bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and Photochemical Switching of the Antiferroelectric Liquid Crystals Containing a Diazenediyl Group
Authors: Negishi Makoto , Kanie Kiyoshi , Ikeda Tomiki , Hiyama Tamejiro
Published: March 2006

Photochromic antiferroelectric liquid crystals containing a diazene moiety were synthesized for the first time, and their photochemical switching behaviors were studied.
Hysteresis Curve Variations of MOS Capacitors Passivated by Ba(PO3)2-Al(PO3)3-B2O3 Glasses
Authors: Kobayashi Keiji
Published: March 2006

The purpose of this work is to clarify the relationship between some of the properties of MOS (metal, oxide, silicon) capacitors passivated by Ba(PO3)2-Al(PO3)3-B2O3 glasses and the hydroxyl contents of the glasses. When substitution of Al(PO3)3 for Ba(PO3)2 progressively decreased the OH− absorption intensity, the C-V (capacitance-voltage) curve shift, ΔVG in the MOS capacitors decreased.
Role of the Methoxy Substituents on the Photochromic Indolyfulgides. Absorption Maximum vs. Molar Absorption Coefficient of the Colored Form
Authors: Yokoyama Yasushi , Sagisaka Toshiya , Mizuno Yukitami , Yokoyama Yayoi
Published: March 2006

While the introduction of a methoxy group to C-5 of the indole ring of the indolylfulgide caused a large bathochromic shift of the absorption maximum of its colored form, introduction of a methoxy group to C-6 resulted in enlargement of the molar absorption coefficient of the colored form. The 5,6-dimethoxy-substituted indolylfulgide has both properties.
Synthesis of Xylitol by Reduction of Xylulose with the Combination of Hydrogenase and Xylulose Reductase
Authors: Hasumi Fumihiko , Teshima Chitoku , Okura Ichiro
Published: March 2006

Xylitol synthesis by reduction of xylulose was performed by the combination of NADH regeneration system and xylulose reductase. The conversion of xylulose to xylitol was 98% after 34 h and the turnover number of NAD was 1017.
Unprecedentedly Fast DNA Hydrolysis by the Synergism of the Cerium(IV)-Praseodymium(III) and the Cerium(IV)-Neodymium(III) Combinations
Authors: Takeda Naoya , Imai Takamitsu , Irisawa Makoto , Sumaoka Jun , Yashiro Morio , Shigekawa Hidemi , Komiyama Makoto
Published: March 2006

The most active catalysts for DNA hydrolysis so far have been obtained by using the synergetic cooperation of the cerium(IV) ion with the praseodymium(III) ion. The pseudo first-order rate constant for the hydrolysis of thymidylyl(3′-5′)thymidine by the 2:1 combination is 10 times as great as that by the cerium(IV) ion.
Transfer Kinetics of Amphiphilic Porphyrin between Organic Phase and Water Phase
Authors: Mizutani Tadashi , Tobisawa Akihiko , Ogoshi Hisanobu
Published: March 2006

Amphiphilic prophyrins having a poly(ethylene oxide) chain were prepared. The transfer rates of the amphiphilic porphyrin from benzene to water were biphasic and were accelerated by lowering temperature or by the addition of SDS. Kinetic data suggest that (1) conformational changes of the amphiphilic prophyrin to a polar form give rise to the faster rate at low temperature, and (2) adsorption to the interface leads to the biphasic kinetics.
The Effect of High Magnetic Field on the Crystal Growth of Benzophenone
Authors: Katsuki Akio , Tokunaga Ryoko , Watanabe Shin-ichi , Tanimoto Yoshifumi
Published: March 2006

The crystal growth of benzophenone was observed under high magnetic fields. In the presence of a magnetic field (8 T) the benzophenone crystal, which was diamagnetic, aligned in such a way that its crystal c-axis was perpendicular to the direction of the magnetic field. This phenomenon seemed attributable to the anisotropic diamagnetic susceptibility of the crystal.
Novel Reaction of Selenobenzophenones with Alkyllithiums Leading to Symmetrical Olefins
Authors: Okuma Kentaro , Koda Gen , Okumura Seiji , Ohno Atsuyoshi
Published: March 2006

The reaction of selenobenzophenones with alkyllithiums or Grignard Reagents exclusively affords symmetrical tetraarylethylenes as selenophilic products. The reaction might proceed through episelenide (selenirane) intermediates.
Enantioselective Electrodialysis of N-α-Acetyltryptophans through Molecularly Imprinted Ploymeric Membranes
Authors: Yoshikawa Masakazu , Izumi Jun-ichiro , Kitao Toshio
Published: March 2006

Molecularly imprinted polymeric membranes, bearing tetrapeptide derivative H-Asp(OcHex)-Ile-Asp(OcHex)-Glu(OBzl)-CH2-, recognized N-α-acetyl-l-tryptophan from recemic N-α-acetyltryptophans. Electrodialysis of racemic N-α-acetyltryptophans gave permselectivity toward l-isomer, reflecting adsorption selectivity.
Selective Permeation of Carbon Dioxide through Amine-modified Polyimide Membranes
Authors: Okamoto Ken-ichi , Yasugi Norimitsu , Kawabata Takashi , Tanaka Kazuhiro , Kita Hidetoshi
Published: March 2006

Amine-modified polyimide membranes were prepared by immersing methyl-brominated polyimide membranes into aqueous amine solutions. They displayed high performance for CO2/N2 separation especially in the presence of water vapor; for example, permeability to CO2 of 36 Barrer and separation factor of 81 at 2 atm, 298 K and relative humidity of 75%.
Generation of Superoxide by Adding Polyaniline to Water
Authors: Otsuka Shigeru , Saito Kiyoshi , Morita Ken-ichi
Published: March 2006

When polyaniline powder was added to water superoxide generated. The formation of superoxide was confirmed by using ESR, amperometry and enzyme techniques.
Fluorescence Spectrophotometric Determination of Ca2+ and Ba2+ Based on 1, n-Bis(1-naphthylcarboxy)oxaalkanes
Authors: Kawakami Jun , Komai Yuko , Ito Shoei
Published: March 2006

1,n -Bis(1-naphthylcarboxy)oxaalkanes (1NPnN, n = 1, 2, 3, 4, 5, 6) as fluorescent sensors by excimer emission for metal ions were synthesized, and the complexation of 1NPnN with alkali and alkaline earth metal ions in acetonitrile was investigated. Alkaline earth metal cations suppress or enhance the fluorescence remarkably, depending on the cation size and the length of polyether chain.
Triple-Decker Sandwich Structure of a New Rubidium(I) Tetraimino Macrocyclic Complex
Authors: Ito Mitsuru , Sato Tadanobu , Sakai Ken , Tsubomura Taro
Published: March 2006

