bluuebunny/crossref_metadata_2025_split huggingface dataset:
Radicals in the Mechanochemical Dechlorination of Hazardous Organochlorine Compounds Using CaO Nanoparticles
Authors: Ikoma Tadaaki , Zhang Qiwu , Saito Fumio , Akiyama Kimio , Tero-Kubota Shozo , Kato Tatsuhisa 
Published: December 2002

Abstract
For the first time, we detected paramagnetic products generated during the grinding of 3-chlorobiphenyl (BP-Cl) with calcium oxide (CaO) nanoparticles by a ball mill method, which is one of the promising ways to detoxify hazardous chlorinated organic compounds. Those products were assigned to oxygen-centered aromatic radicals coming from BP-Cl and trapped electrons in oxygen vacancies on the surfaces of the CaO reactants using high-frequency and pulsed electron paramagnetic resonance spectroscopies. The observed good correlation between the dechlorination efficiency and the radical yield suggests that a radical mechanism plays an important role in the destruction of organochlorine compounds. The mechanochemical dechlorination could be interpreted by the following mechanism. First of all, the mechanical stressing induces the electron transfer from O2− sites on the surface of the CaO particle to the organic compounds. The produced organic anion radicals then undergo the effective self-dissociation of a chlorine–carbon bond.
The ESR Spectra, Electronic Structure, and Thermal Reactivity of Fluoroethane Cations
Authors: Komaguchi Kenji , Sakurai Hiroshi , Shiotani Masaru , Hasegawa Akinori 
Published: December 2002

Abstract
The ESR spectra for the cation radicals of CH3CH2F (FE) and its partially deuterated derivatives, formed by irradiation with γ-rays in SF6 matrices at 77 K, were observed at low temperatures. The spectra consist of two lines typical of an anisotropic hyperfine coupling to a 19F nucleus. The optimized geometry of FE•+ was obtained by the ab initio MO method, and hyperfine splittings were evaluated by density functional theory (DFT). Two structures, A and B, were obtained having 2A′ and 2A′′ electronic states, respectively. Structure A is in a lower energy state by 0.31 eV than structure B, and is assigned to the detected cation radical. This structure has a SOMO composed of the 2p orbitals of two C and an F atoms in the molecular plane, and has an elongated C–C bond of 0.1884 nm. This resembles the SOMO given for C2H6•+. Furthermore, the structural distortion of FE•+ in zeolite and the thermal dissociation of FE•+ in matrices are reported.
Magnetic Field Effect on the Fluorescence of m-Phenylenebis(phenylmethylene) in a Rigid Glass at 77 K
Authors: Tanimoto Yoshifumi , Akimoto Yukimi , Fujiwara Yoshihisa , Mukai Masahiro , Takui Takeji , Kinoshita Takamasa , Itoh Koichi 
Published: December 2002

Abstract
The magnetic field effect (≤ 0.59 T) on the quintet–quintet fluorescence of m-phenylenebis(phenylmethylene) (MPBP) was studied in a rigid glass, decaline–cyclohexane (3 : 1) mixture, at 77K. The fluorescence decay rate of MPBP increases in a magnetic field. The effect on the MPBP fluorescence is explained in terms of the Zeeman mixing of excited quintet sublevels of MPBP.
The Incomplete Cubane Complexes Having Co3O4 or Mo3S4 Core with the N–N–O Type Tridentates; l-histidinato and Ethylenediamine-N-acetato
Authors: Ama Tomoharu , Rashid Md Monzur , Sarker Ashok Kumar , Miyakawa Hideyuki , Yonemura Toshiaki , Kawaguchi Hiroshi , Yasui Takaji 
Published: December 2002

Abstract
A trinuclear cobalt(III) complex, [Co3(l-his)3(μ-OH)3(μ3-O)]ClO4·H2O (l-Hhis: l-histidine), containing an incomplete cubane Co3O4 core was isolated and the structure was compared with [Co3(edma)3(μ-OH)3(μ3-O)]+ (Hedma: NH2CH2CH2NHCH2COOH) isomers. Using the edma and l-his as N–N–O type ligands, [Mo3(L)3(μ-S)3(μ3-S)]+ complexes with a Mo3S4 incomplete cubane core were also prepared, and their structures were determined by the X-ray diffraction method. A structural similarity between [Mo3(L)3(μ-S)3(μ3-S)]+ and [Co3(L)3(μ-OH)3(μ3-O)]+ is discussed; it is suggested that three N–H···O inter-ligand (intra-molecular) attractive interaction has an important role in stabilizing the incomplete cubane structure.
Synthesis, Structure, and Magnetic Property of a Dinuclear Vanadium(III) Complexes with N-Hydroxyethyliminodiacetate
Authors: Kanamori Kan , Ishida Kyoko , Fujimoto Kazuya , Kuwai Tomohiko , Okamoto Ken-ichi 
Published: December 2002

