bluuebunny/crossref_metadata_2025_split huggingface dataset:
Controlled Growth of Polypyrrole Thin Films by Polymerization-induced Adsorption
Authors: Ichinose Izumi , Miyauchi Haruko , Tanaka Masayoshi , Kunitake Toyoki 
Published: March 2003

Abstract
Ultrathin polypyrrole films with a nanometer thickness were prepared by repeating adsorption of polypyrrole from the polymerization solution and washing with organic solvents. The thickness of the polypyrrole film linearly increased by using fresh polymerization mixtures at each adsorption step, as confirmed by quartz crystal microbalance and UV spectroscopy.
Reaction of a Zirconocene-Ethylene Complex with Group 14 Metal Chlorides or Alkoxides
Authors: Ura Yasuyuki , Hara Ryuichiro , Takahashi Tamotsu 
Published: March 2003

Abstract
A zirconocene-ethylene complex Cp2Zr(CH2=CH2)(PMe3) reacted with R3EX (E=Si, Ge, Sn; R=Ph or Bu; X=Cl, OEt, or OER3) to give R3EEt in high yields after hydrolysis. The reaction mixture of the ethylene complex with Bu3SnCl further reacted with phenylacetylene to give homoallyltin compounds. When the reaction mixture was treated with Ph3SnCl or Ph3GeCl instead of phenylacetylene, Ph3SnEt or Ph3GeEt was obtained in high yields after hydrolysis via the replacement of the β-SnBu3 moiety.
Effect of ZrO2 on the Stability of Cu-ZnO-ZrO2/HZSM-5 Catalyst for Syngas Conversion to Dimethyl Ether
Authors: Ge Qingjie , Huang Youmei , Li Shuben 
Published: March 2003

Abstract
The stability of Cu-ZnO/HZSM-5 and Cu-ZnO-ZrO2/HZSM-5 catalysts for syngas conversion to dimethyl ether has been evaluated using a fixed-bed flow microreactor at 290 °C, 40 atm, 1500 h−1. ZrO2 addition showed a marked improvement in the stability of catalyst.
Hydrolytic Function of a Hydroxo-ZnIIPbII Complex toward Tris-p-nitrophenyl Phosphate: A Functional Model of Heterobimetallic Phosphatases
Authors: Yamami Masako , Furutachi Hideki , Yokoyama Takushi , Okawa Hisashi 
Published: March 2003

Abstract
A ZnIIPbII complex ZnPb(L)(H2O)2(ClO4)2 of a macrocyclic compartmental ligand L2− is converted under alkaline conditions into a hydroxo complex ZnPb(L)(OH)(H2O)ClO4 that hydrolyzes tris-p-nitrophenyl phosphate (TNP) to bis-p-nitrophenyl phosphate (BNP−) forming a BNP-bridged complex [ZnPb(L)(BNP)]ClO4.
First Synthesis and Structure of Hexavalent Organic σ-Perselenurane Species (λ6-Selane): Bis(2,2′-biphenylylene)difluoroperselenurane [12-Se-6(C4F2)]
Authors: Sato Soichi , Arakawa Hiroshi , Horn Ernst , Furukawa Naomichi 
Published: March 2003

Abstract
Bis(2,2′-biphenylylene)selenurane (1; λ4-selane) reacts with xenon difluoride to give bis(2,2′-biphenylylene)difluoroperselenurane, [12-Se-6(C4F2)] (2; λ6-selane), which was analyzed by single crystal X-ray diffraction.
Preparation of New Fibrous Layered Compounds by the Reaction of Zinc Hydroxide with Organic Compounds
Authors: Ogata Sumikazu , Tasaka Yoshiharu , Tagaya Hideyuki , Kadokawa Jun-ichi , Chiba Koji 
Published: March 2003