A new triple-decker type rubidium(I) complex containing 18-membered macrocyclic ligands has been synthesized and characterized by X-ray crystallography. Linear stacks of the triple-decker units have been revealed in the crystal.
Facile New Method for Preparation of Optically Active Protected Proline
Authors: Yamaguchi Jun-ichi , Ueki Masaaki
Published: March 2006

Treatment of l-N-protected 2-amino-5-bromopentanoic acid ester, which was prepared from protected l-glutamic acid, with sodium hydride in tetrahydrofuran (THF) proceeded to give the corresponding protected l-proline in high yield. On the other hand, the reaction of 2-aminobutyric acid derivative with sodium hydride gave the 1-aminocyclopropane-1-carboxylic acid derivative.
The ESR Investigation of Brownish Ring at the Surface of Quartz Crucible Used for Cz-Si Crystal Growth
Authors: Watanabe Kohji , Tanaka Koki , Hasebe Masami
Published: March 2006

An ESR spectrum was observed for brownish rings formed at the surface of quartz crucible used in Cz-Si crystal growth. A signal assignable to the E′-center has been detected in the brownish ring. This result is explained by the dissolution of oxygen atoms of vitreous quartz crucible into liquid silicon.
Assignment of the 2177 cm−1 Absorption Band Appearing upon Admission of CO on a Copper Ion-exchanged MFI Zeolite
Authors: Hoshino Yasuyuki , Iwamoto Masakazu
Published: March 2006

The titled absorption band was attributable to νsym of a dicarbonyl species adsorbed on a Cu+ ion. The monocarbonyl species at 2158 cm−1 and the dicarbonyl species at 2177 and 2151 cm−1 have reversibly changed each other dependent on the partial pressure of CO.
Preference of the Mesolytic Cleavage over the Nuclear Substitution Observed in the Ozone-mediated Nitration of Bicumene with Nitrogen Dioxide. Implication to the Electron Transfer Nature of the Kyodai-Nitration of Arenes
Authors: Suzuki Hitomi , Mori Tadashi
Published: March 2006

Ozone-mediated reaction of bicumene with nitrogen dioxide in dichloromethane at low temperature results in almost complete mesolytic cleavage of the hydrocarbon, accompanied by little or no nuclear nitration, in accordance with operation of the electron transfer process involving the nitrogen trioxide as initial electrophile.
Fabrication of Porous Silicon-based All-solid State Multicolor EL Device with Hole Injecting Film Formed by Electropolymerization
Authors: Osaka Tetsuya , Ogasawara Kako , Okumura Takehumi , Komaba Shinichi
Published: March 2006

By using electrolpolymerized poly(N-vinylcarbazole) (PVCz) as a hole injecting film on porous n-silicon (PS), an all-solid state multicolor EL device on the basis of PS was able to be fabricated. The electroluminescence (EL) from the PVCz/PS device under forward bias was enhanced as compared with the device without PVCz film. An EL peak-shift of this device was observed with an increase in applied forward bias.
Mechanism for Photodecomposition of 4,8,10-Trithiadibenzo[cd,ij]azulene 8-oxides
Authors: Fujii Takayoshi , Kusanagi Hiroki , Furukawa Naomichi
Published: March 2006

4,8,10-Trithiadibenzo[cd,ij]azulene 8-oxides were prepared and their photolysis provided a convenient procedure to yield the corresponding aldehydes and ketones together with 4,8,9-trithiacyclopenta[def]phenanthrene.
Solvent-Dependent cis-trans One-Way Photoisomerization of Bisformyl-Substituted 1,6-Diphenyl-1,3,5-hexatriene
Authors: Sonoda Yoriko , Suzuki Yasuzo
Published: March 2006

trans,trans,trans-1,6-Bis(p-formylphenyl)-1,3,5-hexatriene underwent stereoselective photoisomerization to give its cis,trans,trans isomer regardless of the solvent polarity. Quantum yields of trans,trans,trans-to-cis,trans,trans isomerization decreased dramatically with decreasing solvent polarity, whereas those of the reverse reaction gradually increased. This led to the cis,trans,trans-to-trans,trans,trans ‘one-way’ isomerization in nonpolar solvents.
Liquid-Junction Potential Dependence of the Electron Transfer Rate across a Single-Microdroplet/Water Interface
Authors: Chikama Katsumi , Nakatani Kiyoharu , Kitamura Noboru
Published: March 2006

An electron transfer (ET) reaction between ferrocene in a single oil droplet and hexacyanoferrate (III) in the surrounding water phase was investigated by laser trapping, spectroscopic, and electrochemical techniques. A droplet-size dependence of the ET reaction was studied as a function of a Galvani potential difference (Δ0WΦ) between the droplet and water phases. The ET rate was shown to be highly dependent on Δ0WΦ.
1,5-Ph3Ge and 1,6-Bu3Sn Group Transfer from Enoxy Oxygen to Alkoxy Oxygen
Authors: Kim Sunggak , Do Jung Yun , Lim Kwang Min
Published: March 2006

1,5-Ph3Ge and 1,6-Bu3Sn group transfer from enoxy oxygen to alkoxy oxygen are observed in radical reaction of keto epoxides and keto oxetanes, respectively.
Diastereoselective Reduction of Hemiacetals Derived from 2,3-O-Isopropylidene Derivatives of Carbohydrate Lactones
Authors: Jiang Shende , Singh Gurdial , Wightman Richard H
Published: March 2006

Reactions of organomagnesium and/or organolithium reagents with 2,3-O-isopropylidene-d-erythronolactone and 5-O-tert-butyldiphenylsily1-2,3-O-isopropylidene-d-ribonolactone gave good yields of the corresponding hemiacetals which, by choice of hydride reagents, can be reduced stereoselectively to give products with a syn-(threo-) relationship between the new chiral centre and that at C-2 of the lactone.
Highly Z Selective Synthesis of Functionalized Monoterpenoids via N-Ylide [2,3]Sigmatropic Rearrangement and Its Application to 13-cis-Retinol
Authors: Honda Kiyoshi , Yoshii Ichiro , Inoue Seiichi
Published: March 2006

Highly stereoselective elongation of a functionalized E isoprene unit on the Z terminal methyl of prenol was achieved by the N-ylide rearrangement of N-tiglyl-β-methallyldimethyl ammonium salt. (E,Z)-Rearrangement product was converted into 13-cis-retinol via useful conjugated triene isoprenoid synthon.
Magnetic Field Effects on the Current Oscillations in Anodic Zinc Dissolution
Authors: Mogi Iwao , Kikuya Hiroshi , Watanabe Kazuo , Awaji Satoshi , Motokawa Mitsuhiro
Published: March 2006