Abstract
A vanadium(III) complex with N-hydroxyethyliminodiacetate (heida(3-)) was prepared. The X-ray crystallography has revealed that the compound is a dinuclear vanadium(III) complex, which contains a di-μ-alkoxo bridge derived from the deprotonation of the hydroxyethyl group of the parent heida(2-) ligand. Each vanadium(III) center adopts a distorted octahedral structure. The temperature-dependent magnetic susceptibility measurement suggests that the electronic spin moments of the two vanadium(III) centers are antiferromagnetically coupled (g = 1.98 and J = −36.9 cm−1).
Novel Regioselective Synthesis of 6-(3-Hydroxy-1-propenyl)-2-phenyl-2,3-dihydrobenzo[b]-1,4-dioxin-3-methanol
Authors: Ganesh Thota , Sharma Kamalesh Kedarnath , Krupadanam Gazula Levi David 
Published: December 2002

Abstract
A novel regioselective synthesis of neolignan, 6-(3-hydroxy-1-propenyl)-2-phenyl-2,3-dihydrobenzo[b]-1,4-dioxin-3-methanol, is described. 2-[bromo(phenyl)methyl]-oxirane upon condensation with 3,4-dihydroxybenzaldehyde gave regioselectively (±)-trans-3-hydroxymethyl-2-phenyl-2,3-dihydrobenzo[b]-1,4-dioxin-6-carbaldehyde, which upon reaction with dihydropyran in dichloromethane using (PPTS) gave 2-phenyl-3-(tetrahydro-2-pyranyloxy-methyl)-2,3-dihydrobenzo[b]-1,4-dioxin-6-carbaldehyde. This compound by a Wittig reaction with ethoxycarbonylmethylenetriphenylphosphorane gave stereoselectively ethyl 3-[trans-2-phenyl-3-(tetrahydro-2-pyranyloxymethyl)-2,3-dihydrobenzo[b]-1,4-dioxin-6-yl]-2-propenoate, which upon reduction with DIBAL-H afforded the title compound.
Synthesis and Crystal Structures of Silapericyclynes
Authors: Unno Masafumi , Saito Takashi , Matsumoto Hideyuki 
Published: December 2002

Abstract
Five new silapericyclynes, (i-Pr2SiC≡C)n (n = 6, 8, 10) and (i-Pr2SiC≡CMe2SiC≡C)n (n = 3, 4) were prepared, and their structures were determined by X-ray crystallography. For sila[6]pericyclynes, the ring structures depend upon the steric demand of the substituents on silicon atoms; (i-Pr2SiC≡C)6 crystallized in nearly planar structure, and (i-Pr2SiC≡CMe2SiC≡C)3 formed a chair structure with small dihedral angles (109.6° and 121.7°), while (Ph2SiC≡C)6 crystallized in boat and chair forms. The crystal structures of larger pericyclynes (i-Pr2SiC≡C)8, (i-Pr2SiC≡C)10, and (i-Pr2SiC≡CMe2SiC≡C)4 showed that the substituents, isopropyl groups, were included inside the rings. These compounds show absorption maxima in the range of 203–221 nm.
One-Pot Preparations of (Dichloroiodo)arenes from Some Arenes
Authors: Lulinski Piotr , Obeid Nicolas , Skulski Lech 
Published: December 2002

Abstract
Arenes (ArH) were substituted with some transient I3+ species, generated in situ in appropriate, anhydrous I2/NaIO4 or NaIO3/AcOH/Ac2O/concd H2SO4 mixtures, to form soluble organoiodine(III) intermediates, ArISO4. Next, excess concd hydrochloric acid was added to precipitate out the title ArICl2, and isolated in 46–88% optimized crude yields.
Artificial Neural Network for Predicting the Toxicity of Organic Molecules
Authors: Admans Gary , Takahashi Yoshimasa , Ban Satoshi , Kato Hiroaki , Abe Hidetsugu , Hanai Sosuke 
Published: December 2002

