bluuebunny/crossref_metadata_2025_split huggingface dataset:
Emission Spectra and Luminescence Life Times of Uranium–Mica Type Compounds
Authors: Sugitani Yoshinori , Kato Kenji , Nagashima Kozo 
Published: July 2006

Abstract
A series of uranium–mica type compounds M(UO2)2(XO4)2·nH2O, where M=Ca, Sr, Ba, Mg, Na2, K2, and (H3O)2; X=P and As, as well as the doped samples of Mg(UO2)2(PO4)2·nH2O : Mn(0.03 mol %) and Zn-(UO2)2(PO4)2·nH2O: Cu(0.1 mol %), have been prepared and measured for emission spectra under the UV(365 nm) excitation and decay times. Some of these samples, e.g., (H3O)2(UO2)2(AsO4)2·nH2O, have been found to give weak shoulders and a separated band, in addition to the six bands so far reported for other uranyl(VI) compounds. Samples containing AsO43− ions in place of PO43− gave emission spectra, where the main bands shifted by approximately 100 cm−1 to lower energy also giving shorter life times. The decay times of the six emission bands of Mg(UO2)2(PO4)2·nH2O have been found to have the same value of 2.5×10−4 s.
Chemistry of Organo Halogenic Molecules. XLVIII. Stereochemistry of Halofluorination of 1,2- and 1,4-Dihydronaphthalene
Authors: Stavber Stojan , Zupan Marko 
Published: July 2006

Abstract
Halofluorination of 1,2-dihydronaphthalene with a mixture of N-chlorosuccinimide or N-bromosuccinimide or N-iodosuccinimide–hydrogen fluoride–pyridine in ether proceeds with Markovnikov type regioselectivity. The reaction is stereospecifically anti, the anti adduct isomerizing to syn products under the reaction conditions. The elimination of hydrogen halide under basic conditions occurs only from the syn adduct, thus forming 1-fluoro-3,4-dihydronaphthalene. Halofluorinations of 1,4-dihydronaphthalene also occur stereospecifically anti, and elimination under basic conditions gives naphthalene.
Spirans. 16. 3,3′-Spirobi[3,4-dihydro-2H-[1,3]oxazino[3,2-a]benzimidazole] and Its Thia Analogue
Authors: Smoli\'{n}ski Stefan , Czarny Agnieszka 
Published: July 2006

Abstract
In order to obtain spiran the sodium derivative of o-phenylenediamine was subjected to reaction with 1,3-dibromo-2,2-bis(bromomethyl)propane in N,N-dimethylformamide. The compound was also synthesized by the reaction of the sodium derivative of 2,3-dihydro-1H-benzimidazol-2-one with 1,3-dibromo-2,2-bis(bromomethyl)propane. By this procedure the thia analogue of the spiran was obtained. In both cases the condensation route was unexpected. This is due to the fact that the solvent (DMF) takes part in the reaction and a stereo-electronic situation occurs, which is similar to that covered by Bredt’s exclusion rule.
Promoting Action of Inorganic Gases on the Rate of Dehydration of 2-Propanol over Ca-Y Zeolite
Authors: Ishinaga Yoshio , Otsuka Kiyoshi , Morikawa Akira 
Published: July 2006

Abstract
The dehydration of 2-propanol over Ca-Y zeolite has been enhanced in the presence of NO2, SO2, and Cl2 at 100 °C. This promoting action has been ascribed to the formation of acidic hydroxyl groups resulting from the reaction of the inorganic gases with zeolitic water or basic hydroxyl groups attached to the metal cations.
Solvent Isotope Effect of H2O and D2O on the Partition Coefficient of 1,3-Di-n-alkyl-1,3-propanedione
Authors: Watarai Hitoshi , Murakami Motoya , Suzuki Nobuo 
Published: July 2006

Abstract
The apparent partition coefficients of seven 1,3-di-n-alkyl-1,3-propanediones have been determined in dodecane/H2O and dodecane/D2O systems. From the results, the transfer free energies of β-diketones from H2O to D2O, ΔGH2O→D2O, have been calculated and are discussed in terms of the cavity formation energy.
Separation of Barium and Radium as Their TTA-complexes by Extraction Chromatography
Authors: Jin Kazuo , Kiba Toshiyasu 
Published: July 2006