Abstract
Organic-inorganic layered nano-hybrids were prepared by the reactions of amorphous Zn(OH)2 with organic oxychlorides and organic carboxylic acids, and fibrous layered compounds were obtained by the reaction with bulky organic compounds.
Reactions of Tetracyanoethylene Oxide (TCNEO) with Cobaltadithiolene Complexes
Authors: Takayama Chikako , Takeuchi Keiko , Kajitani Masatsugu , Sugiyama Toru , Sugimori Akira 
Published: March 2003

Abstract
The reactions of cobaltadithiolene complexes bearing phenyl or ester ligands with tetracyanoethylene oxide (TCNEO) result in the formation of dicyanomethylene-bridged complexes, via dicyanomethylide intermediates. Furthermore, the reaction of cobaltadithiolene complex bearing 4-pyridyl ligands produces pyridinium dicyanomethylide complexes in good yields.
Si X-Ray Absorption Near Edge Structure(XANES) in X-Ray Fluorescence Spectra
Authors: Kawai Jun , Hayashi Kouichi , Okuda Kazuaki , Nisawa Atsushi 
Published: March 2003

Abstract
Silicon K X-ray fluorescence spectra of Si and SiO2 single crystals are measured using a wave dispersive X-ray fluorescence spectrometer. It is demonstrated that the fine structures in the line shape of the low energy tail of the Kα characteristic X-ray fluorescence spectra resemble those of the K X-ray absorption near edge structure(XANES).
Catalysis by Solid Acid: Selective Diels-Alder Reactions Are Promoted by Mesoporous Aluminosilicate with Zinc Ions and Nanometer Honeycomb Openings
Authors: Onaka Makoto , Yamasaki Ryota 
Published: March 2003

Abstract
Zinc ion-exchanged mesoporous aluminosilicate has been designed specifically to accelerate the Diels-Alder reaction between cyclopentadiene and poor dienophiles such as methyl acrylate and methyl methacrylate. Catalysis on this aluminosilicate is more effective than on a K 10-based solid acid catalyst.
Synthesis and Helical Twisting Power of Optically Active 2-Methylchroman-2-carboxylic Acid Derivatives as New Chiral Dopants for Nematic Liquid Crystals
Authors: Shitara Hiroaki , Aoki Yoshio , Hirose Takuji , Nohira Hiroyuki 
Published: March 2003

Abstract
Optically active 2-methylchroman-2-carboxylic acid derivatives as new chiral dopants for nematic liquid crystals were prepared from optically active 6-benzyloxy-2-methylchroman-2-carboxylic acid, which was newly synthesized and resolved by diastereomeric salt formation method. The helical twisting power of the dopants was determined and the relationship with their structures were studied.
Platinum-added Sulfated-zirconia Effective for Highly Selective Dehydrogenative Coupling of Methane
Authors: Kurosaka Tadahiro , Matsuhashi Hiromi , Arata Kazushi 
Published: March 2003

Abstract
An active and stable catalyst of 3 wt% Pt-added sulfated-zirconia for the dehydrogenative coupling of methane is obtained by impregnating zirconia gel with 0.5 mol dm−3 H2SO4 followed by drying, impregnating the sulfated gel with a solution of H2PtCl6, calcining in air at 600 °C, and finally reducing in H2 at 500 °C; this catalyst gave 40% conversion of the equilibrium value with 100% selectivity at 500 °C.
Effects of Substituents on Silicon upon the Ring Inversion of Silepins Annelated with Bicyclo[2.2.2]octene Frameworks
Authors: Nishinaga Tohru , Izukawa Yoshiteru , Komatsu Koichi 
Published: March 2003

Abstract
The energy barrier for ring inversion of the silepin annelated with bicyclo[2.2.2]octene was found to decrease as the electro-negativity of substituents on silicon increases.
Extended Network via Axial Cu-Br Linkages of Zig-zag Coordination Chains of Copper(II) Ions Bridged Alternately by trans-Oxamidate and End-on Azide Groups
Authors: Chen Zhong-Ning , Zhang Hua-Xin , Yu Kai-Bei , Kang Bei-Sheng 
Published: March 2003