Abstract
Structure–activity relationships for aquatic toxicity were studied using neural networks and linear regression analysis. The structural features contributing to toxicity were identified in molecules exhibiting a level of toxicity greater than that of non-reactive organic molecules. A neural network was trained for the toxicity of non-polar narcotics, polar narcotics, or reactive toxicants. Quantitative structure–activity relationships (QSARs) were developed, relating a molecular aquatic toxicity to its log P and to a set of 16 structural descriptors based upon the presence of selected structural features. The inclusion of these structural descriptors into a QSAR was found to enhance the correlation of the equation, and thus to improve its ability for predicting aquatic toxicity.
Mixed Metal Compounds Bridged by 1,4-Diphenylbuta-1,3-diyne Derived by C–C bond Coupling of Alkynyl Ligands
Authors: Yamazaki Shinsaku , Taira Zenei , Yonemura Toshiaki , Deeming Anthony J , Nakao Akiko 
Published: December 2002

Abstract
New mixed-metal compounds, PtRu3(μ4-η1:η1:η2:η4-PhCCCCPh)(CO)10(dppe) with isomers 1 and 2, have been prepared by reacting cis-dialkynyl platinum(II) complex, Pt(C≡CPh)2(dppe), with Ru3(CO)12, via a C–C bond coupling of the alkynyl ligands.
Synthesis and Characterization of Europium Complex Nanowire
Authors: Li Xiaofeng , Liu Weisheng , Wang Wenhua , Guo Xinyong 
Published: December 2002

Abstract
A new compound of benzyl 2-{2-[ethyl(phenyl)amino]-2-oxoethoxy}-1,1-bis{2-[ethyl(phenyl)amino]-2-oxoethoxymethyl}ethylcarbamate (L) was synthesized. The Eu(III) complex nanowires were fabricated by a template method and characterized by elemental analysis, IR spectrum and TEM. The longer luminescence lifetime was found for the Eu(III) complex nanowire in comparison with that of Eu(III) complex powder which is prepared by deposition reaction in solvent.
Fabrication of Self-assembled Polymer Particle Monolayers on Gold Substrates
Authors: Taniguchi Tatsuo , Shinohara Suguru , Kawaguchi Seigou , Nagai Katsutoshi 
Published: December 2002

Abstract
Polymer particles bearing sulfonium groups are found to be self-assembled on a gold substrate by simply immersion into latex. Millimeter-sized large domain of 2-D highly ordered particle arrays were also obtained in a self-assembled particle monolayer. Polymer particles were selectively assembled on a patterned gold substrate at the particle size level by a combination with photolithographic technique.
A Catalytic and α-Selective Sialylation Using Novel 5-Azido Sialyl Fluoride
Authors: Mukaiyama Teruaki , Mandai Hiroki , Jona Hideki 
Published: December 2002

Abstract
Catalytic and α-selective sialylation of several glycosyl acceptors with 5-azido sialyl fluoride 2 was successfully carried out in n-valeronitrile using a combined catalyst system of stannic chloride (SnCl4) and silver perchlorate (AgClO4) (1:2) in the coexistence of MS 5A and the corresponding sialosides were obtained in excellent yields with high α-selectivities.
High Magnetic Field Effect on the Growth of 3-Dimensional Silver Dendrites
Authors: Katsuki Akio , Uechi Ichiro , Fujiwara Masao , Tanimoto Yoshifumi 
Published: December 2002

Abstract
A liquid/solid redox reaction between silver ion and copper metal was investigated under high magnetic field (maximum field strength: 15 T). 3-Dimensional silver dendrites produced via the reaction were affected drastically by the magnetic field. Dense and large quantity dendrites were obtained under the magnetic field. Magnetic force will determine the shape and quantity of the silver dendrites.
Selective Permeation of Nitric Oxide through Two Dimensional Cross-linked Polysiloxane LB Films
Authors: Kato Dai , Sakata Masayo , Hirayama Chuichi , Hirata Yoshiki , Mizutani Fumio , Kunitake Masashi 
Published: December 2002

Abstract
Novel two-dimensional (2D) cross-linked polysiloxane LB films were prepared and applied to nitric oxide (NO)-permselective films in order to block other electroactive interfering substances, such as l-ascorbic acid, l-cysteine, and acetaminophen. The 2D cross-linked siloxane LB films deposited on Pt electrodes were remarkably effective in the elimination of the interfering responses and a rapid response to NO remained with modified LB films consisting of monolayers or even several layers.
Reactivity Control of a Dinuclear Xenophilic Species, Tp#Ni–RuCp(CO)2, via Spin Crossover across a Metal-metal Bond [Tp#: Hydrotris(4-bromo-3,5-dimethylpyrazolyl)borato]
Authors: Uehara Kazuhiro , Hikichi Shiro , Akita Munetaka 
Published: December 2002