Abstract
Satisfactory separation of a trace amount of radium from miligram amount of barium was attained on a column of 1.5 M TTA–MIBK (Daiflon) system. An HETP value as low as 0.47 mm was obtained with a column 0.98φ×30 cm at flow rate of 0.17 cm3 per minute. Distribution ratio of radium estimated from this column technique was compatible with the liquid-liquid extraction data.
Crystallographic Properties of Ca2Fe2O5. Difference in Crystallographic Properties of Brownmillerite-like Compounds, Ca2Fe2O5 and Sr2Fe2O5, at Elevated Temperatures
Authors: Shin Shigemitsu , Yonemura Michiko , Ikawa Hiroyuki 
Published: July 2006

Abstract
High-temperature X-ray diffraction analysis has revealed that Ca2Fe2O5 remains in the original brownmillerite-like form up to ca. 1100 °C, whereas Sr2Fe2O5 changes in crystal structure from brownmillerite to anion-deficient perovskite, without a change in oxygen content, above 700 °C.
Electrochemical Vicinal Addition of Two Alkyl Groups to Phenyl Substituted Olefins and Diethyl Fumarate
Authors: Satoh Sh\={o}hei , Taguchi T\={o}ru , Itoh Mitsuomi , Tokuda Masao 
Published: July 2006

Abstract
Electrochemical reactions of styrene, 1-phenyl-1-propene, 2-phenyl-1-propene, stilbene, and diethyl fumarate with alkyl halides in hexamethylphosphoric triamide containing lithium chloride produce the corresponding vicinal adducts of two alkyl groups of alkyl halides.
The Formation of the Oxidized Fe3O4–Fe2TiO4 Solid Solution by the Air Oxidation of the Aqueous Suspension
Authors: Katsura Takashi , Tamaura Yutaka , Chyo Gyong Sun 
Published: July 2006

Abstract
The oxidized Fe3O4–Fe2TiO4 solid solution with the spinel type structure was synthesized by means of ferrite methods at pH 9.0 and 65 °C. When the solid solution thus obtained was heated at 200 or 300 °C in air for 20 h, it was completely oxidized to form a ferromagnetic product, which retained the spinel type structure for Ti/Fetotal ratios from 0 to 0.5.
Intercalation Compounds FeOCl(Pyridine derivatives)1⁄n and FeOCl(n-Propylamine)1⁄4
Authors: Kikkawa Shinichi , Kanamaru Fumikazu , Koizumi Mitsue 
Published: July 2006

Abstract
Some pyridine derivatives were intercalated into the van der Waals gap of layered compound FeOCl. Pyridine, 2,6-dimethylpyridine, 4-aminopyridine, 2,4,6-trimethylpyridine, and n-propylamine were used as intercalates having different Lewis basicities. X-Ray diffraction, Mössbauer effect, electrical resistivity, ESR and electronic spectra were studied, some correlations being found between the measured parameters of these complexes and the basicities of organic intercalates. It is assumed that organic intercalates transfer their lone pair electrons on the nitrogen atom to FeOCl layers.
Electron Spin-Spin Interaction and Translational Diffusion of Nitroxide Radicals in Sodium Dodecyl Sulfate Micelles
Authors: Aizawa Masayuki , Komatsu Tsuyoshi , Nakagawa Tsurutaro 
Published: July 2006

Abstract
The line width measurements of ESR spectra of 2,2,6,6-tetramethyl-4-benzoyloxypiperidinyl-1-oxyl (BzONO) in sodium dodecyl sulfate (SDS) micelles have been carried out at various concentrations of BzONO. The plot of the line width against the concentration of BzONO shows a line with a break at mole fraction ca. 0.05, as opposed to the theoretical prediction that the plot would give a straight line. In order to explain this anomalous behavior, three models for the solubilization of BzONO are considered. On the basis of two of these models, spin exchange rates of BzONO in the micelles are estimated. Translational diffusion coefficients of BzONO in the SDS micelles at 20, 31, and 38.5 °C are calculated by using the spin exchange rate constants and an appropriate diffusion model. The obtained values are of the order of 10−7 cm2/s.
An UV-Visible Spectrophotometer Provided with a Photon Counting System for the Studies of Very Weak Absorption Spectra
Authors: Yamamoto Naoto , Sawada Takanori , Tsubomura Hiroshi 
Published: July 2006

Abstract
An ultrasensitive UV-visible spectrophotometer, of a single-beam type provided with a photon counting system having a time resolution of 10 ns has been constructed. It has been shown that absorption spectra can be measured to within an error of 10−5 in optical density with this instrument. Noise levels, measured as a function of the photon count numbers, are found to agree with the theoretically expected statistical fluctuation of the photons. Absorption spectra of thin naphthacene films, 32 nra or below in thicknesses, deposited on a quartz plate, were obtained with this instrument, and found to change with the film thickness.
Cyclopentenone Synthesis from 1,1-Dichloroallyllithium–Ketone Adducts as Well as from Dichlorocarbene–Allyl Alcohol Adducts
Authors: Hiyama Tamejiro , Shinoda Masaki , Tsukanaka Masao , Nozaki Hitosi 
Published: July 2006

