bluuebunny/crossref_metadata_2025_split huggingface dataset:
Transient Resonance Raman Spectroscopy and Density Functional Theory Investigation of Iso-Dibromoacetic Acid Photoproduct Produced From Ultraviolet Photolysis of Dibromoacetic Acid in the Solution Phase
Authors: Li Yun-Liang , Wang Dongqi , Phillips David Lee 
Published: September 2002

Abstract
We present transient resonance Raman spectra and density functional theory calculations that indicate the iso-dibromoacetic acid (Br–BrCHCOOH) species can be produced in noticeable amounts following ultraviolet photolysis of dibromoacetic acid in cyclohexane solution. We compare the properties of the iso-dibromoacetic acid species to those previously found for the related iso-dibromomethane species. We briefly discuss the potential utility of using iso-dibromoacetic acid in cyclopropanation reactions to make substituted cyclopropane products.
Femtosecond Time-Resolved Raman Signals on Ultrafast Dynamics in All-trans-β-Carotene
Authors: Yoshizawa Masayuki , Aoki Hirokazu , Hashimoto Hideki 
Published: September 2002

Abstract
Raman signals of excited states in all-trans-β-carotene have been investigated using recently developed femtosecond time-resolved Raman spectroscopy. The Raman signals are distinguished from other absorbance changes due to highly excited states using temporal and spectral dependence on the Raman pump pulse. The negatively stimulated Raman signals due to the 2Ag- excited state are explained by the Raman transition from the vibrational excited levels. The vibrational relaxation of the 2Ag- state has fast and slow kinetics. The fast one has a time constant of 0.6 ps, but the other is slower than the internal conversion to the ground state. Since the molecule exists in the vibrationally excited levels through the relaxation kinetics, the vibrational features in β-carotene are quite important with relation to energy transfer in photosynthesis.
Picosecond Infrared Spectra and Structure of Locally Excited and Charge Transfer Excited States of Isotope-Labeled 4-(Dimethylamino)benzonitriles
Authors: Okamoto Hiromi , Kinoshita Mariko , Kohtani Shigeru , Nakagaki Ryoichi , Zachariasse Klaas A 
Published: September 2002

Abstract
Infrared spectra of the ground, charge transfer (CT), and locally excited (LE) states of isotope-labeled 4-(dimethylamino)benzonitriles (DMABNs) in the region between 1700 and 900 cm-1 are reported. The isotopomers measured are normal DMABN, NC–C6H4–15NMe2 (dimethylamino nitrogen labeled DMABN), and NC–C6H2D2–NMe2 (3,5-dideuterated DMABN). The infrared spectrum of the excited CT state of DMABN-d2 is consistent with the previous band assignments for normal DMABN and DMABNs isotopically labeled on dimethylamino group. For the LE state of normal DMABN, three bands are observed at 1481, 1415, and 1399 cm-1. This is in contrast with a previously reported transient infrared spectrum, where positions of bands due to the transient do not shift from the ground state ones. The band at ca. 1481 cm-1 is observed for normal and 15N labeled DMABN, but not for DMABN-d2. Except for this point, the band positions are almost identical for the three isotope-labeled species. The vibrational transitions observed at ca. 1415 and 1398 cm-1 are hence attributed to modes with atomic displacements localized on methyl groups and/or the part of the benzonitrile moiety adjacent to the cyano group or the cyano group itself. Quantum chemical calculations of the vibrational spectra for the CT and LE states of DMABN at present do not correctly reproduce the experimental spectra, which means that more accurate calculations are needed for a reliable analysis of these spectra.
Mode Dependence of Vibrational Energy Redistribution in Nickel Tetraphenylporphyrin Probed by Picosecond Time-Resolved Resonance Raman Spectroscopy: Slow IVR to Phenyl Peripherals
Authors: Mizutani Yasuhisa , Kitagawa Teizo 
Published: September 2002