In order to investigate the magnetic field effects on chemical feedback systems, the oscillation behavior of the anodic currents of a zinc electrode was studied in an 8 mol dm−3 NaOH aqueous solution under magnetic fields using a liquid-helium-free large-bore superconducting magnet.
Synthesis and Property of Planar-chiral Cyclopentadienyl-ruthenium Complexes
Authors: Komatsuzaki Nobuko , Uno Mitsunari , Kikuchi Hidetoshi , Takahashi Shigetoshi
Published: March 2006

The first enantiomerically pure planar-chiral cyclopentadienyl-ruthenium complexes, [CpnRu(benzene)]PF6, were synthesized (CpnH; unsymmetricaly trisubstituted cyclopentadiene), and by a photo reaction with CH3CN converted to [CpnRu(CH3CN)3]PF6, which was transformed into planar-chiral [CpnRu(arene)]PF6 by a ligand exchange reaction.
Light Emitting Properties of Linear π-Conjugated Poly(arylene)s
Authors: Yamamoto Takakazu , Lee Bang-Lin , Saitoh Yutaka , Inoue Tetsushi
Published: March 2006

Dichroism of photoluminescence PL of linear poly(2,3-di-p-tolylquinoxaline-5,8-diyl) indicates that the PL has a transition moment along the direction of the polymer main chain and an energy transfer takes place in the polymer. Poly(phenanthroline-3,8-diyl) and poly(pyridine-2,5-diyl) give analogous results and show a strong tendency to give excimer-type emission in both PL and electroluminescence.
Absorption of Uric Acid Derivatives in Water by Poly(vinyldiaminotriazine) through Hydrogen Bonding
Authors: Asanuma Hiroyuki , Gotoh Sumie , Ban Takeshi , Komiyama Makoto
Published: March 2006

In aqueous solutions, poly(2-vinyl-4,6-diamino-1,3,5-triazine) efficiently absorbs uric acid, xanthine, and theobromine by using three complementary hydrogen bonds. The adsorption is selective and reversible, indicating a strong potentiality for the practical application.
Synchronized Fluorine Exchange with Ring Inversion of Pentafluoro-1,4,-disilacyclohexane Anion
Authors: Hoshi Takashi , Takahashi Masae , Kira Mitsuo
Published: March 2006

A new intramolecular fluoride-ion donor-acceptor system, pentafluoro-1,4-disilacyclohexane anion showed an unusually rapid intramolecular intersilicon fluoride-ion exchange synchronized with ring inversion.
Hydrolysis of Nucleotides Using Actinoid Metal Ion
Authors: Ihara Toshihiro , Shimura Hitoshi , Ohmori Kazuhiro , Tsuji Hiroshi , Takeuchi Jun , Takagi Makoto
Published: March 2006

Hydrolysis of phosphomonoester and phosphodiester bonds of dpC, dCp, and dCpC were markedly accelerated in the presence of Th4+ in acidic (pH 4 and 5) aqueous solution; this effect surpassed those of other metal ions that were hitherto known as metals having catalytic activity for organic phosphoester (Ce3+, La3+, Cu2+).
Efficient TiO2 Powder and Film Photocatalysts with Rutile Crystal Structure
Authors: Sopyan Iis , Watanabe Mitsuru , Murasawa Sadao , Hashimoto Kazuhito , Fujishima Akira
Published: March 2006

Efficient TiO2 powder and film photocatalysts with the rutile structure were prepared. Their photocatalytic properties were assessed by measuring the photooxidative decomposition of gaseous acetaldehyde. The rutile powder showed much higher photoactivity than Degussa P-25 powder, both in degradation rate and in quantum efficiency. Moreover, the rutile film prepared by sintering the rutile sol at 450 °C also showed rather high photocatalytic activity.
Palladium-Catalyzed Dehalogenative Germylation of Allylic Halides with Triethlygermyltributylstannane at Room Temperature
Authors: Nakano Taichi , Ono Kazuyoshi , Migita Toshihiko
Published: March 2006

Triethlygermyltributylstannane was found to react with allylic halides at room temperature in the presence of a catalytic amount of Pd2(dba)3CHCl3 to bring about regioselective dehalogenative germylation giving 2-alkenyltriethylgermanes in good yields. Using triphenylphosphine as a ligand of the palladium caused to slow the rate of the present reaction.
Photochromic Behavior in the Molecular Glass of 4,4′,4″-Tris(3-methylphenylphenylamino)triphenylamine
Authors: Nakano Hideyuki , Akamatsu Keiichi , Moriwaki Kazuyuki , Shirota Yasuhiko
Published: March 2006

For the purpose of gaining information on the microstructure of molecular glasses, photochromic behavior of 4-dimethylaminoazobenzene (DAAB) in the molecular glass of 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) was studied in comparison with that in a polystyrene matrix and in a benzene solution. The results strongly suggest that the local free volume in the molecular glass of m-MTDATA is smaller than that in the polystyrene glass.
Methylene Insertion Reactions of Samarium Carbenoids into Boron–Hydrogen and Phosphorus–Hydrogen Bonds
Authors: Imamoto Tsuneo , Yamanoi Yoshinori
Published: March 2006

A samarium carbenoid, generated from diiodomethane and samarium metal, reacts with phosphine–boranes to afford phosphine–monomethylborane in good yields. The P–H bonds of secondary phosphine–boranes or secondary phosphine oxides are subjected to methylene insertion with the same carbenoid to give the corresponding P-methylated derivatives.
A New One-Step Synthesis of Functionalized Fulvenes
Authors: Himeda Yuichiro , Ueda Ikuo , Hatanaka Minoru
Published: March 2006

Functionalized Fulvenes were prepared in a single operation by condensation of allylidenetriphenylphosphoranes and 1,2-diacylacetylenes.
Catalytic Effect of Ag+ in Colloidal CdS-Induced Photooxidation of Aniline
Authors: Kumar Anil , Kumar Sanjay
Published: March 2006

The efficiency of colloidal CdS-induced oxidation of aniline is enhanced by doping Ag+. The luminescence of CdS particles containing low Ag+ is quenched by added aniline. At high concentrations of Ag+ (≥10%) no quenching of emission is observed. It is understood by the formation of Ag2S phase on the surface of CdS particles which prevents photogenerated holes to interact with the adsorbed aniline. The catalytic action of Ag+ is attributed to the efficient charge transfer at CdS-Ag2S interface upon irradiation to the adsorbed redox species.
In situ UV-visible Spectral Detection of a Molybdenum Dioxygen Porphyrin Complex Formed in the Solid State Process
Authors: Osada Mai , Tachibana Junichi , Imamura Taira , Sasaki Yoichi
Published: March 2006

