bluuebunny/crossref_metadata_2025 huggingface dataset:
Stereoselective Synthesis of N-Acetyl-α-neuraminosyl-galactose Disaccharide
Authors: Mukaiyama Teruaki , Sasaki Takenori , Iwashita Eiichiro , Matsubara Koki
Published: March 2006

The glycosylation of N-acetylneuraminic acid (Neu5Ac) donor having an easily accessible acetoxy or phenoxycarbonyloxy leaving group at an anomeric position with the 6-OH position of d-galactose in propionitrile is effectively promoted by the catalyst generated from dichlorodimethylsilane and silver perchlorate to afford the corresponding α-sialosides in good yield with good stereoselectivity.
X-Ray Crystal Structure of Guaiazulenequinone and the Structures of Two New Guaiazulenone Derivatives
Authors: Takekuma Hideko , Takekuma Shin-ichi , Matsubara Yoshiharu , Yamamoto Hiroshi , Nozoe Tetsuo
Published: March 2006

The first X-ray crystallographic analysis on azulenequinones is reported for 3,5-guaiazulenedione. Two unique azulenone derivatives, 3a-hydroxy-3(3aH)-guaiazulenone and 2,2′-bi-3,5-guaiazulenedione, are obtained by the autoxidation of 5,5′-biguaiazulene-3,3′(5H,5′H)-dione in pyridine at 25 °C. The possible reaction pathways for these azulenone formation are discussed.
Electroreduction of a Chlorofluoroethane on a Solid Polymer Electrolyte Composite Electrode
Authors: Inaba Minoru , Sawai Ken , Ogumi Zempachi , Takehara Zen-ichiro
Published: March 2006

The dechlorination of 2-chloro-1,1,1,2,-tetrafluoroethane (HCFC-124) was carried out electrochemically on a solid polymer electrolyte composite electrode (Pd-Neosepta). As the sole product 1,1,1,2-tetrafluoroethane (HFC-134a) was obtained. Irradiation with light of a xenon arc lamp enhanced the dissociation of C–Cl bond of the reactant adsorbed on Pd, resulting in an increase in the rate for HFC-134a formation.
Synthesis and Evaluation as a Gene Transfer Agent of a 1,2-Dimyristoyl-sn-glycero-3-pentalysine Salt
Authors: Weibel Jean-Marc , Kichler Antoine , Remy Jean-Serge , Gaiddon Christian , Loeffler Jean-Philippe , Duportail Guy , Heissler Denis
Published: March 2006

1,2-Dimyristoyl-sn-glycero-3-pentalysine hexakis(trifluoroacetate) 1 has been synthesized and its transfection efficiency has been compared with that of the commercially available lipid DOTAP (3T3 mouse fibroblast cells; CMV-Luc plasmid). When the positive (lipid) / negative (DNA) charge ratio was 6, the lipid 1 was 1.7 times more efficient than DOTAP.
Synthesis and Dynamic Stereochemistry of Bis(3-methyl-1-azulenyl)(1-naphthyl)methyl Hexafluorophosphate. Clear Evidence of the One-Ring Flip Mechanism of Molecular Propeller by Controlling the Flipping Ring
Authors: Ito Shunji , Fujita Miwako , Morita Noboru , Asao Toyonobu
Published: March 2006

Stable carbocation, bis(3-methyl-1-azulenyl)(1-naphthyl)methyl hexafluorophosphate was synthesized by the hydride abstraction reaction of the corresponding hydrocarbon. The cation showed extremely high stability with pKR+ value (11.0). The low temperature 1H NMR spectra showed that the flipping ring was controlled by 1-naphthyl group.
Cyclic Fulgenates. Enlargement of Quantum Yield of Coloring Reaction of Photochromic Fulgenates
Authors: Yokoyama Yasushi , Miyasaka Masahiro , Uchida Soichi , Yokoyama Yayoi
Published: March 2006

Four cyclic indolylfulgenates, derivatives of fulgenates with 1,4-butane-, 1,5-pentane-, and 1,10-decanediols and 1,2-bis(hydroxymethyl)benzene, were synthesized and their photochromic properties were compared with those of dimethyl indolyfulgenate. The most notable feature of cyclic fulgenates with relatively short alkyl chains is that the coloring quantum yield of UV-light irradiation is much larger than that of the acyclic fulgenate and that of the cyclic fulgenate with a long alkyl chain.
Structures of Four Novel Highly Oxygenated Labdane-Type Diterpenoids, Ptychantins F-I, from the Liverwort Ptychanthus striatus
Authors: Hashimoto Toshihiro , Horie Miho , Takaoka Shigeru , Tori Motoo , Asakawa Yoshinori
Published: March 2006

Four novel highly oxygenated labdane-type diterpenoids, named ptychantins F-I (1–4) have been isolated from the liverwort Ptychanthus striatus, and their structures including their absolute configurations established by a combination of high resolution NMR and CD spectra, X-ray crystallographic analysis, and chemical degradations.
New Type of C-Pivot Tripode Ligands for Complexation towards Alkali Metal Cations
Authors: Nakatsuji Yohji , Kita Kohji , Masuyama Araki , Kida Toshiyuki
Published: March 2006

A series of C-pivot tripode ligands containing a 2-methylglycerol unit were newly prepared and their complexation properties towards alkali metal cations were examined by the solvent extraction method and UV spectroscopy. These types of compounds possessed a higher extractability than the other type of tripode ligand derived from trimethylolethane. This finding clearly shows that the proper selection of the basic skeletal structure is important for the molecular design of C-pivot tripode ligands.
A New System for Alkane Oxidation. Modification of Gif-type Reactions Using O2/H2 with a Pd Catalyst
Authors: Kim Sang-Bum , Jun Ki-Won , Kim Seong-Bo , Lee Kyu-Wan
Published: March 2006

We have investigated the modification of Gif-type reactions using hydrogen peroxide formed in situ by the palladium catalyzed combining of oxygen and hydrogen. The oxidation of cyclohexane in the solvent mixture, acetone-acetic acid, gives cyclohexanol and cyclohexanone with rather high yields, but any solvent containing pyridine is not suitable for the modified system.
A Novel Concept of Acid Proliferation. Autocatalytic Fragmentation of an Acetoacetate Derivative as an Acid Amplifier
Authors: Ichimura Kunihiro , Arimitsu Koji , Kudo Kazuaki
Published: March 2006

tert-Butyl 2-methyl-2-(p-toluenesulfonyloxymethyl)acetoacetate was designed to be subjected to the acid-catalyzed fragmentation to liberate p-toluenesulfonic acid which can act as the autocatalyst to lead to the increment of the acid concentration in geometric progression.
Synthesis of an Upper-rim-connected Biscalix[4]arene and Its Improved Inclusion Ability Based on the Cooperative Action
Authors: Araki Koji , Hisaichi Katsuya , Kanai Toshio , Shinkai Seiji
Published: March 2006