Abstract
The formation of the (d, d) excited state of (meso-tetraphenylporphyrinato)nickel(II) ([Ni(tpp)]) upon (π, π*) excitation, and its vibrational energy relaxation were monitored by picosecond time-resolved resonance Raman spectroscopy. Stokes resonance Raman bands due the (d, d) excited state instantaneously appeared upon the photoexcitation into the (π, π*) excited state. Their intensities decayed with a time constant of about 250 ps, which corresponds to electronic relaxation from the (d, d) excited state to the electronic ground state. This is consistent with the results of ultrafast absorption measurements reported by Eom et al. [H. S. Eom, S. C. Jeoung, D. Kim, J. H. Ha, and Y. R. Kim, J. Phys. Chem. A, 101, 3661 (1997)]. Anti-Stokes ν4 (macrocycle in-plane mode) intensities of [Ni(tpp)] in the (d, d) excited state appeared promptly and decayed with a time constant of 3.6 ± 0.6 ps. The rise and decay of anti-Stokes intensity are interpreted as vibrational excitation due to the excess energy and intermolecular vibrational energy transfer to the surrounding solvent molecules, respectively. The φ4 mode, which is mainly ν(CC) of the peripheral phenyl groups, gave no detectable anti-Stokes intensity although the mode gave appreciable Stokes intensity. This means that the φ4 mode is left vibrationally less excited than the ν4 mode in the process of vibrational energy relaxation and that intramolecular vibrational energy redistribution is not completed in a subpicosecond time regime. These results for [Ni(tpp)] demonstrate that the vibrational modes of peripheral groups are vibrationally less excited shortly after the formation of the (d, d) excited state and that energy redistribution in the peripheral groups takes place in picoseconds, such a short time is competitive with vibrational energy transfer to the surrounding solvent molecules.
Time-Dependent Vibration Stokes Shift during Solvation: Experiment and Theory
Authors: Asbury John B , Wang Yongqiang , Lian Tianquan 
Published: September 2002

Abstract
Peak shift dynamics of CO stretching modes of [Re(R2-bpy)(CO)3Cl] [R = COOH and COOEt] complexes in their MLCT excited state were studied in polar solvents using femtosecond visible pump and IR probe spectroscopy. For Re complex in dimethyl formamide, peak shift magnitudes for the three CO stretching modes are different but their dynamics are identical. Comparison in different alcohols showed that peak shift magnitude increases with solvent dielectric constant and peak shift time follows the trend of solvation time. The observed peak shift is attributed to solvation-induced time-dependent vibrational Stokes shift. A general theory based on the Onsager dielectric continuum model of solute solvent interaction and time-dependent reaction field was developed to qualitatively describe time-dependent vibrational Stokes shift. The theory predicts that the peak shift correlation function is determined by solvent dielectric relaxation at the vibration frequency, and the peak shift magnitudes are solvent and normal mode dependent. Although the observed trend of solvation-induced vibrational Stokes shift is consistent with the theoretical predictions, other contributions such as solute polarizability should also be included in more complete models. Solvation induced vibrational Stokes shift may be a general phenomenon in time-resolved vibrational spectroscopy of molecules undergoing significant change in charge or charge distribution.
Magnetic Resonance Analogies in Multidimensional Vibrational Spectroscopy
Authors: Scheurer Christoph , Mukamel Shaul 
Published: September 2002

Abstract
We survey the principles for the design of multidimensional vibrational spectroscopies that draw upon the analogy with liquid or solid state NMR and EPR spectroscopy. The much faster time-scales and the different energy regime in laser spectroscopy provide additional possibilities that lack magnetic spectroscopy counterparts. We also discuss the notion of through-bond vs through-space couplings between localized vibrations, which are of different nature than in NMR.
Heterodinuclear MIINiII (M = Co, Ni, Cu, Zn) Complexes of a Macrocyclic Compartmental Ligand. Anomalous EPR of CuIINiII Complex by Coordination of 1-Methylimidazole
Authors: Inoue Ko-ji , Ohba Masaaki , Okawa Hisashi 
Published: September 2002

