomer) was photoisomerized by one photon absorption to cis isomer, followed by extrusion of nitrogen by another photon absorption.
Separation of Chlorophylls by Micellar Electrokinetic Chromatography with Pyridine-Added Running Solution
Authors: Kato Hisashi , Saitoh Koichi , Teramae Norio
Published: March 2006

Successful separation of chlorophylls-a, -b, -c1 and -c2 can be obtained in about 15 min by MEKC with the running solution containing 50 mmol/dm3 SDS (pH 11)-pyridine (10:3, v/v).
Structure and Properties of an Organic Metal (BEDT-TTP)2I3
Authors: Mori Takehiko , Misaki Yohji , Yamabe Tokio , Mori Hatsumi , Tanaka Shoji
Published: March 2006

An organic radical-cation salt (BEDT-TTP)2I3, where BEDT-TTP (2,5-bis(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) is a bis-fused analog of BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene), has a donor arrangement similar to β-(BEDT-TTF)2I3. (BEDT-TTP)2I3 shows high conductivity 900 S cm−1 at room temperature, and retains its metallic conductivity down to 0.5 K.
The Site of the Sonochemically-Initiated Radical Reaction of Lead Tetraacetate with β-Methylstyrene
Authors: Kimura Takahide , Fujita Mitsue , Sohmiya Hajime , Ando Takashi
Published: March 2006

The effective temperature of the radical propagation step of the ultrasonically accelerated reaction of lead tetraacetate with β-methylstyrene was thermodynamically determined as close to the ambient temperature of the bulk liquid.
Electrocatalytic Dehydrofluorination of Poly(vinylidene fluoride)
Authors: Kijima Masashi , Toyabe Tsuyoshi , Shirakawa Hideki
Published: March 2006

Poly(vinylidene fluoride) was dehydrofluorinated by cathodic electrolysis in DMF in the presence of t-BuOH as a mediator under the anaerobic conditions, giving poly(fluoroacetylene) with a carbyne moiety. Electrical conductivity of the product was 3.9 × 10−3 S cm−1 upon I2 doping.
Thermal Decomposition of Lanthanum Trifluoromethanesulfonate
Authors: Yanagihara Naohisa , Nakamura Shin , Nakayama Masayoshi
Published: March 2006

Lanthanum trifluoride (LaF3) has been obtained as the final product of the thermal decomposition of the corresponding trifluoro-methanesulfonate [La(OTf)3]. The decomposition processes up to 600 °C were characterized by means of TG, DTA, XRD and MS. It was revealed that the over all reaction scheme for the decomposition proceeds as follow: La(OTf)3→ LaF3 + 3SO2 + CO2 + CF3OCF3.
Remarkable Effect of Surfactant on Flavin Photochemistry: Monomerization of Thymine Cyclobutane Dimers Photosensitized by Flavins in the Presence of SDS in Aqueous Solution
Authors: Yasuda Masahide , Nakazono Takumi , Hamasaki Takeshi , Nishinaka Yoshimasa , Nakamura Nobuya , Pac Chyongjin , Shima Kensuke
Published: March 2006

The photosensitization capability of tetra-O-acyl riboflavins in the monomerization of the cis,syn-cyclobutane dimers of 1,3-dimethylthymine and 1-propylthymine in aqueous solutions was remarkably enhanced by sodium dodecyl sulfate at higher concentration than critical micelle concentration.
Highly Stereoselective Synthesis of Trisubstituted γ,δ-Unsaturated Acid and Aldehyde via Ketal Claisen Rearrangement
Authors: Takayanagi Hisao , Morinaka Yasuhiro
Published: March 2006

A new sequence for the highly stereoselective (E>99%) synthesis of a trisubstituted γ,δ-unsaturated acid (3), which consists of a ketal Claisen rearrangement of a terpene allylic alcohol with 2,2-dimethoxy-3-methyl-3-butanol and a subsequent oxidative cleavage of the resulting α-ketol, is applicable even to the preparation of 3 which is difficult to synthesize by traditional methods. The related procedure for preparation of the corresponding aldehyde is also described.
Homogeneous Bimetallic Catalysts for Production of Carboxylic Acids from Carbon Dioxide, Hydrogen, and Organic Iodides
Authors: Fukuoka Atsushi , Gotoh Naotaka , Kobayashi Norikazu , Hirano Masafumi , Komiya Sanshiro
Published: March 2006

Carboxylic acids RCOOH (R = Me, Et, Ph) are catalytically produced from carbon dioxide, dihydrogen, and the corresponding organic iodides in the presence of homogeneous Ru/Co or Ni/Co bimetallic catalysts.
High Resolution ESR Spectra as Obtained by FT-ESR Spectroscopy
Authors: Mizuta Yukio , Kohno Masahiro , Fujii Kanae , Yoshida Ekuo , Kuwata Keiji
Published: March 2006

Superhyperfine couplings due to K+ in K+/ duroquinone− ion-pair system in DME solution were clearly observed by use of FT-ESR spectroscopy. The superhyperfine coupling constant obtained at room temperature suggested that the population of the unpaired electron on the 39K+ 4s orbital was as small as 0.14%.
Synthesis of 1-Formyl-1,2-dihydroquinoline Derivatives by a Lewis Acid-Catalyzed Cyclization of o-(1-Hydroxy-2-alkenyl)phenyl Isocyanides
Authors: Kobayashi Kazuhiro , Nagato Satoshi , Kawakita Masataka , Morikawa Osamu , Konishi Hisatoshi
Published: March 2006