Conformationally-immobile biscalix[4]arene made by connecting the upper rims showed the high inclusion ability for N-methylpyridimium and homologous cationic guest molecules. Comparison with reference compounds established that the enhanced inclusion ability is due to the cooperative action of two upper-rim-confronted calix[4]arenes.
Charge Separation in Zinc Diporphyrin-Zinc Porphyrin-Pyromellitimide-Quinone Tetrads
Authors: Osuka Atsuhiro , Yamada Hiroko , Maruyama Kazuhiro , Ohno Takeshi , Nozaki Koichi , Okada Tadashi , Tanaka Yoshinori , Mataga Noboru
Published: March 2006

Tetrads 3 and 5 consisting of 1,2-phenylene-bridged zinc diporphyrin (D), zinc porphyrin (M), pyromellitimide (I), and quinone (Q) were synthesized. Upon photoexcitation, these tetrads provide fully charge separated ion pair states (D)+—M—I—(Q)−, whose lifetimes are longer than those of corresponding Q-free triads.
Analysis of Ion Association Property of Aromatic Divalent Anions with Quaternary Ammonium Ions in Aqueous Solution through Mobility Change of Capillary Electrophoresis
Authors: Takayanagi Toshio , Motomizu Shoji
Published: March 2006

Formation of ion associate in an aqueous solution has been examined using some aromatic divalent anions and symmetric quaternary ammonium ions through the mobility change of capillary electrophoresis. The electrophoretic mobilities of the anions decreased with an increase in the concentrations of bulky quaternary ammonium ions. Ion association constants (Kass) of 2,6-naphthalenedicarboxylate, 1,5-naphthalenedisulfonate, and 2,6-naphthalenedisulfonate with tetrabutylammonium ion as a pairing ion were determined to be 101.4, 101.4, and 101.3, respectively, while mobility changes of 2,3-naphthalenedicarboxylate and phthalate ions were slight. Several quaternary ammonium ions were examined. The results suggest that the bulkiness of the pairing cations is related to the ion association in aqueous solutions.
Highly Enantioselective Imino Pinacol Coupling Leading to the Synthesis of 1,2-Diphenylethylenediamine Derivatives
Authors: Shimizu Makoto , Iida Toyoshi , Fujisawa Tamotsu
Published: March 2006

Enantioselective imino pinacol coupling of p-anisylbenzalimine was promoted by the use of Zn-Cu couple in the presence of (+)-camphorsulfonic acid to give (R,R)-1,2-diphenylethylenediamine derivative in high enantiomeric purity.
Pre-equilibrium Determining the Rate and Selectivity in the Ligand-exchange of Cu(II) Complex, Cu(II)(H−2Gly-Gly-X), with Cysteine to Yield a Ternary Complex, (Cys)N,SCu(II)(H−1Gly-Gly-X)
Authors: Hanaki Akira , Nagai Akiko , Ikota Nobuo
Published: March 2006

Equilibrium constant for the reaction of Cu(II)(H−2Gly-Gly-X) with N-acetyl-l-cysteine to yield a ternary complex, (AcCys)SCu(II)(H−2Gly-Gly-X), was determimed. A linear free energy relationship existed between this equilibrium constant and rate constant for the ligand-exchange with l-cysteine to form a ternary complex, (Cys)N,SCu(II)(H−1Gly-Gly-X), indicating the presence of pre-equilibrium state in the ligand-exchange reaction.
Synthesis of Model Compounds of the Precursor of Carthamin, a Colouring Matter of Safflower, and Their Conversion into Carthamin-Type Compounds
Authors: Kumazawa Toshihiro , Amano Yoshikazu , Haga Toyokazu , Matsuba Shigeru , Sato Shingo , Kawamoto Ken-ichi , Onodera Jun-ichi
Published: March 2006

Model compounds of the precursor of carthamin 3, 4, and 5 were prepared. And in analogy with the precursor of carthamin (PRE) 1, they were converted into carthamin-type compounds 13, 14, and 15, respectively, when sprayed with peroxidase-H2O2 solution. It was also found that these conversions proceeded quantitatively by treatment with phosphate buffer extract of a cultured safflower cell and this conversion reaction proceeded by oxidative decarboxylation.
The Methylene Adduct of Bis(1,2-diphenyl-1,2-ethylenedithiolato)nickel(II): A Nickel(II) Complex of cis-(Methylenethio)stilbenethiol Which Cyclodimerizes to 4,5,9,10-Tetraphenyl-1,3,6,8-tetrathia-4,9-cyclodecadiene
Authors: Sakurada Masami , Schlemper Elmer O , Schrauzer Gerhard N
Published: March 2006

The reaction of bis(1,2-diphenyl-1,2-ethylenedithiolato)nickel(II), Ni(S2C2Ph2)2, with diazomethane affords a 1:1 methylene adduct, Ni[CH2(S2C2Ph2)2] (2), which is identified as a nickel(II) complex of cis-(methylenethio)stilbenethiol (3). Ligand 3 cyclodimerizes, on decomposition of 2 or by reaction of 2 with 2,2′-bipyridyl, to yield 4,5,9,10-tetraphenyl-1,3,6,8-tetrathia-4,9-cyclodecadiene.
Novel S-Bridged Tetranuclear Cobalt(III) Complexes with 2-Aminoethanethiolate Formed by Ligand Transfer from Nickel(II) to Cobalt(III)
Authors: Konno Takumi , Okamoto Ken-ichi
Published: March 2006

The reaction of [CoCl(NH3)5]2+ with [Ni(aet)2] (aet = 2-aminoethanethiolate) in water gave two pairs of racemic isomers of a novel S-bridged tetracobalt(III) complex, [{Co2(aet)2}{Co(aet)3}2]4+, in which four chiral cobalt atoms are linked by one double and two triple sulfur-bridges to have a boat-type metal array.
Reaction of Guaiazulene with Bromine in Hexane and in Aqueous Tetrahydrofuran
Authors: Nozoe Tetsuo , Shindo Kimio , Wakabayashi Hidetsugu , Kurihara Teruo , Uzawa Jun
Published: March 2006