Abstract
Treatment of (3,3-dialkyl-2,2-dichlorocyclopropyl)methanols with hydrobromic acid gives 2-cyclopentenones through postulated intermediates, 3-chlorocyclopentadienyl cations. Another method which should give the same cationic intermediates involves trifluoroacetic acid catalyzed reaction of 3,3-dichloro-1-alken-4-ols. This is found to be particularly useful for cyclopentenone annulation.
The Enantioface-differentiating (Asymmetric) Hydrogenation of the C=O Double Bond with Modified Raney Nickel. XXXIV. The Adsorption Mode of 2-Hydroxy Acid on Raney Nickel
Authors: Harada Tadao 
Published: July 2006

Abstract
The adsorbed species of the modifying reagent and the surface states of the catalyst caused by the modification of a Raney nickel with 2-hydroxy acid at various pH regions were investigated. The adsorption mode of 2-hydroxy acid was proposed in each modifying-pH region; that is, (1) in a pH region intrinsic to the solution of the free 2-hydroxy acid, nickel salt of 2-hydroxy acid was adsorbed on the catalyst surface corroded by the acid; (2) under weakly acidic conditions, nickel salt and sodium salt of 2-hydroxy acid were adsorbed on the catalyst surface partially corroded by the acid; (3) under neutral conditions, the sodium salt was adsorbed on the surface of the fresh Raney nickel, and (4) under strongly basic conditions, the sodium salt and NaOH were adsorbed on the surface of the fresh Raney nickel.
Liquid-phase Peptide Synthesis by Fragment Condensation on a Soluble Polymer Support. III. The Influence of the Content and the Chain Length of a Peptide Anchored to a Soluble Polymer Support on the Reactivity of the Amino-free Terminal of the Peptide
Authors: Narita Mitsuaki , Itsuno Shin-ichi , Hirata Masanori , Kusano Kazuya 
Published: July 2006

Abstract
In order to investigate the influence of the content and the chain length of a peptide anchored to a soluble polymer support on the reactivity of the amino-free terminal of the peptide, chloromethylated polystyrene, which is a starting material for peptide synthesis on a matrix, was prepared by the copolymerization of (chloromethyl)styrene with styrene. By the copolymerization, the chloromethyl content on the resin was easily controlled and obtained as reproducible. The repetitive peptide-chain elongations of a pentapeptide, –(Ala2–Leu3)–, and a decapeptide, –(Ala2–Leu3–Pro2–Leu3)–, were performed by the usual method, using soluble polymer supports with various contents of Ile–Ile, which was used as the internal reference to evaluate the coupling yields by means of amino-acid analyses of the resulting peptide resins. The solubility of the peptide resin, which depends on the content of the peptide and the solubility of the peptide fragment on the matrix, was found to be one of the important factors for an efficient coupling in liquid-phase fragment condensations on a soluble polymer support.
The Total Synthesis of Hydroxyisochamaecynone and Its Stereochemical Assignment
Authors: Ando Masayoshi , Asao Toyonobu , Takase Kahei 
Published: July 2006

Abstract
The structure of an acetylenic nor-sesquiterpene, hydroxyisochamaecynone, was determined to be 4α-hydroxy-5βH-13-noreudesm-1-en-11-yn-3-one (Ib) by means of the stereoselective total syntheses of two possible stereoisomers, Ib and 4β-hydroxy-5βH-13-noreudesm-1-en-11-yn-3-one.
Direct Conversion of Arylamines to the Halides by Deamination with Thionitrite or Related Compounds and Anhydrous Copper(II) Halides
Authors: Oae Shigeru , Shinhama K\={o}ichi , Kim Yong Hae 
Published: July 2006

Abstract
Reactions of various arylamines with either t-butyl thionitrite, t-butyl thionitrate, or p-toluenesulfonyl nitrite in the presence of anhydrous copper(II) halides under mild conditions gave corresponding aryl halides in good yields. This reaction in the presence of such olefins as acrylonitrile, styrene, and acrylic acid gave the corresponding 2-aryl-1-haloethanes as the main products. t-Butyl thionitrite, t-butyl thionitrate, and p-toluenesulfonyl nitrite were found to be better deaminative reagents than alkyl nitrites or alkyl nitrates due to their weak sulfur–nitrogen bonds.
Potentiometric Determination of the Concentration of Aggressive Anions That Can Be Tolerated by a Certain Passivator
Authors: Abd El Haleem Salah Mohamed , Abd El Aal Ali 
Published: July 2006