Reversible dioxygenation reaction of a molybdenum(IV) porphyrin, MoIVO(tmp), in the solid state with dioxygen, was confirmed directly by in-situ UV-vis spectral measurements.
A Raman Spectroscopic Study of Merocyanine Aggregates of a 15N-Isotopomer of 6-Nitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indoline]. A Direct Evidence for the Association through the NO2-Bridges
Authors: Sato Hiroyasu , Matsuzaki Akiyoshi , Nishio Satoru , Yoshimi Motohiro , Yamamoto Katsutoshi , Tomioka Hideo
Published: March 2006

A Raman spectroscopic study on large-sized merocyanine aggregates prepared by the irradiating a 15NO2-isotopomer of 6-nitro-1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indoline] (6-nitro BIPS) with UV light in a cyclohexane solution strongly indicates the association of merocyanine monomers through the NO2-bridges.
Uniformly Sized Polymer Based Stationary Phase Having Multi-Chiral Selectors
Authors: Yoshizako Kimihiro , Shirasu Yuichi , Hosoya Ken , Kimata Kazuhiro , Araki Takeo , Tanaka Nobuo
Published: March 2006

Uniformly sized polymer based HPLC stationary phase having multi-chiral selectors was prepared through a combination of molecular imprinting technique and in situ surface modification technique. Interestingly, a simple additivity of chiral recognition abilities of each chiral selectors was observed. Size exclusion chromatography revealed a possible cause for the selectivity.
Heterogeneous Catalysis of the Friedel-Crafts Alkylation by Doped Natural Phosphate and Tricalcium Phosphate
Authors: Sebti Saïd , Rhihil Abdallah , Saber Ahmed
Published: March 2006

Catatytic behavior has been observed for tricalcium phosphate and either copper or zinc chloride doped natural phosphate for the Friedel-Crafts reaction. Monoalkylation has been quantitatively achieved with high selectivity.
The Volume and Compressibility Changes Associated with Protein Denaturation
Authors: Hayashi Tomohiro , Sakurai Masao , Nitta Katsutoshi
Published: March 2006

The changes in the apparent specific volume and apparent specific adiabatic compressibility associated with thermal and chemical denaturations were studied for hen egg white lysozyme solution. No transition was found in the temperature dependence of the apparent quantities, whereas the addition of a certain amount of guanidine hydrochloride seems to decrease slightly the volume and compressibility.
Stereoselective Addition of Alcohol to Acetylenecarboxylate Catalyzed by Silver(I) Salt
Authors: Kataoka Yasutaka , Matsumoto Osamu , Tani Kazuhide
Published: March 2006

A silver(I) salt catalyzed the stereoselective trans addition of alcohol to dimethyl acetylenedicarboxylate smoothly under mild conditions to afford dimethyl methoxyfumarate in a quantitative yield.
Electrochemical Characterization an Assembled Monolayer of α-Methoxy-ω-mercapto-poly(ethylene glycol) on Gold and Complex Formation of the Monolayer with α-Cyclodextrin
Authors: Nakashima Naotoshi , Miyata Yujiro , Tominaga Masato
Published: March 2006

Assembled monolayers of α-methoxy-ω-mercapto-poly(ethylene glycol) on gold were found to provide unique microenvironments for the electrochemistry of small molecules and a heme protein and to form a two-dimensional supramolecular complex with α-CD on the metal electrode surfaces.
Synthesis of GLA-60 Positional Isomer as an LPS-Agonist and Its Activity
Authors: Shiozaki Masao , Arai Masami , Macindoe Wallace M , Mochizuki Takashi , Kurakata Shin-ichi , Maeda Hiroaki , Nishijima Masahiro
Published: March 2006

Compound 10 was synthesized from β-d-glucose pentaacetate in a stereocontrolled manner. It unexpectedly showed LPS-agonistic activity much stronger than that of GLA-60 toward human monoblastic U937 cells in the TNFα production.
Enantioselective Borohydride Reduction of Ketones Catalyzed by Optically Active Cobalt(II) Complexes: Achievement of High Enantioselection by Modified Borohydrides with Furfuryl Alcohol Derivatives
Authors: Sugi Kiyoaki D , Nagata Takushi , Yamada Tohru , Mukaiyama Teruaki
Published: March 2006

The enantioselective borohydride reduction of ketones catalyzed by optically active (β-oxoaldiminato) cobalt(II) complexes was remarkably improved by using the borohydride which was modified with furfuryl alcohol dervatives and ethanol. In the presence of 1 mol% of the above complex catalysts, asymmetric reduction of aromatic ketones proceeded smoothly to give the corresponding optically active alcohols in quantitative yields within 6–12 h with high enantiomeric excesses (90–97% ee).
Isoplagiochins C and D, New Type of Macrocyclic Bis(bibenzyls), Having Two Biphenyl Linkages from the Liverwort Plagiochila fruticosa
Authors: Hashimoto Toshihiro , Kanayama Shigeru , Kan Yukiko , Tori Motoo , Asakawa Yoshinori
Published: March 2006

Two new type of macrocyclic bis(bibenzyls) named isoplagiochins C (1) and D (2) have been isolated from the liverwort Plagiochila fruticosa, and their structures established by a combination of two dimension NMR spectra and chemical degradation.
Stepwise Elongation of a Trinuclear Ruthenium Unit in Pyrazine-Bridged Linear Oligomers with Use of [Ru3(μ3-O)(μ-CH3COO)6(pyridine)(CO)(H2O)]
Authors: Kido Hiroaki , Nagino Haruko , Ito Tasuku
Published: March 2006

The synthetic method for the stepwise Ru3 unit elongation of pyrazine-bridged linear oligomer of trinuclear ruthenium complex with the Ru3(μ3-O)(μ-CH3COO)6 core has been developed, using a newly designed [Ru3(μ3-O)(μ-CH3COO)6(py)(CO)(H2O)] (py = pyridine) with labile and photoactive sites.
A Versatile Cycloaddition for the Generation of Pyrrolidine Derivatives via C–N–C 1,3-Dipoles
Authors: Torii Sigeru , Okumoto Hiroshi , Genba Akiko
Published: March 2006

The condensation of N-(trimethylsilylmethyl)benzylamine and aldehydes spontaneously gave azomethine ylides, which react with electron deficient olefins to yield cycloadducts under mild conditions.
Characterization of CeO2 Ultrafine Particles Prepared Using a Thermal Relaxation Technique
Authors: Masui Toshiyuki , Machida Ken-ichi , Sakata Takao , Mori Hirotaro , Adachi Gin-ya
Published: March 2006

Cerium(IV) oxide ultrafine particles were prepared in a nylon 11 matrix through a relaxative auto-dispersion (RAD) process. High-resolution electron microscope (HREM) observations revealed that the lattice parameter and mean particle size of CeO2 ultrafine particles were 0.541 nm and 4.1 nm, respectively.
Efficient Photogeneration of Oxidizing (Compound II-like) Species of Semisynthetic Myoglobin Appending Ruthenium Tris(2,2′-bipyridine)
Authors: Hamachi Itaru , Tsukiji Shinya , Tanaka Shigeaki , Shinkai Seiji
Published: March 2006