3-Bromoguaiazulenium bromide and 3,3-dibromo guaiazulenium bromide were obtained respectively from the reaction of guaiazulene and its 3-bromo compound with 1 equivalent of bromine in hexane at −20 °C. The former compound afforded in methanol a mixture of guaiazulene, 3,3′-biguaiazulene, and oligomers, and gave 3-bromoguaiazulene quantitatively with alkali. Dibromoguaiazulenium bromide afforded with further moles of bromine in aqueous THF a mixture of guaiazulenequinone, 3-bromo-1-hydroxyguaiazulen-5-one, and a dark blue solid A in different ratios depending on the reaction conditions.
The First Trigonal-bipyramidal Structure of Zinc(II) Complex of a Bleomycin Model
Authors: Kurosaki Hiromasa , Hayashi Kentarou , Ishikawa Yoshinobu , Goto Masafumi
Published: March 2006

A new bleomycin analogue 2-[((2-(imidazolyl)ethyl)amino)carbonyl]-6-[((2-amino-2-methylpropyl)amino)methyl]pyridine, L, was prepared and the coordination mode of L to Zn(II) was characterized in both solution and solid state as a Zn(II)-bleomycin model complex. With L, ZnII forms 4-coordinate, tetrahedral [ZnL]2+ at pH < 6 and 5-coordinate [ZnH−1L]+ at pH > 8. The [ZnH−1L]ClO4·H2O complex has a trigonal-bipyramidal complex structure by the X-ray crystal study.
New Xenia Diterpenoids from a Soft Coral, Xenia Species
Authors: Iwagawa Tetsuo , Amano Yasuhisa , Hase Tsunao , Shiro Motoo
Published: March 2006

Two new xenia diterpenoids, xeniatine A (1) and xeniaether A (2), the latter containing a tetrahydrofuran, have been isolated from a soft coral, Xenia sp.
Freezing Bond Rotation by a Pin in Cyclopentadienyl(cyclobutadiene)cobalt(I) Complexes. A New Type of Atropisomerism
Authors: Uno Mitsunari , Shirai Kazuhiko , Ando Katsuhiro , Komatsuzaki Nobuko , Tanaka Takanori , Sawada Masami , Takahashi Shigetoshi
Published: March 2006

The X-ray crystallographic and CD spectral analyses of Cp1Co(C4Ar4), 1 and 2, reveal that the (−)-menthyl group on a C5 ring restricts the free rotation of single bonds between C4 ring and phenyl groups even in solution and induces a helical chirality on the C4Ar4 moiety; complexes 1∼4 provide the new type of atropisomerism originating from freezing bond rotation by a pin stuck from the C5 ring into a four-blade windmill on the C4 ring.
Sodium Ion Sensing by Cellulose Triacetate Plasticizer Membrane Containing Dibenzo-16-crown-5 Chromoionophore
Authors: Hayashita Takashi , Kumazawa Mitsuaki , Lee Jong Chan , Bartsch Richard A
Published: March 2006

We have designed new optical membrane sensor which is composed of cellulose triacetate polymer as a membrane support, o-nitrophenyloctyl ether as a membrane plasticizer and sym-(decyl)(2-hydroxy-5-nitrobenzyloxy)dibenzo-16-crown-5 (1) as a Na+ ion selective chromoionophore. This type of membrane was found to selectively respond to Na+ in the detection limit of 10−5 M (1 M = 1 mol dm−3) with no significant interference from Li+ and K+ ions.
Synthesis of Azaspirodienones via Intramolecular Cyclization of p-Hydroxybenzylacetone Oximes and Their Transformation into Quinolines
Authors: Kusama Hiroyuki , Uchiyama Katsuya , Yamashita Yuko , Narasaka Koichi
Published: March 2006

Intramolecular cyclization reaction on the nitrogen atom of oximes of p-hydroxybenzylacetone derivatives proceeds by the treatment with tetrabutylammonium perrhenate and trifluoromethanesulfonic acid in refluxing 1,2-dichloroethane to afford azaspirodienones in good yield. The azaspirodienones are transformed into quinolines via dienone-phenol rearrangement.
Photoactive TiO2 Containing Paper: Preparation and Its Photocatalytic Activity under Weak UV Light Illumination
Authors: Matsubara Hirokazu , Takada Makoto , Koyama Shinichi , Hashimoto Kazuhito , Fujishima Akira
Published: March 2006

TiO2-containing papers with highly photocatalytic activity have been prepared. Their photocatalytic activity was investigated by measuring the decomposition of gaseous acetaldehyde under illumination from a weak UV light source such as a conventional white fluorescent light bulb. It was found that the photocatalytic efficiency of the TiO2-containing papers was higher than that of Degussa P-25, one of the most efficient commercial TiO2 powders, indicating that paper pulp serves as a good matrix for highly efficient TiO2 photocatalysts.
Lewis Acid-Promoted [2+2] Azetidine Annulation of N-Acylaldimines with Allyltriisopropylsilane
Authors: Uyehara Tadao , Yuuki Mizue , Masaki Hiroaki , Matsumoto Moriji , Ueno Masako , Sato Toshio
Published: March 2006

Lewis acid-catalyzed reactions of an N-acylaldimine with allyltriisopropylsilane gave [2+2] azetidine annulation products, while those of an N-ethoxycarbonylaldimine gave an allylated product.
Rearrangement of Tosyl Group of 3,4-Disubstituted 2-Tosylpyrroles under Mild Acidic Conditions
Authors: Kohori Kazuhiro , Kinoshita Hideki , Inomata Katsuhiko
Published: March 2006

Tosyl group of 3,4-disubstituted 2-tosylpyrroles easily rearranged from 2- to 5-position by treatment with TFA. The ratio of the regioisomers at equilibrium was definitely influenced by the bulkiness of the substituent at 3-position of the starting 2-tosylpyrroles.
Improvement of Photocatalytic Activity and Product Selectivity by Cadmium Metal Deposited in situ on Suspended Cadmium(II) Sulfide Particles
Authors: Ohtani Bunsho , Kusakabe Satoshi , Nishimoto Sei-ichi , Matsumura Michio , Nakato Yoshihiro
Published: March 2006

Effect of annealing of commercial crystalline CdS powders on their photocatalytic activity and product selectivity was investigated for stereoselective diamino-N-cyclization of 2,6-diaminopimelic acid operated in a deaerated aqueous solution. Surface analyses revealed the formation of sulfur vacancy, which promotes the photoinduced cadmium metal (Cd0) deposition. The Cd0, detected by reduction of methylviologen, may act as a reduction site for photoexcited electrons.
Structure and Unusual Electronic Spectra of Decaisopropyl-7-oxabicyclo[2.2.1]heptasilane
Authors: Kyushin Soichiro , Sakurai Haruaki , Yamaguchi Hiroyuki , Goto Midori , Matsumoto Hideyuki
Published: March 2006