Abstract
The zig-zag coordination chains [Cu2(trans-oxen)(N3)(Br)]n[H2oxen=N,N′-bis(2-aminoethyl)oxamide] with alternating bridges of trans-oxamidate and azide in bis-terdentate and end-on mode, respectively, are held together via axial Cu-Br linkage in a unique fashion to form an extended structure.
A Mechanistic Study of Thermal and Photochemical Isomerization between Hexasilyltetrasilabicyclo[1.1.0]butane and Hexasilyltetrasilacyclobutene
Authors: Iwamoto Takeaki , Kira Mitsuo 
Published: March 2003

Abstract
Thermal isomerization of hexakis(t-butyldimethylsilyl)tetrasilabicylo[1.1.0]butane (2) to the corresponding tetrasilacyclobutene (1) as well as photochemical isomerization of 1 to 2 was confirmed using substituent-labeling experiments to proceed via 1,2-silyl-migration instead of skeletal isomerization.
Dielectrophoretic Separation of Single Microparticles with Quadrupole Microelectrode
Authors: Watarai Hitoshi , Sakamoto Takashi , Tsukahara Satoshi 
Published: March 2003

Abstract
In a microcell with a two-dimensional quadrupole microelectrode, polystyrene particles showed positive and negative dielectrophoresis (DEP) in lower (1 k-18 kHz) and higher (32 k-1 MHz) ac frequency regions, respectively, whereas only positive DEP was observed for carbon particles in a whole region of 1 k-1 MHz frequency. These findings were quantitatively explained by the difference in the conductivity of both particles. A DEP separation between the two kinds of particles was attained at a 1 MHz frequency.
Total Asymmetric Synthesis of Taxol by Dehydration Condensation between 7-TES Baccatin III and Protected N-Benzoylphenylisoserines Prepared by Enantioselective Aldol Reaction
Authors: Shiina Isamu , Saitoh Katsuyuki , Fréchard-Ortuno Isabelle , Mukaiyama Teruaki 
Published: March 2003

Abstract
Total asymmetric synthesis of Taxol was completed by dehydration condensation between a protected N-benzoylphenylisoserine 4 or 9 and 7-TES baccatin III which was prepared from 8-membered ring enone. Taxol side chains 4, 7, 9 and 11, optically active protected N-benzoylphenylisoserines, were successfully synthesized by enantioselective aldol reaction from two achiral starting materials, benzaldehyde and an enol silyl ether derived from S-ethyl benzyloxyethanethioate.
Unusual Formation of Cyclometallated C,H-trans-Hydridoruthenium(II) Complexes and Their Isomerization into C,H-cis-Types
Authors: Hiraki Katsuma , Koizumi Makoto , Kira Shu-ichi , Kawano Hiroyuki 
Published: March 2003

Abstract
The aromatic C-H bonds of N-benzylideneaniline and 2-phenylpyridine are cleaved by [RuH2(CO)(PPh3)3] and triethoxyvinylsilane at 70-110 °C to give the corresponding cyclometallated hydridoruthenium(II) complexes. The X-ray structure analyses of these complexes reveal that the hydrido ligand is initially situated trans to aryl group of the cyclometallated moiety and these two ligands are moved mutually into cis-sites by heating.
A Facile Synthesis of 1β-Methylcarbapenem Skeleton Utilizing Cyclization of α,β-Unsaturated Ester with Methanesulfenyl Chloride
Authors: Hayakawa Ryuuichirou , Fuseya Ichiro , Konagaya Tomohiro , Shimizu Makoto , Fujisawa Tamotsu 
Published: March 2003