An efficient route to 1-formyl-1,2-dihydroquinolines 6 is described based on the BF3-catalyzed cyclization of o-(1-hydroxy-2-alkenyl)phenyl isocyanides 4, which can be prepared feasibly by the reaction of N-(o-acylphenyl)formamides 1 with alkenylmagnesium bromides 2 followed by treatment of the resulting hydroxy formamides 3 with phosphorous oxychloride.
Collection of Metal(II)-1-(2-Pyridylazo)-2-naphthol Complexes in Nonionic Surfactant Assembly Adsorbed on Silica Gel
Authors: Bessho Kotaro , Saitoh Koichi , Teramae Norio
Published: March 2006

The nonionic surfactant phase adsorbed on silica gel is proposed as a new medium for the separation and concentration of trace metal chelates. The 1-(2-pyridylazo)-2-naphthol chelates of Ni(II) and Zn(II) can be concentrated into the nonionic surfactant phase on silica gel. It was found that these hydrophobic compounds were collected by dissolution into the surfactant assembly formed at the silica / water interface.
Synthesis of Novel π-Conjugated Cyclic Trinuclear Complex of Cobalt(III) and Intramolecular Electronic Interactions in Its Reduced Forms
Authors: Okuno Mika , Aramaki Kunitsugu , Nakajima Shin-ichiro , Watanabe Tokuko , Nishihara Hiroshi
Published: March 2006

An oligomerization reaction of an ethylene-1,2-dithiolatocobalt complex, [CoCp(S2C2H2)](Cp = η5-cyclopentadienyl)) (1) in HBr-MeCN-H2O in air affords a conjugated trinuclear complex, [Co3Cp3(S6C6)] (3), that undergoes reversible three-step 1e− reductions in aprotic solvents. Electrochemical, optical and magnetic properties of 3 and its reduced forms are reported.
Quinone-Mediated Bioelectrochemical Reduction of NAD(P)+ Catalyzed by Flavoproteins
Authors: Kano Kenji , Takagi Kazuyoshi , Ogino Yasuhiro , Ikeda Tokuji
Published: March 2006

Adriamycin, anthracycline antibiotics, has been found to work as an effective mediator in bioelectrochemical reduction of NAD(P)H catalyzed by ferredoxin-NADP+ reductase or diaphorase. The regeneration system has been satisfactory combined with NAD(P)H-dependent enzymatic reactions.
ESR Study of Radiation Induced Radicals Formed on Tetrafluoroethylene Adsorbed on Mordenite Zeolites
Authors: Yahiro Hidenori , Yamaji Kazumitsu , Shiotani Masaru
Published: March 2006

Two radicals, hydrogen addition-type radicals (CF2H-CF2•), and propagating radical of polytetrafluoroethylene (R-CF2-CF2•), were generated by γ-irradiation of tetrafluoroethylene adsorbed on zeolites. The formation mechanisms for two radicals are discussed based on the ESR results.
Synthesis of Helical Polymers by Polycondensation of Diboronic Acid and Chiral Tetrols
Authors: Mikami Masafumi , Shinkai Seiji
Published: March 2006

Polymers containing sugar units in the main chain were synthesized by polycondensation of diboronic acid and C2-symmetrical chiral tetrols. Spectroscopic studies and theoretical calculations established that they possess a DNA-like helical structure.
Adsorption and Dimer Formation of Nitrogen Monoxide on Pt(111) at Low Temperature
Authors: Yoshinobu Jun , Kawai Maki
Published: March 2006

Adsorption and thermal reaction of NO on Pt(111) at temperatures from 25 K to 80 K have been studied by means of infrared reflection absorption spectroscopy. The physisorbed NO molecules from (NO)2 species on the chemisorbed NO at low temperatures. There are at least two kinds of (NO)2 species. The dimer species are decomposed into NO, which immediately desorbs above ∼40 K. The remaining predominant species after 80 K heating is on-top linear NO species.
Dimeric Hydrogen-Bonded Transition Metal Complex Containing Bidentate Mono-deprotonated 2,2′-Biimidazolate Ligand
Authors: Tadokoro Makoto , Toyoda Jiro , Isobe Kiyoshi , Itoh Tetsuji , Miyazaki Akira , Enoki Toshiaki , Nakasuji Kazuhiro
Published: March 2006

Synthesis and X-ray crystal structure of a capped type of dimeric H-bonded transition metal complex containing bidentate mono-deprotonated 2,2′-biimidazolate ligand were reported.
A Novel Synthesis of Isoindoline and Isoquinoline Using Chromium Carbene Complex
Authors: Mori Miwako , Kuriyama Kayoko , Ochifuji Nagisa , Watanuki Susumu
Published: March 2006

The reaction of diyne 1 which has nitrogen in a tether with chromium carbene complex 2 afforded isoindoline 4 in good yield. In this reaction, the two carbene carbons (carbene carbon of chromium carbene complex and carbon monoxide) reacted with the two alkynes, respectively, to form an aromatic ring, that is, [2+2+1+1] cocyclization. Using this procedure, isoquinoline derivatives, 6a, 7a, and 9a, were synthesized.
Electronic and Steric Effect of Bulky Triphenylsilyl Substituent in the Monooxobenzenedithiolatomolybdenum(V) Complex and the Tungsten Analog as Models of Molybdenum and Tungsten Oxidoreductases
Authors: Oku Hiroyuki , Ueyama Norikazu , Nakamura Akira
Published: March 2006