Abstract
A high-spin, triplet xenophilic complex, Tp#Ni-RuCp(CO)2, readily reacted with 2e-donors (L) via spin crossover at Ni associated with transposition of the resultant coordinatively unsaturated site from Ni to Ru to give diamagnetic adducts, Tp#Ni-RuCp(μ-CO)2(L).
Time-resolved Measurement in Laser Ablation Voltammetry
Authors: Hinoue Teruo , Umemoto Kisaburo 
Published: December 2002

Abstract
A time-resolved measurement in laser ablation voltammetry (TR-LAV) was demonstrated with aqueous solution of hexacyanoiron (III) (ferrocyanide) and acetonitrile (AN) solution of dicyclopentadienyliron (II) (ferrocene, Fc) in a time region between 0.05 and 1350 ms. TR-LA voltammograms of ferrocyanide exhibited a sigmoidal oxidation wave at delay time longer than 0.15 ms, whereas the voltammograms of Fc in AN were deteriorated in shape by the iR drop effect at short delay time.
A New Determination Method of Nitric Oxide (NO) with a NO-selective Electrode Demonstrated by the Kinetic Analysis of NO Generation and Decomposition
Authors: Nakashima Yoshitaka , Yasui Hiroyuki , Sakurai Hiromu 
Published: December 2002

Abstract
A new determination method of nitric oxide (NO) was proposed by a NO-selective electrode on the basis of the kinetic analysis for the time-dependent amperometric currents due to NO generation and decomposition. From the linear relationship between the observed currents and the estimated NO concentrations in NONOate (NOC7) at physiological pH, the method was concluded to be useful for quantification of NO.
Density Functional Studies on the Solvation Free Energy of the Proton in Methanol
Authors: Hwang Sungu , Chung Doo Soo 
Published: December 2002

Abstract
The proton solvation free energy in methanol was calculated by B3LYP flavor of density functional calculations with the Poisson-Boltzmann solvation model. Solvents were taken into account in a hybrid manner, i.e., one to five molecules of methanol were explicitly considered while other solvent molecules were represented with an implicit solvation model.
Synthesis and Fluorescence of Pyridine-N-alkyl carbazole Copolymer Prepared by Oxidative-coupling Reaction
Authors: Zheng Jinyun , Zhan Caimao , Qin Jingui , Zhan Rui 
Published: December 2002

Abstract
A new kind of copolymers incorporated pyridine and N-alkyl carbazole alternatively into main chain has been prepared by oxidative-coupling copolymerization. The polymers are thermostable, highly soluble, and processable. The fluorescence spectra of the polymers display blue light emitting properties.
Absorption Spectra of Colored Isomer of Diarylethene in Single Crystals
Authors: Kobatake Seiya , Morimoto Masakazu , Asano Yukako , Murakami Akinori , Nakamura Shinichiro , Irie Masahiro 
Published: December 2002

Abstract
The colored isomer produced in 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene crystal upon irradiation with ultraviolet light showed an absorption maximum at 535 nm, which is 30 nm longer than that in hexane, 505 nm. The spectral shift is ascribed to the strained structure of the photogenerated closed-ring isomer in the crystal.
Effects of para-Phenyl Group on the Reactivities of Sterically Congested Triplet Diphenylcarbene
Authors: Hirai Katsuyuki , Iikubo Takashi , Tomioka Hideo 
Published: December 2002

Abstract
Bis(2,6-dibromo-4-phenylphenyl)carbene dimerizes to give tetrakis(2,6-dibromo-4-phenylphenyl)ethene, which is further photolyzed to afford 1,8-dibromo-9,10-bis(2,6-dibromo-4-phenylphenyl)-3,6-diphenylphenanthrene.
A Novel Three-component Pseudo-polymorphism in the Cholamide Inclusion Crystals Promoted by the Combination of Organic Guest and Water
Authors: Yoswathananont Nungruethai , Kita Hisakazu , Tohnai Norimitsu , Sada Kazuki , Miyata Mikiji 
Published: December 2002

Abstract
Cholamide (1) exhibits a novel pseudopolymorphism in a three-component system composed of 1, acetonitrile, and water. Recrystallization of 1 from a guest solution composed of an equal amount of acetonitrile and water gave one polymorph (triangular, 1:1:1 molar ratio of 1:acetonitrile:water). Diminished water in the guest solution provided the other polymorph (bilayer, 1:1:2).
Polysaccharide-polynucleotide Interaction (XI); Novel Separation System of RNAs by Using Schizophyllan-appended Column
Authors: Kimura Taro , Koumoto Kazuya , Mizu Masami , Sakurai Kazuo , Shinkai Seiji 
Published: December 2002