Abstract
A phenol-based macrocyclic compartmental ligand, (L2;2)2-, having N(amine)2O2 and N(imine)2O2 metal binding sites sharing two phenolic oxygen atoms, has formed the following heterodinuclear MIINiII complexes: [CoNi(L2;2)(AcO)]PF6·CH3CN (1), [NiNi(L2;2)(AcO)]PF6 (2), [CuNi(L2;2)(AcO)]PF6 (3) and [ZnNi(L2;2)(AcO)]PF6·CH3CN (4). Furthermore, [CuNi(L2;2)(CH3CN)](PF6)2·CH3CN (3′) was obtained when 3 was recrystallized from acetonitrile. X-ray crystallographic studies for 1, 2, 3′ and 4 demonstrate that the MII resides in the N(amine)2O2 site and the NiII in the N(imine)2O2 site. The NiII in the N(imine)2O2 site has a planar geometry and is diamagnetic in all the complexes. The CoII of 1 and the NiII of 2 in the N(amine)2O2 site have a six-coordinate geometry together with a bidentate acetate group. The CuII in 3′ has a five-coordinate geometry together with one acetonitrile molecule, and the ZnII in 4 has a square-pyramidal geometry together with a unidentate acetate group. Complex 3′ in DMF combines 1-methylimidazole (MeIm) at the axial site of the NiII and the MeIm adduct in frozen DMF solution at 77.4 K shows EPR signals of g|| = 2.06 and g⊥ = 2.26 with a multi-line structure superimposed on the g|| component (A|| = 15.8 × 10-4 cm-1). The EPR signals are ascribed to the spin-doublet ground state (ST = 1/2) of antiferromagnetically coupled CuII(S = 1/2) - NiII(S = 1), and the multi-line structure is explained by considering hyperfine interaction with Cu nucleus (ACu = 50.0 × 10-4 cm-1) and superhyperfine interaction with N nucleus of MeIm (AN = 15.0 × 10-4 cm-1).
A Highly Selective Calix[4]arene-Based Chromoionophore for Ni2+
Authors: Ma Quanli , Ma Huimin , Wang Zhihua , Su Meihong , Xiao Hongzhan , Liang Shuchuan 
Published: September 2002

Abstract
A novel chromoionophore 5,17-bis(quinolyl-8-azo)-25,26,27,28-tetrahydroxycalix[4]arene has been synthesized as a highly selective reagent for Ni2+ in the presence of excess alkali, alkaline earth and other transition metal ions.
Useful Synthesis of the Main Dehydrohexapeptide Segment of a Macrocyclic Antibiotic, Berninamycin B
Authors: Yamada Takahiro , Okumura Kazuo , Yonezawa Yasuchika , Shin Chung-gi 
Published: September 2002

Abstract
The useful synthesis of tetradehydrohexapeptide segment 2, which is the main skeleton of a macrocyclic antibiotic, berninamycin B, was first achieved. The skeleton 2 is constructed, in turn, of 2-[(Z)-1-amino-1-propenyl]-5-methyl-oxazole-4-carboxylic acid, α-dehydroalanine (ΔAla), l-Val, 2-[1-amino-1-ethenyl]-5-methyloxazole-4-carboxylic acid residues, besides l-Thr and ΔAla at the N- and C-termini, respectively.
An 8-Aminoquinoline-Based Langmuir–Blodgett Film Sensor of Cu(II) Ion
Authors: Ouyang Jian-Ming , Xue Ping- , Ngan Hei-Ieng , Zheng Wen-Jie , Lu Zu-Hong , Hong Qing-Yue 
Published: September 2002

Abstract
A new amphiphilic bis-amide tetradenate ligand, N, N′-bis(8-quinolinyl)dodecylpropanediamide, H2A, was prepared and formed monolayer. The interactions between H2A monolayers and metal ions (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Mg2+, Cd2+, Hg2+, Pb2+, and La3+) were investigated. Only Cu2+ ion showed special coordination with H2A. It was proved by means of XPS. The selective copper binder of the Langmuir–Blodgett film of H2A may be developed as a sensor of copper ion.
Effect of Lanthanum Ions on the Photoelectrochemical Response of Bacteriorhodopsin
Authors: Saga Yoshitaka , Ishikawa Tomoko , Watanabe Tadashi 
Published: September 2002

Abstract
Lanthanum ions (La3+) drastically changed the pH dependence of the photocurrent responses from bacteriorhodopsin (bR). The pH value of the photocurrent polarity reversal was shifted to lower pH and the ratio of the light-off to the light-on photocurrent peak intensities, Ioff/Ion, was significantly decreased, compared with the photoresponse from the wild-type bR. These results are explained by invoking the effect of La3+ on the bR proton pump activity.
Spiropyran as a Regulator of DNA Hybridization with Reversed Switching Mode to That of Azobenzene
Authors: Asanuma Hiroyuki , Shirasuka Kenji , Yoshida Takayuki , Takarada Tohru , Liang Xingguo , Komiyama Makoto 
Published: September 2002