Monooxotungsten(V) and Monooxomolybdenum(V) complexes with bulky dithiolato ligands, (NEt4)[MVO(Ph3Si-bdt)2] (M = W (1) and Mo(2), Ph3Si-bdt = 3-triphenylsilyl-1,2-benzenedithiolate) were synthesized as models of tungsten and molybdenum oxidoreductases.
Reaction of Alkyne Having Hydroxyphenyl Group with Mo(CO)6
Authors: Kaneta Naotake , Hirai Tomoe , Mori Miwako
Published: March 2006

The reaction of m-and p-hydroxyphenylpropyne, 1a and 1b, with Mo(CO)6 (5 mol%) affords metathesis products, 2a and 2b, in 78% and 14% (conversion yield, 78%) yields, respectively. However, o-hydroxyphenylpropyne 1f gave trimerization product 4 in 65% yield.
New and Efficient Synthesis of Oligomeric Porphyrins via Stepwise Nucleophilic Substitution of Aminoporphyrins to Cyanuric Chloride
Authors: Ichihara Kanako , Naruta Yoshinori
Published: March 2006

Porphyrin oligomers (Pn, n = 2, 3, 4, 5) were prepared by the nucleophilic substitution of amino porphyrin monomers to cyanuric chloride. In this method, two different porphyrins can be joined stepwise to 1,3,5-triazine ring in one-pot by choosing appropriate reaction temperatures. The reaction proceeded under relatively mild conditions (K2CO3 as a base, 61 °C) and in good yields (ca. 80%).
Electronic Spectra of Si Nanocolloids in 2-Propanol
Authors: Zhu Yong , Kimura Keisaku
Published: March 2006

The ultraviolet (UV) and visible spectra of Si nanocolloids in 2-propanol were measured. In UV region, we have found, for the first time, the electronic transition at about 3.5 eV being superimposed by fine structures. The fine structures with the energy spacing around 1000 cm−1 can be related to IR absorption spectra which are assigned to Si-O-Si stretching vibration.
The Rate Constant of Dimer Cation Formation of Triphenylamine and Substituent Effects
Authors: Sumiyoshi Takashi
Published: March 2006

The pulse radiolysis studies of triphenylamine and methyl substituted triphenylamines in 1,2-dichloroethane have indicated that the dimer cation formation is the main process and coupling at the para sites is predominant. The spectrum of transient dimer cations with λmax at 400 and 850 nm, and the dimerization rate constant of k = 1.3 × 108 dm3 mol−1 s−1 were obtained.
Room-Temperature Photoluminescence of a C60 Derivative
Authors: Zhou Dejian , Tan Haisong , Gan Liangbing , Luo Chuping , Huang Chunhui , Yao Guangqing , Zhang Pei
Published: March 2006

The first observations of weak room-temperature photoluminescence of a new C60 derivative: C60(NH(CHCOOMe)2) (1) and its fluorescence quenching by concentration and N,N-dimethyl aniline in CHCl3 solution are reported. Its singlet energy and fluorescence lifetime were estimated to be 40.9 kcal/mol and 1.2 ± 0.3 ns, respectively.
Superstructure Formation of a Synthetic Lipid Bearing a Poly(ethylene glycol) Head Group with α-Cyclodextrin
Authors: Nakashima Naotoshi , Narikiyo Yoshitaka
Published: March 2006

Mixing of an aqueous bilayer of an artificial nonionic lipid bearing a poly(ethylene glycol) as the hydrophilic head group with α-cyclodextrin(α-CD) was found to produce a stable crystalline inclusion complex which possessed the fundamental bilayer characteristic (phase transition) for the first time. 1H-NMR spectra of the complex showed that 2.2 ± 0.1 ethylene glycol units in the lipid were captured in one α-CD molecule.
A Porphyrin-Anchored Ultrathin Poly(vinylchloride) Film: Asymmetric Surface Property as Revealed by Interactions with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone
Authors: Yamada Sunao , Iida Hiroshi , Matsuo Taku
Published: March 2006

An ultrathin poly(vinylchloride) film incorporating amphiphilic 5,10,15,20-tetrakis(4-N-hexadecylpyridyl)porphine at the surface was prepared. Asymmetric surface population of the porphyrin was confirmed by investigating interactions with 2,3-dichloro-4,5-dicyanobenzoquinone in aqueous solutions, using absorption, fluorescence, and in-situ second harmonic generation spectroscopy.
Electrochemical STM Study on Surface Morphology Change of HOPG Basal Plane in an Organic Electrolyte Solution
Authors: Inaba Minoru , Siroma Zyun , Ogumi Zempachi , Abe Takeshi , Mizutani Yasuo , Asano Mitsuru
Published: March 2006