Decaisopropyl-7-oxabicyclo[2.2.1]heptasilane was synthesized by oxidation of decaisopropylbicyclo[2.2.0]hexasilane with m-chloroperbenzoic acid, and its structure was determined by X-ray crystallography. The compound shows unusual properties in the UV spectrum due to the interaction of the n orbital of the oxygen atom and the Si-Si σ bonds. The compound also shows far stronger fluorescence than the bicyclic ladder polysilane.
Hydrogenation of Carbon Dioxide over Fe-ZnO/Zeolite Composite Catalysts
Authors: Fujiwara Masahiro , Ando Hisanori , Matsumoto Masami , Matsumura Yasuyuki , Tanaka Mutsuo , Souma Yoshie
Published: March 2006

The hydrogenation of carbon dioxide was studied over the composite catalysts comprised of Fe catalysts and HY zeolite. In the case of Fe-ZnO/HY, the distribution of hydrocarbons showed that hydrocarbons were obtained by methanol to gasoline reaction, not by Fischer-Tropsch reaction.
A Novel Calixarene-Analogous Macrocyclic Metacyclophane, “Molecular Pendulum”
Authors: Yamoto Takehiko , Doamekpor Louis Korbla , Tsuzuki Hirohisa , Tashiro Masashi
Published: March 2006

Hydroxy[3.1.1]metacyclophane, which is regarded as an unsymmetric or uncomplete “homocalixarene” bearing a propane bridge, has been synthesized using Nafion-H catalyzed cyclobenzylation. A novel “pendulum” type motion steered by intramolecular hydrogen bonding has been observed.
Chain and Discrete Dimer Complexes of Molybdenum(II) Trifluoroacetate Axially Coordinated by p-Quinones, [Mo2(O2CCF3)4(2,6-Me-BQ)]n (2,6-Me-BQ = 2,6-dimethyl-p-benzoquinone) and [Mo2(O2CCF3)4(2,6-t-Bu-BQ)2] (2,6-t-Bu-BQ = 2,6-di-t-butyl-p-benzoquinone)
Authors: Handa Makoto , Matsumoto Hiroki , Namura Toshihiro , Nagaoka Tamie , Kasuga Kuninobu , Mikuriya Masahiro , Kotera Takanori , Nukada Ryoji
Published: March 2006

A chain complex [Mo2(O2CCF3)4(2,6-Me-BQ)]n (2,6-Me-BQ = 2,6-dimethylbenzoquinone) and a bis p-quinone adduct complex [Mo2(O2CCF3)4(2,6-t-Bu-BQ)2] (2,6-t-Bu-BQ = 2,6-di-t-butyl-p-benzoquinone) have been prepared and characterized by X-ray crystal structure analyses, 13C-NMR spectrum, and cyclic voltammetry. The effect of alkyl groups R (= Me, t-Bu) at the 2,6-positions of the p-benzoquinone on the structures of the complexes have been discussed.
Preparation of (+)-Tricyclo[6.2.1.02,7]undec-2(7)-en-3-one and Its Conversion into (+)-epi-β-Santalene
Authors: Kamikubo Takashi , Ogasawara Kunio
Published: March 2006

Optically pure (+)-tricyclo[6.2.1.02,7]undec-2(7)-en-3-one was first prepared from (+)-tricyclo[6.2.1.02,7]undeca-4,9-dien-3-one in four steps. Conjugated addition occurred selectively from the methano-bridge side to give the 1,4-adduct which was converted into natural (+)-epi-β-santalene.
Immobilization of Strontium by Cerium Hydrogen Phosphate
Authors: Hayashi Hiromichi , Ebina Takeo , Torii Kazuo
Published: March 2006

The effect of heat-treatment temperature on the immobilization of strontium by cerium hydrogen phosphate was studied. Effective immobilization was achieved when calcined at the temperature from 300 to 500 °C, whereas strontium leached out accompanying with the formation of CePO4 above 600 °C.
A Photochromic Dithienylethene That Turns Yellow by UV Irradiation
Authors: Uchida Kingo , Irie Masahiro
Published: March 2006

1,2-Bis(3,5-dimethyl-2-thienyl)perfluorocyclopentene which shows a reversible color change from colorless to yellow by UV irradiation was synthesized. The color of the photogenerated closed-ring forms was dependent on the substitution position of the thiophene rings to the perfluorocyclopentene moiety.
Salannal, a New Limonoid from Melia azedarach Linn
Authors: Nakatani Munehiro , Huang Ruo Chun , Okamura Hiroaki , Iwagawa Tetsuo , Tadera Kenjiro
Published: March 2006

A new limonoid of biogenetic interest, salannal, was isolated along with salannin and nimbolinin B from the root of M. azedarach L. and the structure was elucidated by spectroscopic means.
The Cross-Coupling Reaction of Aldehydes with α-Diketones by the Use of Bismuth Trichloride and Metallic Zinc
Authors: Miyoshi Norikazu , Fukuma Tomohiro , Wada Makoto
Published: March 2006

In the presence of bismuth trichloride and metallic zinc, α-diketones react with aldehydes in THF under reflux to afford the corresponding α,β-dihydroxyketones in moderate to good yields. It was also found that the present reaction proceeds smoothly by using a catalytic amount of bismuth trichloride to give the corresponding adducts. The present reaction takes place even in aqueous media.
Molecular Arrangement in an Azobenzene-Terminated Self-Assembled Monolayer Film
Authors: Wang Rong , Iyoda Tomokazu , Jiang Lei , Hashimoto Kazuhito , Fujishima Akira
Published: March 2006

An azobenzene-functionalized meterial was used to perform comparative investigation of molecular arrangements in self-assembled monolayer film and in crystalline state. By the means of atomic force microscopy and absorption spectroscopy, a unique herringbone structure was revealed in the densely packed self-assembled monolayer film.
New Chiral Diphosphines, 2,3-Bis(siloxy)-1,4-bis(diphenylphosphino)butanes, and Their Cationic Rh(I) Complexes: Synthesis and Structures
Authors: Tamao Kohei , Nakamura Kazunori , Yamaguchi Shigehiro , Shiro Motoo , Saito Seiki
Published: March 2006

A series of 2,3-bis(siloxy)-1,4-bis(diphenylphosphino)butanes SILOPs, possessing various siloxy groups, and their Rh(I) complexes have been prepared. The X-ray structure of a SILOP shows a staggered conformation with two siloxy groups in the anti positions. The X-ray crystal structure of a cationic Rh(I)-SILOP complex, however, shows an anti arrangement of not the two siloxy groups but the two silyl groups with respect to the O–O axis, which reinforces the C2-symmetrical environment around the metal center.
Solid-Surface Fluorescence Characteristics and X-Ray Crystal Structures of Inclusion Compounds of Imidazoanthraquinol-type Fluorescent Host with Ethanol and 1,4-Dioxane
Authors: Yoshida Katsuhira , Tachikawa Tatsuya , Yamasaki Jun , Watanabe Shigeru , Tokita Sumio
Published: March 2006