Abstract
The nitrospirobenzopyran, tethered at the 5′-end of the homothymidine, was thermally isomerized to colored merocyanine, which was converted reversibly to colorless spiropyran by visible light irradiation (λ &gt; 490 nm). Concurrently with the spiropyran→merocyanine isomerization, melting temperature of the duplex with its complementary oligonucleotide was changed from 18.0 °C to 21.6 °C.
Purification of Ammonia-Containing Water by Catalytic Selective Decomposition with Novel Pd-Supported Zirconia
Authors: Taguchi Junji , Yoshinaga Yusuke , Okuhara Toshio 
Published: September 2002

Abstract
Pd-Supported ZrO2 prepared through a hydrothermal treatment was found to be pronouncedly effective for purification of waste water containing ammonia; NH3 (1000 ppm) was exclusively converted to N2 at 433 K in the presence of O2 and undesirable NO2− and NO3− were not detected. It was further demonstrated that the Pd/ZrO2 was insoluble during the reaction and was reusable without any treatment.
Photoelectron Spectroscopy of Scandium-Arene Complex Anions
Authors: Judai Ken , Nakamura Yoshiaki , Tachibana Makoto , Negishi Yuichi , Nakajima Atsushi , Kaya Koji 
Published: September 2002

Abstract
Scandium-arene complex anions, Sc1(arene)m− (m = 1, 2; arene = benzene and toluene) were generated by the gas phase reaction of laser vaporized atoms with aromatic molecules. Sc1(toluene)2− was identified as a sandwich complex anion in the gas phase. The electronic structures of the complex anions were observed by photoelectron spectroscopy.
Conformational Effect of a Lateral Alkoxy Group on Mesomorphic Properties
Authors: Wu Jianwei , Okamoto Hiroaki , Takenaka Shunsuke 
Published: September 2002

Abstract
The mesomorphic properties of some homologs of 4-(4-alkoxyphenoxycarbonyl)phenyl 3-alkoxybenzoate (1), 3-alkoxy-4-methylbenzoate (2), and 3-alkoxy-2-methylbenzoate (3) were examined. Except the methoxy homolog, 1 are non-mesogenic, but 2 and 3 tend to exhibit a nematic phase. The nematic-isotropic transition temperature decreases in the order of 3 &gt; 2 &gt; 1. The unusual mesomorphic properties are discussed in terms of the conformational effect of the alkoxy group.
A Convenient Method for the Preparation of Unsymmetrical Bis-Aldols by Way of Sequential Two Aldol Reactions
Authors: Arai Hidehiro , Shiina Isamu , Mukaiyama Teruaki 
Published: September 2002

Abstract
Unsymmetrical alkyl 2-hydroxy-1-(1-hydroxyalkyl)alkyl ketones (bis-aldols) are successfully synthesized by way of sequential two aldol reactions using α-bromo ketones and two different aldehydes. In the first reaction, α-bromo-β-stannyloxy ketones are formed by tin(II) trifluoromethanesulfornate-promoted aldol reaction of α-bromo ketones with several aldehydes. Bis-aldols are then formed via the second aldol reaction between another aldehydes and dianionic enolates generated by the reduction of α-bromo-β-metalloxy ketones with titanium(IV) iodide and copper.
Preparation of Microporous Ga–Si–O Materials with Acidic Sites from a Gallium-Bridged Silsesquioxane
Authors: Wada Kenji , Yamada Koichi , Kondo Teruyuki , Mitsudo Take-aki 
Published: September 2002

Abstract
Ga–Si–O materials with acidic sites and uniformly-controlled micropores have been prepared by the calcination of a new gallium-bridged silsesquioxane [HNEt3]+[Ga{(Me3Si)(c-C5H9)7Si7O12}2]−.
Reaction of a Sulfur Bridged Incomplete Cubane-Type Tungsten Cluster with Acetylene: Formation of Three Carbon–Sulfur Bonds
Authors: Maeyama Masataka , Shibahara Takashi 
Published: September 2002