To elucidate the mechanism of surface reactions on graphite anodes of lithium-ion secondary batteries, the morphology change of the basal plane of a highly oriented pyrolytic graphite (HOPG) anode in 1 M LiClO4/ethylene carbonate-diethylcarbonate (1:1 by volume) was observed by electrochemical STM. When the sample potential was stepped to 1.1 V vs. Li/Li+, hill-like structures of ca. 10 Å height appeared on the HOPG surface. The hill-like structure in the vicinity of a step was gradually spread out with time, and a part of it exfoliated. It was considered that the intercalation of solvent is responsible for the formation of the hill-like structure and that this process corresponds to the initial stage of solvent decomposition and subsequent film formation processes.
Time Dependent Electroluminescence Spectra at n-type Porous Silicon/Electrolyte Solution Interface Induced by Hole Injection
Authors: Uosaki Kohei , Noguchi Hidenori , Murakoshi Kei , Kondo Toshihiro
Published: March 2006

Visible electroluminescence (EL) from n-type porous silicon (PS) in an electrolyte solution containing S2O82− was investigated by potential step methods. When the potential was stepped from 0 V to a negative potential (< −1.5 V), EL intensity increased as time proceeded. Time-resolved EL spectra measurements showed that the increase of the EL intensity was accompanied by a blue-shift of the EL spectra and that more negative the applied potential, the faster the rate of blue-shift. These results and the relationship between the emission energy and the size of the Si crystallites in PS due to quantum size effect, suggest that the emission site changed from larger sized Si crystallites to smaller sized ones in the PS layer with time.
Hetero-Ligand Assembly onto Cobalt(III) Complexes
Authors: Yamanari Kazuaki , Kida Makiko , Fujihara Takashi , Fuyuhiro Akira , Kaizaki Sumio
Published: March 2006

Novel cobalt(III) complexes with two kinds of dimerized ligands dapymt-tbba(2-) and tbba-dapymt(1-) are obtained from the mixed system containing Hdapymt and H3tbba ligands (Hdapymt = 4,6-diamino-2-thiouracil and H3tbba = thiobarbituric acid).
C-Glycosylation-Cycloaddition Approach to C-Glycosyl Juglones. Versatile Intermediates toward Aryl C-Glycoside Antibiotics
Authors: Matsumoto Takashi , Sohma Tsukasa , Yamaguchi Hiroki , Suzuki Keisuke
Published: March 2006

An efficient two-step access to C-glycosyl juglones, promising synthetic intermediates toward aryl C-glycoside antibiotics, has been developed based on (1) the O → C-glycoside rearrangement and (2) the regioselective cycloaddition of α-alkoxybenzyne and α-oxyfuran.
Catalytic Addition of Olefinic C–H Bonds to Olefins
Authors: Kakiuchi Fumitoshi , Tanaka Yasuo , Sato Taisuke , Chatani Naoto , Murai Shinji
Published: March 2006

Addition of C–H bonds in α,β-enones to olefins were attained by Ru(H)2(CO)(PPh3)3 catalyst. The reactions of acylated heterocyclic olefins with triethoxyvinylsilane in the presence of the ruthenium catalyst afforded the coupling product in good to excellent yields. The reactions of 3,4-dihydro-6-pivaloyl-2H-pyran with several olefins were also catalyzed by the ruthenium complex to give the corresponding coupling products.
Multi-site Recognition of Flavin Adenine Dinucleotide by Mixed Monolayers on Water
Authors: Taguchi Kazuhiro , Ariga Katsuhiko , Kunitake Toyoki
Published: March 2006

Flavin adenine dinucleotide (FAD) formed a stoichiometric complex at the air-water interface with four molecules of a three-component monolayer that contain guanidinium, diaminotriazine, and orotate head groups. The complementary complexation was confirmed by surface pressure-area isotherm and IR and XPS spectroscopies of the transferred film.
Nomenclature of [60]Fullerene Derivatives by Edge Labeling
Authors: Nakamura Yosuke , Taki Masumi , Nishimura Jun
Published: March 2006

A new nomenclature of [60]fullerene derivatives or adducts is proposed. It can express most derivatives to image their stereochemical properties. Moreover, it can name racemates rather concisely.
New Synthetic Approaches to 1,2,4,5,7-Pentoxocane Derivatives
Authors: Ushigoe Yoshihiro , Nojima Masatomo , McCullough Kevin J
Published: March 2006

Formaldehyde O-oxide reacts with α-alkoxy-α′-hydroperoxy ethers to produce the corresponding adducts which can be cyclized under acidic conditions to yield the novel 1,2,4,5,7-pentoxocane derivatives 4a-c and 8. The structure of the crystalline 1,2,4,5,7-pentoxocane 8 was determined by X-ray crystallographic analysis.
Stabilization of Insulin upon Supramolecular Complexation with Hydrophobized Polysaccharide Nanoparticle
Authors: Akiyoshi Kazunari , Nishikawa Takehiro , Shichibe Syozo , Sunamoto Junzo
Published: March 2006

The hydrogel nanoparticle that was formed by self-assembly of cholesterol-bearing pullulan complexed with 5 - 10 insulin monomers in water. Biocolloidal and thermal stability of insulin drastically increased upon the supramolecular assembly with the hydrophobized polysaccharide.
Synthesis of 2-exo-Methylenepenam by Reductive 1,2-Elimination and S–S Bond Fission in a PbBr2/Al Bimetal System
Authors: Tanaka Hideo , Nishioka Youichi , Kameyama Yutaka , Sumida Shin-ichi , Matsuura Hiroyuki , Torii Sigeru
Published: March 2006