Abstract
Schizophyllan belongs to the β-1,3-glucan family and can form a complex with particular polynucleotides.1 We applied this complexation to specifically separate polynucleotides by constructing a schizophyllan-appended column. The column trapped poly(C) and poly(A), while it did not show any affinity to poly(G), which is consistent with the experimental results obtained in the homogenous solution. The present results indicate that the s-SPG column can be a new separation device for biomolecules.
Sonochemical Synthesis of Antimony Trisulfide Nanowhiskers
Authors: Wang Hui , Zhu Jun-Jie , Chen Hong-Yuan 
Published: December 2002

Abstract
Antimony trisulfide (Sb2S3) nanowhiskers with diameters of 20–30 nm and lengths over 400 nm have been successfully prepared by a convenient sonochemical method under ambient air.
Scattering Linear Polarizer Based on a Polymer Blend of Photo-cross-linkable Polymer Liquid Crystal and Photoinactive Polymer
Authors: Kawatsuki Nobuhiro , Hasegawa Takako , Ono Hiroshi , Yamamoto Tohei 
Published: December 2002

Abstract
A polymer blend film of a photo-cross-linkable liquid crystal (PPLC) and an isotropic copolymer shows polarization-selective scattering generated by the photoinduced optical anisotropy of the PPLC.
Application of solubility parameters to the formulation of acrylate methacrylate film coating systems
Authors: Eichie F. E. , Okor R. S. , Groning R. 
Published: December 2002

AbstractIn order to optimize the formulation of the acrylate methacrylate (AMA) coating systems, the partial solubility parameters of AMA and those of various coating solvents and plasticizers have been computed using the group contribution method of Van Krevelan and Hoftyzer. The data were analyzed in accordance with the three‐dimensional solubility parameters whereby δh (the hydrogen‐bonding component) was plotted against the sum of δd (the dipole–dipole component) and δp (the polar component). The data were also analyzed according to a two‐dimensional solubility parameters whereby δh was plotted vs δp to obtain the energy maps for the various compounds. With the three‐dimensional analysis, the position of the reference polymer in the energy map was centrally located and was flanked by plasticizers and solvents that were shown experimentally to be compatible with the polymer. On the other hand, the two‐dimensional analysis displaced the location of the reference polymer in the energy map leftward to the Y axis, and was not flanked by plasticizers and solvents that were compatible with it. The results show that the concept of the three‐dimensional solubility parameters was more applicable to the theoretical selection of plasticizers and solvents for the polymer studied. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1339–1344, 2003
Absorption of glycerol and its effects on the physical properties of a collagen material: Leather
Authors: Liu Cheng‐Kung 
Published: December 2002

AbstractAn aqueous solution of glycerol was applied to a polymeric biomaterial, leather, to evaluate its effects on the physical properties of leather, particularly stiffness. The initial strain energy, Young's modulus, and acoustic‐emission methods were used to characterize the stiffness of the resultant leather treated with these glycerol solutions. The measurements revealed that the glycerol treatment significantly reduced the stiffness of the dried leather, indicating the strong lubrication function of glycerol for leather. Experiments were also conducted to investigate the mechanism of glycerol adsorption into the leather matrix. Fick's second law of diffusion was employed to systematically derive a mathematical model for the absorption rate. The effect of temperature on the absorption rate was also included in the model by incorporation of the Arrhenius equation into Fick's second law of diffusion. The resultant model fits the experimental data very well. It not only depicts the mechanism of absorption but also predicts the absorption rate as a function of key variables. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1221–1231, 2003
Oxygen plasma modification of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) film surfaces for tissue engineering purposes
Authors: Hasirci V. , Tezcaner A. , Hasirci N. , Süzer Ş. 
Published: December 2002

AbstractPlasma glow‐discharge application is known as a technique to coat or modify the surfaces of various materials. In this study, the influence of oxygen rf‐plasma treatment on surface and bulk properties of a biological polyester, poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate), were studied by determining water content and water contact angle, and by using X‐ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The plasma‐treated films absorbed more water than the untreated film, and the absorbance increased with the total power applied. The water contact angles decreased and O/C atomic ratio increased on treatment, indicating that the material became more hydrophilic due to increases in the oxygen‐containing functional groups on the surface of the polymer. A direct relation could be observed when the O/C ratio was plotted against the total power applied (treatment duration × treatment power). SEM revealed a visual record of surface modification, the extent of which increased with increased total power. It was thus possible to alter the surface chemistry and relevant properties of the polymer film using oxygen plasma as a tool. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1285–1289, 2003