An efficient photogeneration method for an oxidizing active species of semisynthetic myoglobin bearing ruthenium tris(2,2′-bipyridine) (Ru(bpy)3) through intramolecular electron abstraction is described.
A Molecular Antiferromagnet TMTSF·FeCl4
Authors: Kumai Reiji , Asamitsu Atsushi , Tokura Yoshinori
Published: March 2006

A semiconducting organic radical cation salt with a magnetic anion, TMTSF·FeCl4 (ρrt = 40 Ωcm), was prepared. The crystal undergoes an antiferromagnetic ordering below TN = 4 K with the easy axis perpendicular to the TMTSF stacking direction. X-ray crystallographic analysis reveals that Cl atoms of the anions closely contact with Se atoms of the donor molecules and suggests that the spin ordering is mediated by magnetic interaction between donors and anions.
Synthesis of Binuclear Palladium(II) Complexes of Bidentate N(21),N(22)-Bridged Porphyrins
Authors: Takao Yuko , Takeda Tokuji , Miyashita Keiko , Setsune Jun-ichiro
Published: March 2006

N(21),N(22)-(etheno)-bridged porphyrins were metallated with PdCl2 to give binuclear porphyrin complexes with (μ-dichloro)dipalladium(II) structure in which the terminal PdCl2 moiety is coming close to the porphyrin plane.
Far-Wing Excitation Spectra of the Hg 6s6p 3P0 – 6s7s 3S1 Inter-Excited-State Transitions Broadened by Ar and Ne
Authors: Ohmori Kenji , Amano Kazuhiro , Okunishi Misaki , Chiba Hisashi , Ueda Kiyoshi , Sato Yukinori
Published: March 2006

We have measured the laser-excitation spectra of the Hg–Ar and Hg–Ne collisional quasimolecules in the far wings of the Hg 6s6p 3P0 – 6s7s 3S1 inter-excited-state transitions broadened by Ar and Ne. The simulation of the spectrum, based on an uniform-semiclassical treatment for the free-free Franck-Condon factor, has been carried out for the Hg–Ar system in order to estimate the potential curves for the E31 and a  30− states of the quasimolecule.
Synthesis and Crystal Structures of Thiolate-Bridged Diruthenium Complexes Containing Two Olefinic Ligands
Authors: Qü Jing-Ping , Matsuzaka Hiroyuki , Ishii Youichi , Hidai Masanobu
Published: March 2006

A series of thiolate-bridged dinuclear ruthenium complexes containing two electron-deficient olefinic ligands [Cp*Ru(μ-SR)2(η2-C2H3R′)2RuCp*] (R = Pri, Et, 2,6-C6H3Me2 or 2,4,6-C6H2Me3; R′ = CN, COOMe or CHO) have been synthesized from Ru(II)-Ru(II), Ru(II)-Ru(III) and/or Ru(III)-Ru(III) precursors, three of which have been characterized by X-ray structural analysis.
Circular Dichroism of an Aromatic Guest Induced by a Chiral Steroid Cyclophane in Aqueous Solution and Synthetic Bilayer Membrane
Authors: Kikuchi Jun-ichi , Ogata Toshiyuki , Inada Masahiko , Murakami Yukito
Published: March 2006

A steroid cyclophane, having l-lysine residues interposed between a tetraaza[6.1.6.1]paracyclophane skeleton and four cholate moieties, furnished a chiral binding site for a hydrophobic aromatic guest in a synthetic bilayer membrane as well as in aqueous solution, as evidenced by induced circular dichroism.
Enhanced Luminescence of Eu(III) by La(III), Gd(III), Tb(III) and Y(III) in Langmuir-Blodgett Films of Mixed Rare Earth Complexes
Authors: Zhong Guolun , Feng Yu , Yang Kongzhang , Zhu Guiyun
Published: March 2006

Four kinds of LB films containing 0.5%Eu(TTA)3Phen + 99.5%RE(TTA)3Phen (in molar percentage; RE = La(III), Gd(III), Tb(III) and Y(III)) mixed with arachidic acid (AA) in molar ratio of 1:1 were fabricated. The luminescent enhancement effect of RE(TTA)3Phen on Eu(III) was studied. The influence of rare earth ions on the efficiency of the intermolecular energy transfer in films was discussed. When the complexes of Tb(III) and Gd(III) coexist with Eu(TTA)3Phen, the efficiency of energy transfer is higher than that of the complexes of La(III) and Y(III).
Discrimination of Albumin and Lysozyme-Adsorption Characteristics on Two Differently-Originated Apatites
Authors: Akazawa Toshiyuki , Kobayashi Masayoshi , Kanno Tohru , Kodaira Kohei
Published: March 2006

Two kinds of hydroxyapatite (HAp) originated from cattle bones and reagents displayed different adsorption behavior of albumin on the C-sites and lysozyme on the P-sites of the HAp surface, which was strongly influenced by the basic strength of the C-sites and the acid strength of the P-sites as well as the total amount or surface proportion of the two sites, depending on the heat-treatment temperature of the HAp’s.
Design, Synthesis, and Electrochemical Behavior of New Electronic Systems Involving σ,σ- and σ,π-Interaction
Authors: Nishiwaki Keiji , Yoshida Jun-ichi
Published: March 2006

1,2-Bis(trimethylsilyl)-1,2-diphenylethane and its homologues were synthesized and the studies on their electochemical behavior revealed that there is definite interaction between the σ,π-interaction system (the C-Si bonds and the benzene rings) and the σ,σ-interaction system (the neighboring C-Si bonds) which causes significant decrease of the oxidation potentials.
Irreversible Inactivation of Serine Proteases by Peptidyl α,β-Unsaturated Nitro Compounds
Authors: Ohba Tsuyoshi , Takei Hisashi
Published: March 2006

Peptidyl α,β-unsaturated nitro compounds were found to be active-site directed irreversible inhibitors of serine protease, α-chymotrypsin. The inactivation was selective because tripeptidyl derivative 4 did not show any irreversible inhibitory activity toward another serine protease, procine pancreatic elastase.
Trityl Salt Catalyzed Stereoselective Glycosylation of Alcohols with 1-Hydroxyribofuranose
Authors: Uchiro Hiromi , Mukaiyama Teruaki
Published: March 2006

In the presence of a catalytic amount of several trityl salts, 2,3,5-tri-O-benzyl-d-ribofuranose smoothly reacted with alcohols to give various β-ribofuranosides in high yields with high stereoselectivity while reversed stereoselectivity was observed in the coexistence of lithium perchlolate.
Tetrabutylammonium Fluoride Promoted Regiospecific Reactions of Trimethylsilyl-o-Carborane with Aldehydes
Authors: Cai Jianping , Nemoto Hisao , Nakamura Hiroyuki , Singaram Bakthan , Yamamoto Yoshinori
Published: March 2006