A convenient synthesis of 2-exo-methylenepenam was performed by reductive elimination of a 3,4-disubstituted chlorine atom(s) and/or a triflate moiety and S-S bond fission of the phenylsulfonylthio group of p-methoxybenzyl 3,4-dichloro or 4-chloro-3-(trifluoromethylsulfonyloxy)-2-[4-(phenylsulfonylthio)-2-oxoazetidin-1-yl]-2-butenoate derived from penicillin G in a lead(II) bromide/aluminum bimetal redox system.
Negative Photochromism of 3,1′-Trimethylene-Bridged 6-Nitroindolinospiropyran
Authors: Yokoyama Yasushi , Shiroyama Taisuke
Published: March 2006

A new photochromic nitroindolinospiropyran with a 3,1′-trimethylene bridge was synthesized. Different from the non-bridged spiropyrans it exists mainly as the colored twitter-ionic open form in polar solvents. The following values in CHCl3, DMSO, and CH3OH at 20 °C were determined: (1) molar absorption coefficient of the open form at λmax, (2) Arrhenius’ activation energy, ΔG‡, ΔH‡, and ΔS‡ of thermal coloring and bleaching, (3) ΔG, ΔH, and ΔS of the thermal coloring.
EXAFS/FTIR Characterization and Selective Hydration of Acetonitrile on Silica-Supported [(RhCp*)4V6O19]
Authors: Yamaguchi Masatsugu , Shido Takafumi , Ohtani Hiroko , Isobe Kiyoshi , Ichikawa Masaru
Published: March 2006

Silica-supported [(RhCp*)4V6O19] exhibited high catalytic activities in the gas-phase hydration of acetonitrile towards acetamide at 350-473 K with selectivity of over 97% and dehydrogenation of 2-propanol to acetone. EXAFS, XPS and FTIR studies suggested that thermal evacuation of silica-supported [(RhCp*)4V6O19] at 473 K led to the removal of the bridged oxygen atoms in the V6O19 framework. The resulting deoxygenated samples enhanced the acetonitrile hydration, while catalyzed the dehydration of 2-propanol to propene besides the dehydrogenation reaction, probably owing to the newly generated Lewis acid site.
Molecular Structure of Seven-Coordinate trans(O
6)-(Ethylenediamine-N,N′-diacetato-N,N′-di-3-propionato)(aqua)titanate(III), trans(O
6)-[Ti(eddadp)(H2O)]−
Authors: Miyoshi Katsuhiko , Wang Jun , Mizuta Tsutomu
Published: March 2006

X-ray crystal analysis revealed that the title complex anion has an approximately pentagonal-bipyramidal (PB) structure in which a water molecule and two five-membered glycine chelates lie in an equatorial plane and two propionate groups occupy trans-axial sites. This complex anion is the unprecedented seven-coordinate eddadp complex which moreover has a trans(O6) structure.
Time-Resolved FT-IR Study on Isotopic Exchange of Dinitrosyl Species Strongly Adsorbed on a Co-MFI Zeolite
Authors: Iwamoto Masakazu , Hoshino Yasuyuki
Published: March 2006

Very rapid exchange of NO molecules between the strongly adsorbed dinitrosyl species and NO in gas phase has been found at room temperature on a Co-MFI zeolite. The formation of (14NO)(15NO) species during the reaction indicates that the NO ligands are exchanged one by one.
Control of an α-Chymotrypsin Hydrolytic Activity by a Combination of Phenylboronic Acids and Polyols
Authors: Suenaga Hikaru , Nakashima Kazuaki , Mikami Masafumi , Shinkai Seiji
Published: March 2006

The hydrolytic activity of α-chymotrypsin is inhibited by phenylboronic acids. It was shown that the inhibitory effect is intensified by added diols but rather weakened (i.e., the hydrolytic activity is regenerated) by tripodal additives. Hence, the activity can be controlled in a range of 0–100%. This is a novel method to control the activity of the nucleophilic hydrolytic enzymes.
Highly Syn π-Facial Preference in the Diels-Alder Reactions of 1,2,3,4,5-Pentamethylcyclopentadienes Having Carboxy, Ethoxycarbonyl, and Cyano Substituents at 5-Positions
Authors: Ishida Masaru , Tomohiro Shingo , Shimizu Minako , Inagaki Satoshi
Published: March 2006

Diels-Alder reactions of 1,2,3,4,5-pentamethylcyclopentadienes having carboxy, alkoxycarbonyl, and cyano substituents at 5-positions with N-phenylmaleimide preferentially afforded the corresponding syn-attack products with the ratio of syn/anti = 80 : 20 to 100 : 0, while the diene having 5-hydroxymethyl moiety gave the anti-attack product exclusively.
One-Dimensional Ferrimagnetic Chains with Weak Ferromagnetic Interchain Interaction in a 1 : 1 Manganese(II) Bis(hexafluoroacetylacetonate) Complex with Bis[3-tert-butyl-5-(N-oxy-tert-butylamino)phenyl] Nitroxide
Authors: Inoue Katsuya , Hayamizu Takashi , Iwamura Hiizu
Published: March 2006