Abstract
A facile synthetic route to 1β-methylcarbapenem skeleton is described utilizing cyclization of α,β-unsaturated ester with methanesulfenyl chloride.
Post-source Decay Fragment Analysis of a Highly Branched Nonasaccharide of Xyloglucan Using MALDI-TOF Mass Spectrometry
Authors: Yamagaki Tohru , Mitsuishi Yasushi , Nakanishi Hiroshi 
Published: March 2003

Abstract
A highly branched nonasaccharide of xyloglucan was analyzed by MALDI-TOFMS post-source decay fragment analysis. The fragmentation occurred only at glycosidic bonds at the non-reducing terminal side of the glycosidic oxygen. In the MALDI-PSD fragment spectrum, almost all fragment ions, possibly produced by a three-site cleavage, were observed. The large amount of fragment mass information allowed us to determine the sequentially fine structure of the highly branched oligosaccharide.
Novel Oxygen Sensor Based on Quenching of Triplet-Triplet Absorption of Zinc Tetraphenylporphyrin
Authors: Furuto Takao , Lee Sang-Kyung , Asai Keisuke , Okura Ichiro 
Published: March 2003

Abstract
A novel oxygen sensor based on the quenching of triplet-triplet absorption of zinc tetraphenylporphyrin (ZnTPP) molecules by oxygen has been developed. The excited triplet lifetime of ZnTPP-PS film decreases as increasing of oxygen concentration. This sensor showed linear Stern-Volmer plots and was capable of oxygen measurement.
Flaky, Ultrathin Mesoporous Silica Laminas
Authors: Singh Puyam S , Kosuge Katsunori 
Published: March 2003

Abstract
Flaky, ultrathin mesoporous silica laminas with uniform mesopores, have been synthesized by hydrolysis of acidic tetraethylorthosilicate solution with dodecylamine or, decylamine surfactant. The materials have BET surface areas of 600-850 m2/g and mesopore diameters of ca. 3-4 nm after the samples were calcined at 500 °C.
Synthesis of the Aglycon of Aurisides A and B, Cytotoxic Macrolide Glycosides of Marine Origin
Authors: Sone Hiroki , Suenaga Kiyotake , Bessho Yuhki , Kondo Takashi , Kigoshi Hideo , Yamada Kiyoyuki 
Published: March 2003

Abstract
The synthesis of the aglycon of aurisides A and B was achieved from (R)-pantolactone in 29 steps using the Nozaki reaction and the Yamaguchi macrolactonization as key steps.
Syntheses, Structures, and Insulin-like Activities of Two Vanadyl Complexes; [VO(GeG)(H2O)] and [VO(MeM)(H2O)]
Authors: Kawabe Kenji , Tadokoro Makoto , Kojima Yoshitane , Fujisawa Yae , Sakurai Hiromu 
Published: March 2003

Abstract
We prepared [VO(GeG)(H2O)] and [VO(MeM)(H2O)] by a reaction of VOSO4 with GeG and MeM. X-ray analyses of the complexes showed that a tetradentate ligand (GeG or MeM), an oxygen atom, and a water molecule were coordinated with the vanadium(IV) ion forming distorted octahedral geometries. In in vitro evaluation using isolated rat adipocytes, VO(GeG) (IC50=0.42 mM) was found to be more active at lower concentrations than VO(MeM)(IC50=17.0 mM) and VOSO4 (IC50=6.0 mM) in terms of IC50 values, 50% inhibition concentration of the FFA release from adipocytes.
Substituent Effects on the Chemiluminescent Properties of Coelenterazine Analogues
Authors: Saito Ryota , Hirano Takashi , Niwa Haruki , Ohashi Mamoru 
Published: March 2003

Abstract
Chemiluminescence maxima and quantum yields of coelenterazine analogues possessing a substituent R [=CF3, F, H, OCH3, OH, N(CH3)2] at the para-position on the 6-phenyl group were measured in DMSO. The result indicates that the variation of the electronic properties of R of these analogues caused the small change of the efficiency of chemical generation of a singlet excited light-emitter (Φs).
Novel Ring System with an Se–O–N Linkage: Synthesis and Crystal Structure of the First 1,2λ4,5-Oxaselenazolidine
Authors: Kano Naokazu , Nakanishi Nobuhito , Daicho Yuya , Kawashima Takayuki 
Published: March 2003