The crystal structures of host-guest inclusion compounds of the title fluorescent host with ethanol and 1,4-dioxane were elucidated by X-ray crystal analysis. The solid-surface fluorescence spectra of the inclusion crystals were also measured. The fluorescence emission of the host was dramatically enhanced upon enclathration of the guest molecules.
Practical and Efficient Enantioselective Borohydride Reduction of Aromatic Ketones Catalyzed by Optically Active Cobalt(II) Complexes Using Pre-Modified Borohydride
Authors: Sugi Kiyoaki D , Nagata Takushi , Yamada Tohru , Mukaiyama Teruaki
Published: March 2006

A catalytic enantioselective borohydride reduction of aromatic ketones in presence of 0.1-1 mol% of optically active aldiminato cobalt(II) complex catalysts at 0 °C was successfully achieved using precisely pre-modified borohydride with one equivalent each of tetrahydrofurfuryl alcohol, ethanol and NaBH4. The corresponding secondary alcohols were produced in less than 45 min with high enantiomeric excesses (up to 98% ee). The above method was successfully applied to kinetic and dynamic kinetic resolutions of aromatic ketones.
Kinetics and Mechanism of Cyclopalladation for [Pd(S)(Bn2Medptn)](BF4)2 (S = Solvent, Bn2Medptn = N,N″-Dibenzyl-N′-methyl-3,3′-diaminodipropylamine) and Its Derivatives
Authors: Yagyu Takeyoshi , Aizawa Sen-ichi , Funahashi Shigenobu
Published: March 2006

The kinetics of the cyclopalladation for [Pd(CH3CN)(Bn2Medptn)](BF4)2 (Bn2Medptn = N,N″-dibenzyl-N′-methyl-3,3′-diaminodipropylamine) and its derivatives confirmed the concerted mechanism where both the electrophilic attack of the palladium(II) center toward the ortho benzyl carbon and the nucleophilic interaction of the basic solvent with the ortho proton are operative in the activation process for the cyclopalladation.
Synthesis of a New Ruthenium Complex of a Macrocyclic Ligand Containing 1,10-Phenanthroline, and Its Photo-Mediated Covalent Binding to DNA
Authors: Hirai Miwa , Shinozuka Kazuo , Ogawa Shojiro , Sawai Hiroaki
Published: March 2006

A ruthenium complex of a macrocyclic compound, consisting of two 1,10-phenanthroline molecules bridged by sulfur, was synthesized by template-directed macrocyclization on the ruthenium ion. The complex links to DNA by photo-mediated substitution of the coordinated chloro ion with the heterocyclic base of DNA and induces DNA cleavage.
An Efficient Method for Catalytic Stereoselective Synthesis of α-l-Fucopyranosides
Authors: Mukaiyama Teruaki , Takeuchi Kazuya , Higuchi Satoshi , Uchiro Hiromi
Published: March 2006

A new efficient method for the catalytic stereoselective synthesis of various α-l-fucosides by using an easily available and stable glycosyl donor, 2,3,4-tri-O-benzyl-l-fucopyranosyl methoxyacetate, is established. Also, trimethylsilyl trifluoroacetate and lithium perchlorate are found to be effective additives in the synthesis of Fucα1-3GlcNAc and Fucα1-4GlcNAc linkages.
p-(4-Nitrophenylazo)phenol Dye-bridged Permethylated α-Cyclodextrin Dimer: Synthesis and Self-aggregation in Dilute Aqueous Solution
Authors: Jung Jong Hwa , Takehisa Chiaki , Sakata Yoshiteru , Kaneda Takahiro
Published: March 2006

The title compound 1 exhibited the time-dependence of the VIS and 1H-NMR spectra in aqueous solution at room temperature in the dark. These phenomena were interpreted in terms of the self-aggregation involving intermolecular inclusion of the p-(4-nitrophenylazo)phenol group with one of the two permethylated α-cyclodextrins of 1.
Chromogenic 1,10-Phenanthroline for Determination of Lithium Ion
Authors: Sugihara Hideki , Kajiwara Jun-ichi , Akabori Sadatoshi , Hiratani Kazuhisa
Published: March 2006

A new chromogenic 1,10-phenanthroline bearing picrylamino residue diplays a striking lithium ion-selective shift in maximum absorbance in the presence of base upon addition of lithium ions; upon lithium complexation the color of solution changes from pale yellow to brownish red, the color density being dependent on lithium ion concentration.
Preparation and Properties of a Novel Heterocyclic Dispiro Compound, 3,10-Diaza-N,N-dimethyldispiro[5.0.5.3]pentadeca-1,4,8,11-tetraene
Authors: Muramatsu Takashi , Toyota Azumao , Ikegami Yusaku , Onodera Shinji , Hagiwara Hisahiro
Published: March 2006

Two-electron reduction of 4,4′-(1,3-propanediyl)bis(N-methylpyridinium) dibromide with sodium amalgam in degassed solvent affords the titled compound, which is characterized by means of NMR, mass, ESR, and UV-vis absorption spectroscopies. Under deoxygenated conditions, the dispiro compound is stable for a long time at room temperature, but undergoes a decomposition reaction at high temperatures above 200 °C to give several degradation products.
Electroluminescent Poly(arylene ether) Containing Both Hole-Transporting and Electron-Transporting Units
Authors: Kido Junji , Harada Gaku , Nagai Katsutoshi
Published: March 2006

A poly(arylene ether) containing hole-transporting tetraphenylbenzidine units and electron-transporting 1,3,4-oxadiazole units was synthesized and examined as an emitter layer in organic electroluminescent device. The device structure of glass substrate / indium-tin oxide / polymer / Mg:Ag was employed. The EL device exhibited blue green light originating from the polymer emitter layer with a maximum luminance of 26 cd/m2 at 12 volt.
Direct Observation of Thiol Ester Formation between an Enzyme and an Active Site Directed Inhibitor by FT-IR
Authors: Kawasaki Takayasu , Fujioka Yuji , Saito Koji , Ohta Hiromichi
Published: March 2006

FT-IR measurement disclosed a formation of a thiol ester bond between a cysteine of arylmalonate decarboxylase and an active site directed inhibitor, α-bromophenylacetate, strongly suggesting that the enzyme initially activates the substrates in a similar mechanism.
Synthesis of Closely Spaced Porphyrin-Fullerene
Authors: Imahori Hiroshi , Sakata Yoshiteru
Published: March 2006

A porphyrin-linked fullerene where a C60 moiety is covalently linked to the meso position of 5,15-diarylporphyrin with a pyrolidine spacer was prepared. 1H NMR, electronic absorption, and electrochemical studies show that there is a considerable interaction between the two chromophores.
The Effects of High Magnetic Field on the Deposition of Silver
Authors: Katsuki Akio , Watanabe Shin-ichi , Tokunaga Ryoko , Tanimoto Yoshifumi
Published: March 2006