Abstract
The effect of various additives of Cl−, Br−, and I− on the potential of a passivated steel electrode was established. In solutions of Na2CrO4, Na2HPO4, and Na2WO4, S-shaped relations were obtained between the steady-state potential and the quantity of the aggressive salt added. The resulting active potentials were established after an induction period which decreases with increase in the concentration of the attacking ions and/or decrease in that of the inhibiting anions. The concentration, Cagg, that can be tolerated by a certain concentration of the inhibiting anion, Cinh, is given by logCinh=K+nlogCagg, where K and n are constants. The equation was derived theoretically on the basis of the changes produced in the structure of the double layer caused by specific adsorption of both aggressive and passivating ions. In solutions of KMnO4, NaNO2, and K3[(Fe(CN)6)], the passivating film could not withstand the corroding action of the halide ions.
Reactions of Imidoyl-palladium(II) Complexes with Electrophiles
Authors: Hiraki Katsuma , Fuchita Yoshio , Masumoto Toyohiko 
Published: July 2006

Abstract
Imidoyl-palladium(II) complexes, derived from the reactions between imidoyl chlorides and tetrakis(triphenylphosphine)palladium(0), react with perchloric acid or triethyloxonium tetrafluoroborate to give new aminocarbene-palladium(II) complexes.
Effect of Hydrogen Chloride on the Pyrolysis of Acetylene as Studied with a Single-pulse Shock Tube
Authors: Ogura Hiroo 
Published: July 2006

Abstract
The pyrolysis of acetylene in the presence of hydrogen chloride was investigated with a single-pulse shock tube in the temperature range 1100–1680 K. The hydrocarbons produced in the C2H2–HCl system were quite the same as those obtained in the C2H2–Ar system. The formation rate of the main pyrolysis product, 1-buten-3-yne, was reduced remarkably by the addition of hydrogen chloride, being of third-order and of inverse first-order with respect to the concentrations of acetylene and hydrogen chloride, respectively. The overall second-order rate constant obtained was
k(cm^3 mol^-1 s^-1)=2.9×10^12exp (-45800/RT).
As the chlorine atom containing product, only chloroacetylene was found in small amounts, its formation rate being of second-order with respect to acetylene. The inhibitory effect of hydrogen chloride on the 1-buten-3-yne formation rate was interpreted in terms of the change in the termination from the recombination reaction of 2-ethynylvinyl radical to the reaction of 2-ethynylvinyl radical with hydrogen chloride.
Field Theoretical Treatment of the Proton hfs in Aromatic Ion Radicals
Authors: Aono Shigeyuki , Nishikawa Kiyoshi , Deguchi Kisaburo 
Published: July 2006

Abstract
Field theoretical method to estimate the proton hfs in aromatic ion radicals is presented, and applied to explain why the proton hfs of the positive ion is larger than that of the negative ion of the same molecule. Since the Hartree-Fock orbitals of the neutral molecule are adequate for describing the negative ion state of this molecule, but not for the positive ion state, the correlation effect in the latter should be effectively taken into account, so that the particle propagators in the positive ion are renormalized. The hyperfine energy consists of two terms, the hyperfine self-energy term and the pole strength which is interpreted as the existence probability of the state under investigation. The electron correlation affects these differently between positive and negative ions.
The Preparation of Mesoporous Silica Gel and the Nature of the Modification of Its Surface with Organoalkoxysilane
Authors: Tanaka Kazuo , Shinoda Sumio , Takai Nobuharu , Takahashi Hiroshi , Saito Yasukazu 
Published: July 2006

Abstract
Mesoporous silica gel with a narrow pore-size distribution at the pore diameter of 200 Å has been prepared upon gelation in the presence of starch. Taking into account the effects on the geometrical properties of its surface, two typical surface-modifying procedures that utilize organoalkoxysilane were characterized. Procedure I retains the mesoporous structure, although the fixed amount of the organofunctional group is rather small. Procedure II introduces a large amount of the organofunctional group to the surface, but is accompanied by a pronounced reduction in both the B.E.T. surface area and the specific pore volume. The observed range of the apparent surface concentration of the organofunctional group and the scanning electron micrographs suggest that the surface is coated with highly crosslinked organosiloxane polymers in the latter case. Despite the contrasts between the two modified surfaces, the similarity of C-13 NMR line shapes, chemical shifts, and spin-lattice relaxation times between the respective surface organofunctional groups indicates that their microenvironment and mobility resemble each other.
Effect of a Polar Solvent on the 1JCH Spin-coupling Constants in Chlorine-substituted Ethanes
Authors: Watanabe Shosuke , Ando Isao 
Published: July 2006