Abstract
Oxidation of β–aminoalkyl selenide 4a with an excess amount of mCPBA gave 1,2λ4,5-oxaselenazolidine 1, a novel heterocyclic compound with an Se–O–N linkage. Its X-ray crystallographic analysis revealed that the oxaselenazolidine ring has an envelope conformation.
Synthesis and Catalysis of Ti-MCM-41 Materials with Organic–Inorganic Hybrid Network
Authors: Yamamoto Katsutoshi , Nohara Yuki , Tatsumi Takashi 
Published: March 2003

Abstract
Ti-Containing MCM-41 materials were organically modified by employing an organosilane with a bridging organic group between two Si, and employed as catalysts for olefin oxidation using H2O2 as oxidant. The incorporation of a bridging organic group resulted in an increase in d spacing, in contrast to the modification with organosilane having terminal alkyl group, which provides decreased d spacing. High hydrophobicity of organically bridged Ti-MCM-41 materials led to high selectivity to epoxide by depressing allylic oxidation.
O2-Adduct Complex of meso-Tetrakis(α,α,α,α-o-pivalamidophenyl)porphinatoiron(II) with an Intramolecularly Coordinated Proximal Histidine
Authors: Komatsu Teruyuki , Matsukawa Yasuko , Miyatake Kaoru , Tsuchida Eishun 
Published: March 2003

Abstract
meso-Tetrakis(α,α,α,α-o-pivalamidophenyl)porphinatoiron(II) with an intramolecularly coordinated proximal histidine forms a stable O2-adduct complex in benzene solution at 25 °C; the O2-binding affinity (P1/2: 1.7 Torr) is significantly low compared to that of the N-alkylimidazole bound analogue.
Solvothermal Synthesis of NiS2−xSex Nanocrystallines
Authors: Wang Chunrui , Tang Kaibin , Yang Qing , An Changhua , Qian Yitai 
Published: March 2003

Abstract
NiS2−xSex nanocrystallines (0 ≤ x ≤ 2) was successfully synthesized by solvothermal method at 180–200 °C. It was found that both temperature and solvent have important effects on the formation of NiS2−xSex nanocrystallines.
Mechanochemical Synthesis of Ternary Fluorides with Perovskite Structures
Authors: Lee Jaeryeong , Zhang Qiwu , Saito Fumio 
Published: March 2003

Abstract
Mechanochemical synthesis of ternary zinc fluorides, AZnF3 (A = K, Na and NH4) with perovskite structures was attempted by grinding equimolar mixtures of zinc fluoride (ZnF2) and one of fluorides, i.e., potassium fluoride (KF), sodium fluoride (NaF) and ammonium fluoride (NH4F), respectively, in air using a planetary ball mill. The grinding enables us to synthesize these compounds, and the crystallinity of them is improved as the grinding progresses. The synthesized materials formed in the ground mixtures seem to be agglomerates of fine particles having diameters of about several tens nanometer.
Norbornene-Derived Quinizarin Dye Molecules for Photoimaging in Polymer Film Based on Chemical Amplification
Authors: Lee Jae-Hyoung , Cho Iwhan , Ahn Kwang-Duk , Kim Jong-Man 
Published: March 2003

Abstract
A novel photoimaging process in thin films has been disclosed by taking advantage of photolithographic techniques based on chemical amplification concept. The key materials utilized in the process are norbornene-derived quinizarin dye molecules protected with acid-labile tert-butoxycarbonyl (t-Boc) blocking groups.
Cellulose 3,5-Dimethylphenylcarbamate Immobilized onto Silica Gel via Copolymerization with a Vinyl Monomer and Its Chiral Recognition Ability as a Chiral Stationary Phase for HPLC
Authors: Kubota Takateru , Kusano Toshiya , Yamamoto Chiyo , Yashima Eiji , Okamoto Yoshio 
Published: March 2003