Deposition of silver was observed under a high gradient magnetic field. When a copper wire was placed on a piece of filter paper which was wet with silver nitrate aqueous solution (0.5 mol dm−3), the deposition of silver grew uniformly around the wire at zero field. In the presence of the magnetic field (Bmax = 8 T), the area of the deposition at the center of the magnetic field decreased. Diffusion of ions generated in the reaction seems to be affected by the high gradient field.
Selective Hydrogenation of Phenylacetylene Using Block Copolymer Additional Poisoning Agent
Authors: Dhamodharan R
Published: March 2006

A block copolymer, poly (styrene-block-4-vinylpyridine) is used as an additional poisoning agent in combination with Lindlar’s catalyst to drastically affect the selectivity in the semi-hydrogenation of phenylacetylene. Selectivity is demonstrated from gas chromatography data. The extra advantage in terms of preparing poisoning agent free, very pure and dry monomer are illustrated.
Enzyme Ultra-thin Layer Electrode Prepared by the Co-adsorption of Poly-l-lysine and Glucose Oxidase onto a Mercaptopropionic Acid-Modified Gold Surface
Authors: Mizutani Fumio , Sato Yukazi , Yabuki Soichi , Hirata Yoshiki
Published: March 2006

An ultra-thin layer containing immobilized glucose oxidase was produced through the co-adsorption of the enzyme and poly-l-lysine onto a mercaptopropionic acid-modified gold electrode. The enzyme molecules were considered to be entrapped in a cross-linked matrix consisting of the carboxylic acid on the electrode and the cationic polymer.
Photochemical Polymerization of Dithienothiophenes
Authors: Fujitsuka Mamoru , Sato Tadatake , Watanabe Akira , Ito Osamu , Shimidzu Takeo
Published: March 2006

Photochemical polymerizations of dithienothiophenes were investigated. Photo-irradiation to the solution containing dithienothiophene and appropriate electron acceptor gave poly-dithienothiophene having ca. 104 (vs. PSt.) of molecular weight. The cation radical of the monomer was efficiently generated through photoinduced electron transfer from the excited state of the monomer to the electron acceptor. Then the successive coupling reaction resulted in a formation of the polymers.
A Comparison between the Structures of Tungstopterin Cofactor in Tungsten Oxidoreductase and a Model Complex, cis-Dioxobis(2,3-napthalenedithiolate)tungsten(VI) in Their O-Atom Transfer Reaction
Authors: Oku Hiroyuki , Ueyama Norikazu , Nakamura Akira
Published: March 2006

In our study on an active site model of tungsten oxidoreductase, structural parameters of oxo and thiolate ligands in (NEt4)2[WVIO2(S2C10H6)2]·H2O (1) (S2C10H6 = 2,3-napthalenedithiolato) were obtained where two dithiolene like coordination exists. A comparison of the structure with the enzyme active site indicated the importance of “least stereochemical movement” of thiolate ligands.
Ring-Opening Reactions of anti-Dodecaisopropyltricyclo[4.2.0.02,5]octasilane. Formation of Novel Bicyclo[3.3.0]octasilane and Bicyclo[4.2.0]octasilane Systems
Authors: Kyushin Soichiro , Sakurai Haruaki , Yamaguchi Hiroyuki , Matsumoto Hideyuki
Published: March 2006

The reaction of anti-dodecaisopropyltricyclo[4.2.0.02,5]octasilane (1) with PdCl2(PhCN)2 gave bicyclo[3.3.0]octasilane(trans-2) and bicyclo[4.2.0]octasilane (trans-3). In the reaction of 1 with PCl5, only the bicyclo[4.2.0]octasilanes (cis-3 and trans-3) were formed. The structures of the novel rings, trans-2, cis-3, and trans-3, were investigated by X-ray crystallography.
Total Synthesis of GD3, A Ganglioside
Authors: Kondo Tadao , Tomoo Toshiyuki , Abe Hiroyuki , Isobe Minoru , Goto Toshio
Published: March 2006

On the basis of new methodology involving α-stereocontrolled sialylation using our 2-halo-3β-phenylthio-Neu5Ac and construction of Neu5Ac(α2-8)Neu5Ac due to differential reactivity between 2-chloro and 2-fluoro-Neu5Ac, we realized an efficient total synthesis of GD3.
AgOTf-Promoted Conversion of 4,5-Epoxy-1-bromide into Tetrahydropyran Ring
Authors: Hayashi Nobuyuki , Fujiwara Kenshu , Murai Akio
Published: March 2006

trans-1-Bromo-8-t-butyldiphenylsiloxy-4,5-epoxyoctane was treated with AgOTf in THF/H2O (5:1) to give trans-3-hydroxytetrahydropyran derivative as the major product (72%) by the expansion of the oxirane ring.
Cadmium Chloride-Zinc Catalysed Selective Reduction of Nitro Aromatics to Azoxy Compounds
Authors: Baruah Bipul , Boruah Anima , Prajapati Dipak , Sandhu Jagir S
Published: March 2006

Treatment of aromatic nitro compounds with cadmium chloride-metallic zinc combination systems has been shown to display a good reaction selectivity in the formation of symmetrical azoxy compounds in high yields.
Functionalization of C60 with 1,3-Nitrilimine Dipole: Synthesis of 2-Pyrazoline Ring-Fused C60 Derivatives
Authors: Matsubara Yoshio , Muraoka Hiroki , Tada Hideki , Yoshida Zen-ichi
Published: March 2006

Pyrazoline ring-fused C60 derivatives (1, 2 and 3) as an example of monofunctionalized C60 with heterocycle are synthesized by using the dipolar cycloaddition. The reaction of 1,3-nitrilimine with C60 takes place readily to provide the target monoadduct together with the di- and triadducts in good total yields. Based on the fluorescent and electrochemical characteristics, features of pyrazoline ring-fused C60 are briefly discussed.
Direct Crystallization of Amorphous Silicates to Zeolites in Solid State
Authors: Shimizu Shinichi , Kiyozumi Yoshimichi , Mizukami Fujio
Published: March 2006

A silicate monolithic gel was prepared by the hydrolysis of tetraethyl orthosilicate with tetrapropylammonium hydroxide aqueous solution. The starting powder obtained by drying the gel was converted to zeolite ZSM-5 by heating at 130 °C for 18 h. Silicalite-1 and silicalite-2 were also obtained by the similar conversion. A binderless zeolite disk was obtained by heating a disk shaped with the starting powder.
Synthesis and Properties of Alkylthio-Substituted Tris-Fused Tetrathiafulvalenes
Authors: Nishikawa Hiroyuki , Kawauchi Susumu , Misaki Yohji , Yamabe Tokio
Published: March 2006