Black block crystals of [Mn(hfac)2•1]n obtained from a solution of anhydrous manganese(II) bis(hexafluoroacetylacetonate) {Mn(hfac)2} and bis[3-tert-butyl-5-(N-oxy-tert-butylamino)-phenyl] nitroxide (1) in n-hexane/ether were found to have a one-dimensional chain structure by the coordination of the terminal nitroxide groups of 1 with two different Mn ions and undergo a transition into a spin-ordered state at 11 K.
In Situ Conductivity Measurements during Lithium Intercalation/Deintercalation on V2O5 Thin Film by Using Interdigitated Microarray Electrodes
Authors: Shibuya Mashio , Yamamura Satoru , Matsue Tomokazu , Uchida Isamu
Published: March 2006

The conductivity change of a vacuum deposited V2O5 thin film during lithium intercalation/deintercalation was investigated using an interdigitated microarray electrode. The conductivity-potential profile showed two peaks (ca. 1.7 × 10−3 S cm−1) at 3.23 V and 3.41 V vs. Li/Li+, corresponding to the peaks in the cyclic voltammogram for Li intercalation/deintercalation. The conductivity decreased below 10−5 S cm−1 when the potential was scanned to the region more negative than 3.0 V vs. Li/Li+ and an irreversible conductivity change was observed when the potential was scanned back.
Synthesis and Complexing Behavior of a New Fluorescent Ligand Using Interaction between Two Substituents
Authors: Tahara Ruriko , Hasebe Kiyoshi , Nakamura Hiroshi
Published: March 2006

A fluorescent reagent (1) which has an electron donor and an acceptor at each terminal of linear polyether chain was synthesized, and the complexation behavior of 1 with alkaline earth metal ions was investigated. Quenching of the fluorescence spectrum and changes of 1H-NMR spectrum at the complexation with the metal ions showed the interaction between two moieties in both excited state and ground state.
Control of Size of CdS Formed in Organized Molecular Assembly Films by Molecular Structure and Film Orderliness
Authors: Moriguchi Isamu , Shibata Futoshi , Teraoka Yasutake , Kagawa Shuichi
Published: March 2006

The size of quantized CdS formed in Langmuir-Blodgett (LB) films was precisely controlled by the occupied molecular area of amphiphile and the repetition number of the sulfidation-intercalation cycle, because the concentration of Cd2+ ions introduced in the hydrophilic interlayers was determined by these two factors. The size of CdS formed in the bilayer film was fairly larger than that in corresponding LB film, showing the influence of the orderliness of the matrix film on the formation of CdS in the hydrophilic interlayers.
An Enantioselective Synthesis of (11R,12S,13S,9Z,15Z)-9,12,13-Trihydroxyoctadeca-9,15-dienoic Acid, a Self-defensive Substance against Rice Blast Disease
Authors: Hatakeyama Susumi , Kojima Kennichiro , Fukuyama Hiroko , Irie Hiroshi
Published: March 2006

(11R,12S,13S,9Z,15Z)-9,12,13-Trihydroxyoctadeca-9,15-dienoic acid, a self-defensive substance against rice blast disease, has been synthesized in an enantiomerically pure form in 8% overall yield from (2E,5E)-1,2-dibenzyloxy-2,5-heptadien-4-ol.
Preparation and Characterization of Vanadyl Hydrogen Phosphate Hydrates; VO(HPO4)·1.5H2O and VO(HPO4)·0.5H2O
Authors: Matsuura Ikuya , Ishimura Tomohiro , Kimura Naomasa
Published: March 2006

A new phase of vanadyl(IV) hydrogen phosphate sesquihydrate, VO(HPO4)·1.5H2O, has been obtained by the reduction of VOPO4·2H2O with 1-butanol. The unit cell is the orthorhombic system with lattice constants a = 7.43 Å, b = 9.62 Å, and c = 7.97 Å. in space group Pmmn.
Novel Electron Donors for Organic Conductors. Benzo[c]thiophene-Extended Analogues of Methylene-, Ethylene-, and Propylenedithiotetrathiafulvalene
Authors: Takahashi Kazuko , Ise Toshihiro
Published: March 2006

Three alkylenedithio derivatives of 1,3-bis(1,3-dithiol-2-ylidene)-1,3-dihydrobenzo[c]thiophene (BDTBT) have been synthesized. These donors exhibited an electron-donating ability near to that of tetrathiafulvalene and afforded a very stable radical cation. The powdered tetracyanoquinodimethane complex of the methylenedithio derivative exhibited a fairly high room temperature conductivity of σ = 15 Scm−1 and a semiconducting behavior with a very low activation energy of Ea = 0.050 eV.
The Copper(I) Iodide-promoted Allylation of Vinylstannanes with Allylic Halides
Authors: Takeda Takeshi , Matsunaga Ko-ichi , Kabasawa Yuki , Fujiwara Tooru
Published: March 2006

The stereospecific allylation of vinylstannanes with allylic halides proceeded in the presence of copper(I) iodide in DMSO-THF at room temperature. The stereospecificity of the reaction was dependent on the structures of vinylstannanes and allylic halides, and also the leaving group of allylic halides employed. Concerning the regioselectivity regarding allylic system, higher α-regioselection was observed in the reactions of allylic chlorides than in those of the corresponding iodides.
Effect of Various Fluoride Atom Species of Activated Carbon in CF4 Plasma on Recovery of Trichloroethylene
Authors: Tanada Seiki , Nakamura Takeo , Kawasaki Naohito , Iwaki Akifumi , Torii Yasuhiro
Published: March 2006