Abstract
The reaction of sulfur-bridged isothiocyanate tungsten cluster [W3(µ3-S)(µ-S)3(NCS)9]5− (5) with acetylene affords a novel complex having two acetylene molecules of different coordination modes, [W3(µ3-S)(µ3-SCH=CHS)(µ-SCH=CH2)(NCS)9]4− (6), and the presence of two kinds of intermediates [W3(µ3-S)(µ-S)(µ3-SCH=CHS)(NCS)9]5− (7) and [W3(µ3-S)(µ-S)2(µ-SCH=CH2)(NCS)9]4− (8) are suggested. They are characterized by X-ray crystallography (for 6) and 1H NMR spectroscopy (for 6, 7, and 8).
Characterization of Microporous Copper(II) Dicarboxylates (Fumarate, Terephthalate, and trans-1,4-Cyclohexanedicarboxylate) by Gas Adsorption
Authors: Seki Kenji , Takamizawa Satoshi , Mori Wasuke 
Published: September 2002

Abstract
Some microporous coordination polymers have been synthesized from copper salts and dicarboxylic acids. These stuctures were characterized by gas adsorption methods. The methane adsorption capacities of these coordination polymers were measured under high pressure. The measurement disclosed that these coordination polymers had uniform micropores and methane adsorption capacities almost the same as that of zeolite 5A.
Novel Insight into the Photochromism and Thermochromism of Hydrogen Bonded Schiff Bases
Authors: Suzuki Toshihide , Arai Tatsuo 
Published: September 2002

Abstract
The equilibrium between the enol form and the keto form in the triplet state of salicylideneanilines and salicylidenebenzylamines 1 in non-polar solvent has been explored based on the observation of phosphorescence and T–T absorption spectra.
Primary Processes in Photochromic Reaction of 4-Diethylamino-4′-dimethylamino-2-hydroxychalcone in Toluene
Authors: Tokumura Kunihiro , Taniguchi Naoto , Kimura Takashi , Matsushima Ryoka 
Published: September 2002

Abstract
A photochromic behavior was found for trans-4-diethylamino-4′-dimethylamino-2-hydroxychalcone in toluene, and colored species undergoing dark reaction to regenerate trans-isomer may be ascribed to cis-isomer with the lifetime of 77 min at room temperature. It is demonstrated that a trans→cis isomerization in the lowest triplet state is significantly responsible for the primary process of the coloration.
High Density Adsorption of Porphyrins onto Clay Layer without Aggregation: Characterization of Smectite-Cationic Porphyrin Complex
Authors: Takagi Shinsuke , Shimada Tetsuya , Yui Tatsuto , Inoue Haruo 
Published: September 2002

Abstract
Adsorption of the +4 charged cationic porphyrins onto an artificially synthesized smectite was studied. Porphyrin molecules adsorb on the clay sheet with high density to neutralize all the minus charges of the clay surface without aggregation by a novel method of a size-matching of distances between the charge sites. An efficient energy transfer between different porphyrins was induced on the clay surface, while there was no interaction in the ground state.
Chloride Ion Conducting Characteristics in Rare Earth Oxychlorides
Authors: Imanaka Nobuhito , Okamoto Koji , Adachi Gin-ya 
Published: September 2002

Abstract
Chloride ion (Cl−) conducting characteristics were investigated in calcium doped lanthanum oxychlorides which show a high stability even in a high humid atmosphere and at an elevated temperature. The Cl− ion conductivity of the oxychloride is approximately 10−4.5 S·cm−1 at 700 °C and the Cl− ion transference number is almost unity. The development of new types of Cl− ion conducting solid electrolytes with a high durability opens a door to realize a new application for functional materials.
Statistical Characterization of Nonbonded S···O Interactions in Proteins
Authors: Iwaoka Michio , Takemoto Shinya , Okada Mai , Tomoda Shuji 
Published: September 2002

Abstract
Weak nonbonded S···O interactions were characterized as stabilizing forces of protein structures based on the database analysis of selected heterogeneous structures in Protein Data Bank (PDB) as well as quantum chemical calculations at MP2/6-31G(d).
Conducting Langmuir–Blodgett Films of Bis[bis(methylthio)tetrathiafulvalenedithiolate]-gold Complex
Authors: Nakamura Takayoshi , Takahashi Toshiyuki , Yumoto Toru , Akutagawa Tomoyuki , Hasegawa Tatsuo 
Published: September 2002