Abstract
A new cellulose phenylcarbamate derivative having a vinyl group at the 6-position was synthesized and immobilized onto silica gel via radical copolymerization with styrene. The immobilization was efficiently attained using a small amount of styrene. The chiral recognition abilities of the immobilized chiral stationary phase (CSP) were similar to those of the CSP coated on silica gel.
Ring-Opening Reactions of Alkanone Acetals with Iodosilane Equivalents for the Formation of Siloxyalkyl Enol Ethers
Authors: Ohshita Joji , Iwata Arihiro , Tang Heqing , Yamamoto Yasushi , Matui Chinami , Kunai Atsutaka 
Published: March 2003

Abstract
Reactions of ketone acetals with iodosilane equivalents were studied. Treatment of alkanone ethylene acetals with a 1:2 mixture of Et2NSiMe3 and MeI afforded 2-siloxyethyl enol ethers in good yield. Benzophenone ethylene acetal underwent deprotection with the iodosilane equivalents, giving benzophenone.
A Hexagonally Organized Elemental Supramolecular Structure of a Sugar-Appended Organogelator Observed by Synchrotron X-ray Source (SPring-8)
Authors: Sakurai Kazuo , Kimura Taro , Gronwald Oliver , Inoue Katsuaki , Shinkai Seiji 
Published: March 2003

Abstract
Small angle X-ray scattering from methyl 4,6-O-benzylidene-α-d-mannopyranoside/p-xylene organogels was carried out with a synchrotron X-ray source at SPring-8, which revealed that the molecules assemble in a hexagonally packed motif in the gel state and this supramolecular structure completely disappears in the sol state.
Remarkable Thiocarbonyl and Ring-Size Effects on the Amide Bond Twisting
Authors: Yamada Shinji , Matsuda Kaori 
Published: March 2003

Abstract
Remarkable thiocarbonyl and ring-size effects on the amide bond twisting were observed for N-acetylamides 1–3. The amide linkage of 2 is perpendicularly twisted, whereas the oxygen analog 1 and five-membered analog 3 are virtually planar, which were revealed by 13C NMR and IR spectroscopies, and X-ray analysis.
3-Picoline Oxidation over Monoclinic Orthovanadate Cr0.5Al0.5VO4 Catalysts
Authors: Zhaoxia Song , Kadowaki Eriko , Shishido Tetsuya , Wang Ye , Takehira Katsuomi 
Published: March 2003

Abstract
Monoclinic orthovanadate CrVO4-I was found to be active for the vapor phase oxidation of 3-picoline to nicotinic acid and was further activated by the solid solution formation with Al at the Cr site.
New Negative-Type Photosensitive Polyimide Based on Hyperbranched Poly(ether imide), a Cross-Linker, and a Photoacid Generator
Authors: Okazaki Masaki , Shibasaki Yuji , Ueda Mitsuru 
Published: March 2003

Abstract
A new negative working photosensitive polyimide, based on hyperbranched poly(ether imide) (1), 4,4′-methylenebis[2,6-bis(hydroxymethyl)]phenol (2) as a cross-linker, and a photoacid generator diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (3) has been developed. 1 was prepared by polycondensation of N-[3,5-di-(tert-butyldimethylsilyloxy)phenyl]-4-fluorophthalimide (4), followed by deprotection of tert-butyldimethylsilyl group with KF-HBr. The photosensitive polyimide containing 1 (70 wt%), 2 (20 wt%) and 3 (10 wt%) gave a clear negative pattern when it was exposed to 365 nm light and postbaked at 120 °C, followed by developing with a 2.38 wt% aqueous tetramethylammonium hydroxide (TMAH) solution at room temperature.
Preparation and Properties of a Huge, Crystalline, and Water-Soluble Compound (C72H132N12Br6S12) That Possesses Six Carbenium Salt Units
Authors: Nakayama Juzo , Otani Toyohiro , Tadokoro Tomoko , Sugihara Yoshiaki , Ishii Akihiko 
Published: March 2003