The surface modification of activated carbon using low temperature plasma of tetrafluoromethane was investigated to evaluate the removal of trichloroethylene. The plasma-treated, activated carbon underwent an immersion water and/or heat-treatment. The adsorption isotherms of trichloroethylene onto the activated carbons were measured to elucidate the relationship between the adsorption behavior of trichloroethylene and the introduced fluoride atoms. The trichloroethylene adsorption sites on plasma-treated, activated carbon are related to the fluoride atom species of the adsorption type, that is, the ion type.
Determination of Association Constants for Cyclodextrin Inclusion Complexation by Pulse Radiolysis
Authors: Yamamoto Yukio , Naka Yukihiko , Yoshida Yoichi , Tagawa Seiichi
Published: March 2006

The association constants for the inclusion complexation of 4-biphenylcarboxylate and its analogs with β-cyclodextrin are determined by a pulse radiolysis method for the kinetic analysis of the one-electron reduction by the hydrated electron.
Determination of Dissolved Oxygen in Water Samples Using Capillary Electrophoresis
Authors: Razee Saeid , Tamura Atsushi , Masujima Tsutomu
Published: March 2006

Capillary electrophoresis was successfully applied for the determination of a gaseous analyte of interest i.e., dissolved oxygen in water samples, for the first time. Each analysis was performed within 5 min and as low as 50 ppb dissolved oxygen can be determined by this method. The proposed method was successfully applied for the analysis of river water. The method is versatile for analysis of miniaturized samples and studies of reaction kinetics.
An Asymmetric Synthesis of the Fully Functionalized AB Ring System of 12-Demethyltaxol via Successive Stereoselective Allylation and Intramolecular Aldol Reactions
Authors: Shiina Isamu , Iwadare Hayato , Saitoh Masahiro , Ohkawa Naoto , Nishimura Toshihiro , Mukaiyama Teruaki
Published: March 2006

Optically active 9-t-butyldiphenylsiloxy-11,11-dimethyl-5-methoxymethoxy-1,2,6-tribenzyloxybicyclo[5.3.1]undec-3,7-diene (12) was synthesized from diketone 9  via an intramolecular aldol reaction. The diketone 9 was synthesized from 7-t-butyldimethylsiloxy-4,8-dibenzyloxy-6,6-dimethyl-5-p-methoxy-benzyloxy-2-cycloocten-1-one (1) by way of a two-step sequence using diastereoselective allylation with allylmagnesium bromide followed by Wacker oxidation.
Homocereulide, an Extremely Potent Cytotoxic Depsipeptide from the Marine Bacterium Bacillus cereus
Authors: Wang Gui-Yang-Sheng , Kuramoto Makoto , Yamada Kaoru , Yazawa Kazunaga , Uemura Daisuke
Published: March 2006

Homocereulide (1) and cereulide (2), isolated from the marine bacterium Bacillus cereus SCRC, showed extremely potent cytotoxicity. Their structures were elucidated by spectroscopic analysis and chemical degradation.
Rate Enhancing Effect of Carbon Dioxide in the Reaction of Acetonitrile with Methanol to Acrylonitrile over Magnesium Oxide Catalyst
Authors: Lin Yi Wen , Ishii Makoto , Ueda Wataru , Morikawa Yutaka
Published: March 2006

Carbon dioxide greatly enhanced the formation rate of acrylonitrile in the gas-phase reaction of acetonitrile with methanol over magnesium oxide catalyst. The reaction in the presence of carbon dioxide was accompanied by the reaction of methanol with carbon dioxide to give carbon monoxide and water. An adsorbed carbon dioxide species on the basic surface of magnesium oxide seems to afford an active methanol-derived species for the reaction with acetonitrile.
Preparation of Polyphenol Particles by Dispersion Polymerization Using Enzyme as Catalyst
Authors: Uyama Hiroshi , Kurioka Hideharu , Kobayashi Shiro
Published: March 2006

Peroxidase-catalyzed dispersion polymerization of phenols has been performed in a mixture of 1,4-dioxane and phosphate buffer using a water-soluble polymer as stabilizer to produce relatively monodisperse polyphenol particles in the sub-micron range.
Syntheses of Novel Structurally Constrained (S)-Histidyl-(S)-Histidine Derivatives and Their Copper(II) Complexes
Authors: Kojima Yoshitane , Watanabe Masaaki , Seki Yoshio , Yamato Kazuhiro , Miyake Hiroyuki
Published: March 2006

A novel chelating reagent, N,N′-ethylene-bridged (S)-histidyl-(S)-histidine methyl ester, has been synthesized by a one-step reaction of a Schiff-base of (S)-histidine methyl ester with aqueous glyoxal and sodium cyanoborohydride. Cu(II) complexes of its derivatives also have been synthesized and characterized.
A New Mode of Fluoride-Ion Exchange Reactions between Tetracoordinate Silane and Pentacoordinate Fluorosilicate
Authors: Kira Mitsuo , Hoshi Takashi , Sakurai Hideki
Published: March 2006