Several derivatives of title donors (1a-c) have been synthesized. The cyclic voltammogram of tetrakis(hexylthio) derivative 1c exhibited three pairs of double-electron transfer waves. The iodine complexes of 1a-c showed relatively high conductivities of 10−1 - 101 S cm−1 at room temperature.
A New Furostanol Saponin with Six Sugars from the Bulbs of Allium sphaerosephalon Structural Elucidation by Modern NMR Techniques
Authors: Mimaki Yoshihiro , Satou Tadaaki , Kuroda Minpei , Kameyama Aiko , Sashida Yutaka , Li Hong-yu , Harada Nobuyuki
Published: March 2006

A new bisdesmosidic furostanol saponin with six monosaccharides (1) was isolated from the bulbs of Allium sphaerosephalon. The structure was determined by the concerted use of modern NMR techniques. The corresponding spirostanol saponin (2) of 1 showed cytotoxic activity against leukemia MOLT-4 cells, while 1 was inactive.
Characterization of Dyestuff-containing Liposome by Capillary Zone Electrophoresis Using On-line Chemiluminescence Detection
Authors: Tsukagoshi Kazuhiko , Akasaka Hideshi , Nakajima Riichiro , Hara Tadashi
Published: March 2006

Eosin Y-containing liposome solution as a sample was migrated and detected by capillary zone electrophoresis for the first time with a chemiluminescence detection using peroxyoxalate system. Two peaks were recorded on the electropherogram; the first one was due to Eosin Y entrapped in liposome and the second one due to free Eosin Y in the bulk solution. The electropherogram comprising the two peaks offered various informations of liposome, such as size distribution, stability, permeability, or surface charge.
Molecular Organization of Mono(p-hydroquinonyl)porphyrin through Coordinate Bond
Authors: Miyaji Hidekazu , Kobuke Yoshiaki , Kondo Jiro
Published: March 2006

Mono(p-hydroquinonyl)tritolylporphyrin and its magnesium complex were prepared. Molecular organization of the magnesium complex in solution was examined by using 1H-NMR spectroscopy.
Novel Catalysts Effective for Dehydrofluorination of CF3CH3 (HFC143a) into CF2CH2
Authors: Li Gong-Liang , Ishihara Tatsumi , Nishiguchi Hiroyasu , Moro-oka Yoshihiko , Takita Yusaku
Published: March 2006

The catalytic dehydrofluorination of CF3CH3 into CF2CH2 was studied over various metal phosphates in a fixed-bed reactor. The Mg2P2O7 catalyst exhibited moderate activity, higher selectivity and greater stability. The active sites for CF2CH2 formation are weak acid sites of the catalysts.
Selective Transport of Alkali Metal Ions Across Black Lipid Membranes (BLM) Composed of Ionophilic Amphiphiles
Authors: Kimizuka Nobuo , Wakiyama Tatsuo , Kunitake Toyoki
Published: March 2006

Transport of alkali-ions across black lipid membranes (BLM) formed from cationic and anionic, double-chain amphiphiles was characterized by the charge pulse relaxation technique. Amphiphiles containing an ether linkage in the alkyl tail portion displayed enhanced transport rates for sodium and potassium ions, while such selectivity is not observed for the related amphiphile without the ether linkage.
Energy Transfer Luminescence of Tb3+ Complexed with Oxyethylene Compounds Containing Xanthene
Authors: Suzuki Yoshio , Morozumi Tatsuya , Kakizawa Yusuke , Bartsch Richard A , Hayashita Takashi , Nakamura Hiroshi
Published: March 2006

Three polyether compounds (1-3) which have more than two fluorescent moieties in the both terminals were synthesized, and their complexation properties with Tb3+ were discussed. After formation of complex with Tb3+, sharp fluorescence lines were observed at visible region due to intramolecular energy transfer from xanthene chromophore to bound Tb3+. The correlation between energy transfer efficiency and ligand structure for three analogous compounds were investigated.
New Homo-coupling Reaction of Alkyl, Aryl, Vinyl, and Allyl Grignard Reagents Using Trifluoromethanesulfonic Anhydride
Authors: Nishiyama Tomihiro , Seshita Takeshi , Shodai Hiroshi , Aoki Kazushige , Kameyama Hideaki , Komura Kenichi
Published: March 2006

Homo-coupling reaction of various alkyl, aryl, vinyl, and allyl Grignard reagents with trifluoromethanesulfonic anhydride provides a simple and straightforward method for the syntheses of symmetrical carbon-carbon coupling products under mild conditions and in moderate to good yields.
Porous Aggregates of Unidirectionally Oriented (NH4)3PW12O40 Microcrystallites: Epitaxial Self-Assembly
Authors: Inumaru Kei , Nakajima Hitoshi , Ito Takeru , Misono Makoto
Published: March 2006

Microcrystallites of (NH4)3PW12O40 self-assembled to form symmetric dodecahedral aggregates (ca. 0.5–6 μm in size) in which the microcrystallites joined together with the same crystal orientation, by controlled deposition of NH4 salts from a heated aqueous solution of H3PW12O40. These aggregates were highly porous, where microcrystallies were connected each other by epitaxial interfaces.
Copper Mediated Conversion of Nitro Compounds to Aldehydes or Ketones by Dioxygen
Authors: Balogh-Hergovich Éva , Kaizer József , Speier Gábor
Published: March 2006

Primary and secondary nitro compounds are easily transformed to aldehydes of ketones by dioxygen catalyzed by metallic copper.
Novel Low-molecular-weight Organic Gels: N,N′,N″-Tristearyltrimesamide/Organic Solvent System
Authors: Yasuda Yoshiaki , Iishi Eiichi , Inada Hiroshi , Shirota Yasuhiko
Published: March 2006

A novel class of low-molecular-weight organic gels has been developed; N,N′,N″-tristearyltrimesamide (TSTA) forms gels with various organic solvents, immobilizing solvent at a low concentration of TSTA. The gels, which form fibrous bundles leading to three-dimensional networks, exhibit well-defined sol-gel transitions. Both intermolecular hydrogen bonding and intermolecular inteactions between long alkyl chains are suggested to be responsible for the formation of gels.
Template Synthesis of Phenol-based Heterodinucleating Macrocycles with Dissimilar N(amine)2O2 and N(imine)2O2 Metal-binding Sites
Authors: Yonemura Masami , Matsumura Yukiko , Ohba Masaaki , Okawa Hisashi , Fenton David E
Published: March 2006