Trimethylsilyl-o-carborane serves as o-carborane carbanion upon fluoride ion promoted reaction with carbonyl compounds. Thus, in the presence of tetrabutylammonium fluoride, trimethylsilyl-o-carborane undergoes facile, unprecedented, carbodesilylation with aromatic and aliphatic aldehydes.
Strand Ligation in a Double-stranded DNA by T4 RNA Ligase
Authors: Kinoshita Yasunori , Nishigaki Koichi , Husimi Yuzuru
Published: March 2006

T4 RNA ligase was shown to ligate two DNA strands contained in a double helix with a high efficiency. Experiments on substrate and temperature dependence of this reaction supported that single-stranded ends clamped by a double-stranded region are necessary for this reaction. This finding is widely useful for DNA joining.
A Cyclodextrin Derivative with Cation Carrying Ability: Heptakis(3,6-anhydro)-β-cyclodextrin 2-O-p-Phenylazobenzoate
Authors: Yamamura Hatsuo , Kawai Hirotake , Yotsuya Tadahiro , Higuchi Tamotsu , Butsugan Yasuo , Araki Shuki , Kawai Masao , Fujita Kahee
Published: March 2006

A cation-complexing host, heptakis(3,6-anhydro)-β-cyclodextrin, was converted to a mono-p-phenylazobenzoyl derivative, which exhibited alkali metal-carrying ability in CH2Cl2-H2O system.
Metal-induced Aggregation-deaggregation Equilibrium Change in Calix[4]arene-appended Bisfullerenes
Authors: Ikeda Atsushi , Shinkai Seiji
Published: March 2006

A calix[4]aryl ester containing two C60 groups changed the absorption spectra (and thus its visible color) upon changing the solvent from chloroform to chloroform : acetonitrile = 1 : 1 v/v or adding NaClO4. The spectroscopic and light-scattering studies established that the unique behaviors can be rationalized in terms of an aggregation-deaggregation equilibrium change.
Formation and 1H NMR Spectra of Low Spin Ferric Porphyrin Radical Cations with Orientationally Fixed Imidazole Ligands
Authors: Nakamura Mikio , Kawasaki Yumiko
Published: March 2006

Chemical oxidation of tetradurylporphyrinatoiron(III) chloride followed by the addition of 2-methylimidazole at −78 °C gave the first example of the low spin ferric porphyrin radical cation with orienta ionally fixed imidazole ligands, [Fe(TDP•)(2-MeIm)2]2+. The degree of asymmetric spin distribution on the pyrrole β carbons in the radical cation was estimated to be close to that in the starting low spin complex, [Fe(TDP)(2-MeIm)2]+, which was ascribed to the orthogonality of porphyrin a2u with imidazole π orbitals.
Secretion of 112 kDa Phosphatase from the Cultured Suspension Cells of Liverworts
Authors: Nishizaki Ayako , Satake Atushi , Chen Li , Izumi Shunsuke , Hirata Toshifumi
Published: March 2006

A phosphatase (homodimer of 56 kDa subunits) having a hydrolyzing activity toward p-nitrophenyl dihydrogenphosphate and phosphohistone was found to be secreted from cultured suspension cells of Marchantia polymorpha into their culture medium. Such secretion of the phosphatase was promoted by addition of bornyl acetate into the culture medium.
Photochemical Desulfurization of a Sulfinato-S-Cobalt(III) Complex. Formation of an Organic Peroxide Complex
Authors: Akhter Farooque MD , Kojima Masaaki , Nakajima Kiyohiko , Yoshikawa Yuzo
Published: March 2006

The photolysis of trans(t-N,S)-[Co{S(O)2CH(CH3)COO-S,O}(tren)]+ (t-N = tertiary amine nitrogen; tren = tris(2-aminoethyl)amine) with visible light induced desufurization to yield an organic peroxide complex, trans(t-N,O(C))-[Co{OOCH-(CH3)COO-O,O}(tren)]+, (O(C)) = oxygen of carboxylate group) the structure of which was determined by X-ray analysis.
A Novel Diarylation Reaction of Alkynes by Using Aryltributylstannane in the Presence of Palladium Catalyst
Authors: Oda Hiroshi , Morishita Michiko , Fugami Keigo , Sano Hiroshi , Kosugi Masanori
Published: March 2006

Some alkynes were diarylated by aryltributylstannane 2 in the presence of palladium salt in moderate to good yield with high stereoselectivity. The reaction was catalytic in palladium using copper(II) chloride dihydrate as a reoxidant.
A Unique Copper(II)-Hydroxide Complex Derived from Copper(II)-Superoxide
Authors: Harata Manabu , Jitsukawa Koichiro , Masuda Hideki , Einaga Hisahiko
Published: March 2006

A unique Cu(II)-hydroxide complex, [Cu(tppa)(OH)]ClO4 (TPPA = tris[(6-(pivaloylamino)-2-pyridyl)methyl]amine), has been obtained from the [CuII(tppa)(O2−)]ClO4 complex in a methanol solution and characterized by the electronic absorption, ESR and ESI-MAS spectra and the X-ray diffraction method.
Effective Dispersion of Co in Co-Mo/Al2O3 Induced by High Pressure Sulfiding by Means of FT-IR Using NO as Surface Probe Molecule
Authors: Koizumi Naoto , Iijima Minoru , Kasahara Seiji , Yamada Muneyoshi
Published: March 2006

The surface structure of Co-Mo/Al2O3 sulfided in-situ at high pressure( ≤ 5 MPa) was characterized by FT-IR/DRA method using NO as a probe molecule. The ratio of the band intensity of NO adsorbed on Co site to that of Mo site increased, when Co-Mo/Al2O3 was sulfided at the pressure above 1.1 MPa. Combining the results with those found on catalysts varying the Co/Mo molar ratio, it was suggested that Co site is more effectively dispersed on Mo site by higher pressure sulfiding.
A Novel Synthesis of Dialkyl Carbonates from Carbon Dioxide, Alcohols, and tert-Amines Mediated by Acetylene
Authors: Sasaki Yoshiyuki
Published: March 2006

A novel acetylene-mediated reaction of carbon dioxide with alcohols and tert-amines leads to effective formations of dialkyl carbonates and alkyl N,N-dialkylcarbamates without catalyst.
Photoreactions of Silyliron(II) Complexes Cp′Fe(CO)2SiMe3 (Cp′ = η5-C5H5, η5-C5Me5) with Di-p-tolylgermane (p-Tol)2GeH2
Authors: El-Maradny Amr , Tobita Hiromi , Ogino Hiroshi
Published: March 2006