Intramolecular fluoride-ion donor-acceptor systems such as [p- and m-(difluorophenylsilyl)phenyl]trifluorophenylsilicates showed a new mode of fluoride-ion exchange reactions in solution, for which a concerted bimolecular exchange mechanism through cyclophane-like transition states was proposed on the basis of a dynamic 13C NMR analysis of rates and activation parameters.
Alkylation of Phosphate Group of Nucleotides via Tributylstannyl Phosphate Derivatives
Authors: Ayukawa Hiroshi , Ohuchi Shokichi , Ishikawa Masahide , Hata Tsujiaki
Published: March 2006

Alkylation reaction of phosphates via tributylstannyl salt was applied to dinucleotide derivatives. Some alkyl groups were successfully introduced into the internucleotidic phosphate by use of alkyl bromides in the presence of tetraethylammonium bromide. In case of thymidylyl(3′-5′)thymidine, the phosphate moiety was alkylated selectively.
The Formation of Higher Linear Phosphates during Degradation Reactions of Di-, Tri- and Tetraphosphates in the Presence of Aluminum(III) Ion
Authors: Kura Genichiro , Ninomiya Junko
Published: March 2006

Linear phosphates which contain one more P atom in their molecules than the parent phosphates were found in the degradation products of the parent di-, tri- and tetraphosphate under the presence of aluminum(III) ions. These side reactions occurred only during the cleavage reactions of the linear polyphosphates.
Mg-Promoted Reductive Cross Coupling of Carbonyl Compounds with Trimethylsilyl Chloride
Authors: Ishino Yoshio , Maekawa Hirofumi , Takeuchi Hiroshi , Sukata Kazuaki , Nishiguchi Ikuzo
Published: March 2006

Mg-promoted cross-coupling of aromatic carbonyl compounds with trimethylsilyl chloride (TMSCl) in DMF at room temperature brought about reductive carbon-silicon bond formation to give the corresponding α-trimethylsilylalkyl trimethylsilyl ethers selectively in good yields. The reaction may be initiated through electron transfer from Mg metal to the carbonyl compounds.
Synthesis and Lithium Ion-Selectivity of 2-Phenylcyclohexano-and 2,3-Diphenylcyclohexano-14-crown-4 Derivatives
Authors: Kobiro Kazuya , Kaji Mayumi , Tsuzuki Sachiko , Tobe Yoshito , Tuchiya Yuko , Naemura Koichiro , Suzuki Koji
Published: March 2006

Cis- and trans-2-phenylcyclohexano-14-crown-4 and cis- and trans-2,3-diphenylcyclohexano-14-crown-4 were prepared and their ion selectivity was determined by means of extraction of alkali metal picrates, stability constants, and ion-selective electrodes. Cis diphenyl derivative exhibits the highest lithium ion-selectivity of the four ionophores examined, which is as high as that of decalino-14-crown-4, one of the best Li+-selective ionophores.
Rhodium and Ruthenium Complexes with Optically Active Chelate Cyclopentadienyl-Phosphine Bidentate Ligands
Authors: Kataoka Yasutaka , Saito Yoshinori , Nagata Koji , Kitamura Kenichi , Shibahara Atsushi , Tani Kazuhide
Published: March 2006

The first optically active cyclopentadienyl-phosphine bidentate ligands ([Cp-P]H ligands) in which a diphenylphosphino group and a cyclopentadienyl or an indenyl group are connected by an L-threitol derivative or an (S,S)-trans-1,2-dimethylenecyclo-pentane group have been prepared. The rhodium and ruthenium complexes of their anions have been prepared and characterized.
ESR of the Trianion and Anion Radicals of Benzo[g][1,2,5]thiadiazolo[3,4-b]-quinoxaline-5,10-dione and Its Selenium Analogue
Authors: Hirayama Masatoshi , Terasaka Toshitaka , Itasaka Manabu , Suzuki Takanori , Yamashita Yoshiro , Miyashi Tsutomu
Published: March 2006

The anion and trianion radicals of title compounds were generated by electrolysis in acetonitrile at room temperature and their ESR spectra were measured, which can be identified on the basis of π-MO calculations of hfsc’s.
Preparation of Transparent TiO2 Thin Film Photocatalyst and Its Photocatalytic Activity
Authors: Negishi Nobuaki , Iyoda Tomokazu , Hashimoto Kazuhito , Fujishima Akira
Published: March 2006

Transparent TiO2 thin films with high photocatalytic activity were prepared on glass substrates via the sol-gel method from tetraisopropyl titanium ethanol solution containing polyethylene glycol and diethylene glycol. Transparency of these TiO2 thin films was 80% in the visible region. Photocatalytic activity of the TiO2 thin films was studied using the decomposition of gaseous acetaldehyde. We found that the quantum yield with those films was similar to that with one of the most photoactive commercial TiO2 powders, Degussa P-25.
Design and Synthesis of Artificial Siderophores: Lysine-based Triscatecholate Ligands as a Model for Enterobactin
Authors: Akiyama Masayasu , Ikeda Tsuyoshi
Published: March 2006

An enantiomeric pair of triscatecholate ligands have been prepared as a model for siderophore enterobactin, using protected derivatives of l- or d-lysine, 1,2-diaminoethane and 2,3-dihydroxybenzoic acid. The ligands have greater chemical stability and higher water solubility than enterobactin, and form chiral complexes with iron(III), as enterobactin does.