Abstract
Single-component Langmuir–Blodgett films of a dithiolate complex [Au(tmdt)2] (tmdt2− = bis(methylthio)tetrathiafulvalenedithiolate) were prepared. The as-grown films were insulating, which became semiconducting with the activation energy of 0.05 eV after electrochemical doping.
The Fabrication of CuInSe2–Polyacrylamide Nanocomposites by a Convenient Simultaneous Polymerization–Decomposition Technique
Authors: Zhou Yong , Hao Lingyun , Hu Yuan , Zhu Yurui , Chen Zuyao 
Published: September 2002

Abstract
Either CuInSe2 nanoparticle or CuInSe2 nanorod was in situ dispersed in polyacrylamide (PAM) matrix by a convenient simultaneous polymerization–decomposition (SPD) technique.
Micronized Gel Electrophoresis: Construction and Its Versatile Applications
Authors: Biyani Manish , Nishizawa Hiroshi , Miyatani Yoshihide , Kanaumi Eiichi , Eli Pharhad , Kinoshita Yasunori , Nishigaki Koichi 
Published: September 2002

Abstract
We have constructed a one-inch-sized apparatus for gel electrophoresis (µGE). This apparatus was shown to be of high performance and to have potentials to apply to versatile purposes mainly due to its speed and economy. The temperature gradient gel electrophoresis as well as the conventional gel electrophoresis of multi-wells was successfully performed with both DNAs and proteins. Secondary gel electrophoreses in the two alternative modes, band-cut and zone-cut, were shown to be operable.
Equilibrium Analysis of Acid Dissociation Reactions of Phenolphthalein by Using Mobility Change in Capillary Zone Electrophoresis
Authors: Takayanagi Toshio , Motomizu Shoji 
Published: September 2002

Abstract
An equilibrium analysis method by capillary zone electrophoresis was utilized for the determination of acid dissociation constants of phenolphthalein, which is unstable in an alkaline aqueous solution. Apparent electrophoretic mobility of phenolphthalein increased with increasing pH of a migrating solution. Acid dissociation constants (pKa) of phenolphthalein were determined as 8.84 and 9.40 by applying a non-linear least-squares analysis to the mobility change.
Removal of NO by Microwave Discharge with the Addition of CH4
Authors: Tang Junwang , Zhang Tao , Wang Aiqin , Ren Lili , Yang Huanghe , Ma Lei , Lin Liwu 
Published: September 2002

Abstract
Removal of NO by a continuous microwave discharge at atmospheric pressure with the addition of CH4 is reported. The conversion of NO to N2 is approximately 80%, and the energy efficiency is up to 0.55 g-NO/kWh. The effects of CH4 addition and three discharge modes on NO conversion and energy efficiency are investigated. The dependence of NO conversion on experimental time is also observed.
Acoustic Cavitation in Water under Rare Gas Atmosphere
Authors: Nagata Yoshio , Okuno Hiroshi , Mizukoshi Yoshiteru , Maeda Yasuaki 
Published: September 2002

Abstract
The results of the sonolysis of water and aqueous 2-methyl-2-propanol under a rare gas atmosphere suggest that increasing the solubility of the rare gas in water significantly enhances the rate of sonolysis but their thermal conductivity does not significantly affect the temperature of the cavitation bubbles.
Metal-Modified Diamond Electrode as an Electrochemical Detector for Glucose
Authors: Uchikado Ryuji , Rao Tata N , Tryk Donald A , Fujishima Akira 
Published: September 2002

Abstract
Nickel- and copper-modified diamond electrodes were fabricated in view of their application for carbohydrate detection. Both electrodes produced well-defined and reproducible voltammograms for 1 mM glucose in alkaline media. These electrodes exhibited excellent electrochemical stability with low background current for at least one week in a flow injection analysis system, indicating good adherence of the metal clusters to diamond. These results indicate the promising use of nickel- and copper-modified diamond electrodes for the detection of carbohydrates and amino acids.
Synthesis of α-Carbolines from β-(3-Indolyl) Ketone O-2,4-Dinitrophenyloximes
Authors: Ono Ayako , Narasaka Koichi 
Published: September 2002

Abstract
α-Carbolines are synthesized from β-(3-indolyl) ketone O-2,4-dinitrophenyloximes by the treatment with sodium hydride and sodium cyanoborohydride.