Photolysis of CpFe(CO)2SiMe3 (Cp = η5-C5H5) in the presence of (p-Tol)2GeH2 afforded a mixture of cis and trans isomers of diiron complexes Cp2Fe2(CO)2(μ-CO){μ-Ge(p-Tol)2} and Cp2Fe2(CO)2{μ-Ge(p-Tol)2}2. The Photostationary state with cis : trans = 85 : 15 was attained by the photolysis of either cis or trans isomer of the latter complex. In contrast, photoreaction of Cp*Fe(CO)2SiMe3 (Cp* = η5-C5Me5) with (p-Tol)2GeH2 gave a monoiron complex Cp*Fe(CO)2GeH(p-Tol)2.
A Novel Way to Design Belousov-Zhabotinskii Oscillators
Authors: Li Hexing , Deng Jingfa
Published: March 2006

A new method has been developed to design BZ type oscillators. A lot of new BZ oscillators including inorganic oscillators and oscillators with amino acids and some peptides as substrates have been obtained by this way.
Epoxidation of Vitamin K3 by Electrochemically Generated Hypohalogen Acids
Authors: Takano Nobuhiro , Ogata Manabu , Takeno Noboru
Published: March 2006

The epoxidation of vitamin K3 was carried out using electrochemically generated hypohalogen acids HOX in organic solvent-water containing halide salts. The electroepoxidation in CH3CN-H2O-NaI system led to the formation of the epoxide in good yield.
Stereospecific 4-Hydrogen Transfer in the Asymmetric Reduction Using (SS)-3-(p-Tolylsulfinyl)-1,4-dihydropyridines, NADH Model Compounds
Authors: Obika Satoshi , Nishiyama Toshihiko , Tatematsu Satoshi , Miyashita Kazuyuki , Imanishi Takeshi
Published: March 2006

In asymmetric reduction of ketones with (SS)-1-benzyl-3-(p-tolylsulfinyl)-1,4-dihydropyridine as a NADH model compound, a stereospecific transfer of the 4-hydrogen was experimentally proved by the use of the 2-methyl congener and the 4-deuterated derivatives.
Highly Efficient Synthetic Method of Optically Active 1,1,1-Trifluoro-2-alkanols by Enzymatic Hydrolysis of the Corresponding 2-Chloroacetates
Authors: Yonezawa Tetsuo , Sakamoto Yoshitaka , Nogawa Kouji , Yamazaki Takashi , Kitazume Tomoya
Published: March 2006

Enantioselective hydrolyses of 2-chloroacetates derived from racemic 1,1,1-trifluoro-2-alkanols were found to proceed very smoothly in the presence of a catalytic amount of lipase MY to yield the corresponding (R)-alcohols with high optical purity. In this procedure, Purification was easily carried out only by a simple distillation of the reaction mixture, enabling us to extend this reaction in a larger scale.
Reactivity of 1,1′-Spirobi(3H-2,1-benzoxatellurole)-3,3′-dione [10-Te-4(C2O2)] with Organic Phosphorus Reagents: The First Synthesis of a Tellurane with Two Carbon- and Two Sulfur-Tellurium Bonds, 1,1′-Spirobi(3H-2,1-benzothiatellurole)-3,3′-dione [10-Te-4(C2S2)]
Authors: Takaguchi Yutaka , Furukawa Naomichi
Published: March 2006

A new spirotellurane, 1,1′-spirobi (3H -2,1-benzothiatellurole)-3,3′-dione [10-Te-4(C2S2)] (2), having two sulfur atoms as the apical ligands and two carbon atoms as the equatorial ligands was obtained by the reaction of the spirotellurane 1 with Lawesson’s reagent. The treatment of 2 with aqueous NaOH gave an unsymmetrical spirotellurane 4. The telluranes 1 and 2 underwent ring-opening reactions on treatment with P(NEt2)3 to afford the telluride 6.
Diastereotropic Phenomena for the Appearance of SmCA* Phase in α-Trifluoromethyl-β-methyl-substituted Liquid Crystalline Molecules
Authors: Mikami Koichi , Yajima Tomoko , Terada Masahiro , Kawauchi Susumu , Suzuki Yoshiichi , Kobayashi Ichiro
Published: March 2006

Anti-ferroelectric (SmCA*) and ferroelectric (SmC*) phases of α-trifluoromethyl-β-methyl-substituted liquid crystalline (LC) molecules, synthesized highly diastereo- and enantioselectively through our chiral titanium complex-catalyzed fluoral-ene reaction, were determined by thermal analysis and electro-optic measurements. Phase transitions were thus found to be critically dependent on the diastereomeric excess (diastereotropic) for ul (Rα, Sβ)-diastereomers of the LC molecules.
Quantitative Detection of Protein Binding onto DNA by Using a Quartz-Crystal Microbalance
Authors: Niikura Kenichi , Nagata Kyosuke , Okahata Yoshio
Published: March 2006

Selective binding process of proteins to DNA strands immobilized on an Au electrode of a quartz-crystal microbalance (QCM) was observed in situ from frequency decrease (mass increase). The binding kinetics of sequence specific binding of NFI to DNA containing its recognition site were compared with those of non-specific binding of histone f3.
Preparation of One Structural Isomer of Tetra-substituted Phthalocyanine, 1,8,15,22-Tetra(3′-pentoxy)phthalocyanine, and a Crystal Structure of Its Nickel(II) Complex
Authors: Kasuga Kuninobu , Kawashima Makoto , Asano Kenichiro , Sugimori Tamotsu , Abe Kohji , Kikkawa Takahiko , Fujiwara Takaji
Published: March 2006

The selective preparation of 1,8,15,22-tetra(3′-pentoxy)phthalocyanine from 3-(3′-pentoxy)-1,2-dicyanobenzene was carried out. Its nickel(II) complex was obtained from the phthalocyanine and nickel(II) chloride, and a crystal structure of the complex was determined by an X-ray analysis.
RNA Hydrolysis by the Combination of the Lanthanum(III) Ion and Hydrogen Peroxide
Authors: Komiyama Makoto , Kamitani Jun , Sumaoka Jun , Asanuma Hiroyuki
Published: March 2006

Diribonucleotides are efficiently hydrolyzed by the combination of the lanthanum(III) ion and hydrogen peroxide at pH 7.2 and 30 °C. The rate constant for the hydrolysis of adenylyl(3′-5′)adenosine by the mixture of La(ClO4)3 (10 mmol dm−3) and H2O2 (100 mmol dm−3) is 7.7 × 10−2 min−1 (half-life 9 min), corresponding to a 460 fold cooperative promotion of the catalysis.
Single Crystal X-Ray Analyses of a Series of Hexamethylphosphoramide-Coordinated Complexes of Rare Earth Triflates: Existence of Tetrad Effects in the Coordinate Bonds
Authors: Imamoto Tsuneo , Nishiura Masayoshi , Yamanoi Yoshinori , Tsuruta Hideyuki , Yamaguchi Kentaro
Published: March 2006