Abstract
The reaction of hexakis(bromomethyl)benzene with six molar amounts of 2,2-bis(diethylamino)-2-ethylium-1-dithiocarboxylate furnished a huge, crystalline, and water-soluble compound (C72H132N12Br6S12, MW = 2030) that possesses six carbenium bromide units.
Solvothermal Synthesis to Nanocrystalline Ni0.85Se and NiSe2 at Low Temperature
Authors: Meng Zhaoyu , Peng Yiya , Xu Liqiang , Yu Weichao , Qian Yitai 
Published: March 2003

Abstract
Nanocrystalline Ni0.85Se and NiSe2 were prepared through the reaction between NiCl2·6H2O and elemental selenium at 50 °C, using N2H4·H2O as reductant and pyridine as solvent. TEM images showed that the Ni0.85Se and NiSe2 particles were both spherical in shape with sizes of about 20 nm. Solvent pyridine plays an important role in the formation of nanocrystalline nickel selenides due to its appropriate N-chelation ability and alkalescence.
Stellate Macroscopic Crystals from Cationic and Anionic Porphyrins
Authors: Yamaguchi Hiroyasu , Harada Akira 
Published: March 2003

Abstract
Mixing tetrasodium [meso-tetrakis(4-sulfonatophenyl)porphinato]zinc (Zn-TSPP) and meso-tetrakis(4-(trimethylammonio)phenyl)porphine tetratosylate (TTMAPP) in dimethylsulfoxide leads to formation of a star-like (stellate) microcrystal.
Stabilization of Superionic α-AgI at Room Temperature by Heating of AgI−Ag2O−MoO3 Glasses
Authors: Tatsumisago Masahiro , Saito Taira , Minami Tsutomu 
Published: March 2003

Abstract
We successfully prepared the superionic composites in which only the high-temperature phase of α-AgI was stabilized at room temperature in a superionic glassy matrix by a simple procedure with heating and consecutive cooling of AgI−Ag2O−MoO3 glasses. In the composites, α-AgI microcrystals were dispersed in the glassy matrix.
Fluorescence Sensing Behavior of Crystals of an Imidazole-Type Clathrate Host upon Contact with Gaseous Carboxylic Acids
Authors: Yoshida Katsuhira , Uwada Kazuki , Kumaoka Hironori , Bu Lequan , Watanabe Shigeru 
Published: March 2003

Abstract
The crystals of the title fluorescent clathrand exhibit a drastic fluorescence enhancement behavior upon contact with carboxylic acid vapors. The magnitude of the fluorescence change is greatly dependent on the enclathrated carboxylic acid molecules and increase in the following order: formic acid &lt; acetic acid &lt; propionic acid. To elucidate the enclathrated guest effects on the fluorescence properties of the crystals, the X-ray crystal structures have been determined.
Control of C–C and C–N Bond Cleavage of 2H-Azirine by Means of the Excitation Wavelength: Studies in Matrices and in Solutions
Authors: Inui Hiroshi , Murata Shigeru 
Published: March 2003

Abstract
The remarkable wavelengh-dependent photoreactions of 3-methyl-2-(1-naphthyl)-2H-azirine (1) were observed in matrices at 10 K and in solutions at room temperature. Irradiation of 1 with the long-wavelength light (366 nm) exclusively gave the products formed by the cleavage of the C–N bond of the 2H-azirine ring, while the products derived from the C–C bond cleavage were predominantly obtained in the irradiation with the short-wavelength irradiation (&gt;300 nm).