Phenol-based dinucleating macrocycles possessing two dissimilar N(amine)2O2 and N(imine)2O2 metal-binding sites, sharing two phenolic oxygens, have been obtained as mononuclear Cu(II) complexes, capable of incorporating a second metal ion to provide homo- and hetero-dinuclear complexes.
A Novel Tetranuclear Iron(III) Complex Having l-Alanine Bridges and an Unprecedented (Fe4(O2H) Core
Authors: Yano Shigenobu , Inagaki Tomoko , Yamada Yasuko , Kato Masako , Yamasaki Mikio , Sakai Ken , Tsubomura Taro , Sato Mitsunobu , Mori Wasuke , Yamaguchi Kazuya , Kinoshita Isamu
Published: March 2006

The reacion of l-alanine (l-ala) with Fe(NO3)2·9H2O in the presence of H5dhpta (1,3-diamino-2-hydroxypropane-N,N,N′,N′-tetraacetic acid) and base (NaOH) affords the novel tetranuclear complex Na[Fe4(dhpta)2(O)(OH)(l-ala)2]·6H2O having l-alaninato bridges and an (Fe4(O2H))9+ core whose crystal structure and magnetic properties were determined.
A Coupling Wave Optical Waveguide Chemical Sensor Constructed by Combining the Ion-exchange and the Sol-gel Methods
Authors: Qing De-Kui , Itoh Kiminori , Murabayashi Masayuki
Published: March 2006

A coupling wave optical waveguide sensor was proposed, and realized by combining the ion-exchange and the sol-gel methods. The new optical waveguide (OWG) sensor is based on a stacked slab optical waveguide codirectional coupler, and proved to be advantageous over conventional OWG sensors. A gas sensor fabricated as an example easily detected 5 ppm H2S.
New Narrow-Bandgap Polymers Composed of [1,2,5]Thiadiazolo[3,4-g]quinoxaline and Aromatic Heterocycles
Authors: Kitamura Chitoshi , Tanaka Shoji , Yamashita Yoshiro
Published: March 2006

Polymers Composed of [1,2,5]thiadiazolo[3,4-g]quinoxaline and either thiophene or N-methylpyrrole were synthesized by electrochemical polymerization and showed bandgaps of about 0.7 eV.
Microwave Assisted Synthesis of S-Trityl and S-Acylmercaptoalkanols, Nucleosides and Their Deprotection
Authors: Kumar P , Gupta K C
Published: March 2006

Simple and high yielding methods for the synthesis and deprotection of S-trityl and S-acylhexanols and appropriately protected 2′-deoxynucleosides in solvent and dry media conditions are described which occur under mild conditions using microwave irradiation.
Photochemistry of π-Complexes of Chlorine Atom with Methyl- and Ethyl-Substituted Benzenes
Authors: Feng Wu , Sumiyoshi Takashi , Yamashita Yuichiro , Shindo Toshihiko , Sawamura Sadashi
Published: March 2006

The photochemistry of π-complexes of the chlorine atom with a series of methyl- and ethyl-substituted benzenes has been investigated using combined pulse radiolysis-laser flash photolysis techniques. Direct photolysis of π-complexes in carbon tetrachloride causes photobleaching by intramolecular hydrogen abstraction with quantum yields of 0.05–0.15 depending on the substituents but not on the positions of them.
Reactivity of the Si-C Bond of [1]Silaferrocenophane: Palladium-Catalyzed Dimerization and Oxidative Addition to a Pt(0) Complex
Authors: Reddy Nagavelli Prabhakar , Choi Nami , Shimada Shigeru , Tanaka Masato
Published: March 2006

[1]Silaferrocenophanes (1) underwent dimerization reaction in the presence of palladium-trialkylphosphine complexes. A mechanistically-related [2]platinasilaferrocenophane complex was formed when 1 was treated with Pt(PEt3)3.
Dichroism of π-Conjugated Poly(quinoxaline-5,8-diyl)s in Stretched Poly(vinyl alcohol) Film and Photoluminescence of the Polymer
Authors: Yamamoto Takakazu , Lee Bang-Lin
Published: March 2006

Poly(quinoxaline-5,8-diyl)s exhibit two π-π* absorption bands, and one of the two absoption bands is assigned to a π-π* transition occurred along the direction of the polymer main chain from their dichroism. Photoluminescence of the polymer suggests intramolecular energy transfer.
Magnetic Field Effects on Photoelectrochemical Responses of Modified Electrodes with Porphyrin-Viologen Linked Compound as Langmuir Blodgett Film
Authors: Yonemura Hiroaki , Ohishi Kei , Matsuo Taku
Published: March 2006

Modified electrodes were fabricated by depositing a monolayer containing porphyrin-viologen linked compound on ITO electrodes by Langmuir-Blodgett method. Visible light irradiation on the modified electrodes afforded stable anodic photocurrents. The photocurrents clearly increased in the presence of magnetic fields. The magnetic field effects on photocurrents, as observed for the first time, are ascribed to the contribution of triplet radical pairs.
Drawing Fine Patterns with Cross-Linkable Polymer Langmuir-Blodgett Film
Authors: Aoki Atsushi , Nakaya Masakazu , Miyashita Tokuji
Published: March 2006

Langmuir-Blodgett (LB) films of copolymer (1) consisting of N-dodecylacrylamide (DDA), and cross-linkable group, N-ω-acryloylundecyl-4-vinylpyridinium salt has been prepared. On UV irradiation, the cross-linking reaction occurs efficiently giving uniform two dimensional cross-linked polymer LB films with a high stability against solvents. The photolithographic property of the LB film are applicable to a new type of high resolution negative photoresists.
Cytochrome c Cross-linked with Glutaraldehyde (1); Electrochemical Response in Poly(ethylene oxide) Oligomers
Authors: Ohno Hiroyuki , Kurusu Fumiyo
Published: March 2006

For rapid electron transfer of cytochrome c(cyt.c) in poly(ethylene oxide)(PEO) oligomers, higher-ordered structure of cyt.c was cross-linked intramolecularly with glutaraldehyde, and the redox reaction of this cyt.c was analyzed. The cross-linked cyt.c was soluble in PEO oligomers and showed better electrochemical redox response than PEO-modified cyt.c. Little conformational change of the cross-linked cyt.c was suggested even after adsorption on the electrode.
Fluorescence Enhancement Observed in Tetra-aza Macrocycles by Lithium Complexation
Authors: Ogawa Shojiro , Tsuchiya Shinji
Published: March 2006

The fluorescence spectra of tetra-aza macrocycles containing pyridine rings and their lithium complexes were measured and specific fluorescence behaviors were found. That is, the complexation of tetra-aza macrocycle with lithium ion dramatically enhances the fluorescence intensity (over 1100 fold).