The molecular structures of [M(OTf)2(hmpa)4]OTf·CHCl3(OTf = OSO2CF3; M = Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), [Sc(OTf)2(hmpa)4]OTf, and [La(η2-OTf)(OTf)(hmpa)4]OTf·CHCl3 were accurately determined by single crystal X-ray analyses. Tetrad effects are manifested in the series of the coordinate bond lengths.
Spectral Evidence and Kinetics for Formation of the Sitting-Atop Complex of Copper(II) Ion with 5,10,15,20-Tetraphenylporphyrin in Acetonitrile
Authors: Inada Yasuhiro , Sugimoto Yumi , Nakano Yuko , Funahashi Shigenobu
Published: March 2006

The kinetic parameters for the formation of the sitting-atop (SAT) complex of the copper(II) ion with 5,10,15,20-tetraphenylporphyrin (H2tpp) were directly determined in acetonitrile. The large ΔH≠ and ΔS≠ values imply that deformation of the porphyrin ring is required during the activation process. In the SAT complex, the protons bound to the pyrrole nitrogens remain on the nitrogens and by the addition of a base such as pyridine, they are abstracted to form the Cu(tpp) complex, in which the copper(II) ion is incorporated into the porphyrin core.
A Facile Synthesis of Angularly-Fused 3,4,4a,10b-Tetrahydro-2H,5H-pyrano[3,2-c][1]benzopyrans by the One-pot Condensation between Salicylaldehydes and Unsaturated Alcohols
Authors: Inoue Seiichi , Asami Masatoshi , Honda Kiyoshi , Miyazaki Hidekazu
Published: March 2006

Salicylaldehydes reacted with 5-methyl-4-hexen-1-ol (4a) or 6-methyl-5-hepten-2-ol (4b) in benzene in the presence of trimethyl orthoformate and a catalytic amount of p-toluenesulfonic acid at rt to give angularly-fused trans-5,5-dimethyl-3,4,4a,10b-tetrahydro-2H,5H-pyrano[3,2-c][1]benzopyrans (6) in high yields with complete stereoselectivity.
Conversion Dependence of Enantioselective Hydrogenation of (E)-α-Phenylcinnamic Acid on Cinchonidine-Modified Pd/TiO2 Catalyst
Authors: Nitta Yuriko , Kobiro Kazuya
Published: March 2006

The enantioselectivity of a cinchonidine-modified Pd/TiO2 catalyst varied with the extent of conversion in the hydrogenation of (E)-α-phenylcinnamic acid. The incremental enantioselectivity reached a maximum at an early stage of the reaction. Under optimized reaction conditions, optical yields of up to 72 %e.e. of (S)-(+)-2,3-diphenylpropionic acid were obtained at 100 % conversion.
Open and Closed Conformations of Binuclear Cu(II) Complexes with a Bimacrocyclic Ligand Linked by a Tetramethylene Chain
Authors: Mochizuki Katsura , Miyashita Sen
Published: March 2006

A binuclear Cu(II) complex with a bimacrocyclic ligand, [Cu2(OH2)2L](ClO4)4·4H2O (L: 7,7′-tetramethylene-bis[2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),2,11,13,15-pentaene]) has the open conformation, in which the tetramethylene chain is staircase-like so that two macrocycles are as far apart as possible. [Cu2Cu2L](ClO4)2·H2O adopts the closed conformation, in which the tetramethylene chain is folded so that the two macrocycles face each other.
The Effect of Terminal Group on Electron-Transfer Kinetics of Azobenzene Self-Assembled Monolayers on Gold
Authors: Yu Hua-Zhong , Wang Yong-Qiang , Cai Sheng-Min , Liu Zhong-Fan
Published: March 2006

The apparent electron-transfer rates of a new class azobenzene self-assembled monolayers on gold decreased significantly with increasing chainlength of terminal groups. With terminal groups longer than three carbon atoms, no distinguish feature for faradic response was observed.
Iron(III) Complex of a Trihydroxamate Ligand with an Ala-Ala-(HO)Gly-Ala Sequence as a Model for Ferrioxamines. Formation of Well-Defined Peptide Loop Structure
Authors: Akiyama Masayasu , Katoh Akira , Mutsui Yuriko , Watanabe Yuichi , Umemoto Kimiko
Published: March 2006

A dodecapeptide trihydroxamate ligand forms a well-defined chiral complex with iron(III) in which this small linear peptide assumes a unique loop conformation, uncommon to protein structures. The complex exhibits siderophore activity for a test microorganism.
Oxidative Dehydrogenation of Glycolic Acid to Glyoxylic Acid over Fe-P-O Catalyst
Authors: Ai Mamoru , Ohdan Kyoji
Published: March 2006

Glyoxylic acid was obtained by a vapor phase oxidative dehydrogenation of glycolic acid over an iron phosphate catalyst with a P/Fe atomic ratio of 1.2. The one-pass yield reached 59 mol% at the glycolic acid conversion of 78%; the selectivity of 76 mol%.
Distribution of Zinc Tetraphenylporphine in Single Melamine-Resin/Toluene Microcapsules Studied by Laser Trapping-Microspectroscopy
Authors: Kim Haeng-Boo , Yoshida Shuri , Miura Atsushi , Kitamura Noboru
Published: March 2006

Absorption microspectroscopy has been conducted to study chemical properties of single melamine-resin microcapsules containing a zinc tetraphenylporphine (ZnTPP)/toluene solution. Although absorbance of ZnTPP in the capsule increased with increasing the capsule diameter, its tendency was much smaller than that expected from a homogeneous distribution of ZnTPP in the inner toluene solution. The results were discussed in terms of a distribution of ZnTPP in both the melamine-resin and toluene phases.
57Fe Mössbauer Spectroscopic Study on the Dynamics of Ferrocene Enclathrated in Deoxycholic Acid
Authors: Nakashima Satoru , Nakashita Mitsuyori , Sakai Hiroshi
Published: March 2006

The molecular motion of ferrocene molecules enclathrated in deoxycholic acid was investigated by means of 57Fe Mössbauer spectroscopy, and it was newly suggested that an anisotropic vibration of the ferrocene molecule is coupled with the rotation above 280 K.
Stereoselective Route to the Highly Oxidated Sidechain Moiety of Terpentecin and Related Antibiotics
Authors: Takao Ken-ichi , Aiba Yasuyuki , Ito Hisanaka , Kobayashi Susumu
Published: March 2006

Highly oxidated sidechain moiety of antitumor terpentecin and related antibiotics is prepared in a stereoselective manner from diacetone glucose through furanoside intermediates.