Abstract
The directly-bonded 13C–H spin-coupling constants (1JCH) for two chlorine-substituted ethanes, CHCl2CHCl2 and CHCl2CH2Cl, have been measured in various solvents with a wide range of dielectric constants and/or as a function of the temperature. Also, these two effects were estimated by the finite perturbation theory based on the CNDO/2 approximation with the solvaton theory. Both experimentally and theoretically, the dielectric constant of a solvent affects the 1JCH more than the temperature. It is shown that the solvent effect on the 1JCH spin couplings in CHCl2CHCl2 and CHCl2CH2Cl arises mainly from electronic changes in the solute molecules caused by intermolecular solute-solvent interaction, more than from the change in the population of the rotational isomers.
Polymer-protected Colloidal Nickel Boride in Ethanol and Its Catalytic Activity for Hydrogenation
Authors: Nakao Yukimichi , Fujishige Shoei 
Published: July 2006

Abstract
Colloidal nickel borides were prepared in ethanol from nickel(II) chloride and sodium borohydride using a polymer as a protective colloid. For atmospheric hydrogenation of olefins such as acrylamide at 30 °C, the colloid prepared by using poly(vinylpyrrolidone) exhibited catalytic activity 15–60 times that of the usual nickel boride prepared without using a polymer. The high activity of colloidal nickel borides was found to be due to the polymers, soluble nylon being the most effective. The colloids are stable under oxygen-free hydrogen, decomposing immediately on exposure to air.
The Oxidation Reaction of Tl(I) to Tl(III) by the Peroxodisulfate Ion. I. Kinetics and Mechanism in an Aqueous Solution
Authors: Kimura Masaru , Akazome Tsuneko , Takenaka Kayo , Kobayashi Akiko 
Published: July 2006

Abstract
The oxidation reaction of the thallium(I) ion to the thallium(III) ion by the peroxodisulfate ion has been studied in an aqueous acidic solution. The reaction constituted a chain reaction initiated by the thermal decomposition of the peroxodisulfate ion, the reaction involving no direct reactions between the thallium(I) and peroxodisulfate ions. At thallium(I) ion concentrations larger than 0.004 mol dm−3, the reaction mechanism was assumed to be: S2O82−\oversetk1→2SO4\ewdot; S2O82−+H+\oversetk2→HSO4−+1/2O2+SO3; Tl(I)+SO4\ewdot\oversetk3→Tl(II)+SO42−; S2O82−+Tl(II)\oversetk4→Tl(III)+SO4\ewdot+SO42−; 2Tl(II)\oversetk5\undersetk−5\ightleftharpoonsTl(I)+Tl(III). The rate of the reaction was described as −d[S2O82−]/dt=(k1+k2[H+])[S2O82−]+k4(k1⁄k5)1⁄2[S2O82−]3⁄2. The rate constants at an ionic strength of 0.16 mol dm−3 were determined to be k1=1.99×1019exp[−157 kJ mol−1/RT]s−1, k2=2.75×1012exp[−103 kJ mol−1/RT] dm3 mol−1 s−1, and k4(k1⁄k5)1⁄2=2.81×1013exp[−108 kJ mol−1/RT] dm3⁄2 mol−1⁄2 s−1 in 0.01 mol dm−3 perchloric acid, the k4 value being increased with a decrease in the hydrogen-ion concentration. The ionic strength (μ) dependence was described as logk4(k1⁄k5)1⁄2=−4.17–1.05 μ1⁄2 in 0.01 mol dm−3 perchloric acid at 40 °C. The reaction rate was completely retarded by the addition of 1% acrlyronitrile, 5×10−6 mol dm−3 cerium(III) sulfate, 1×10−3 mol dm−3 cerium(IV) sulfate, or 0.1 mol dm−3 sodium acetate, and it was also remarkably retarded by the addition of 1×10−3 mol dm−3 tetranitromethane. The copper(II) ion and molecular oxygen did not appreciably affect the reaction rate, but the iron (III) ion accelerated it greatly.
Mössbauer Studies of the Gamma-ray-irradiation Effects of 1,10-Phenanthroline Compounds
Authors: Maeda Yonezo , Ohshio Hiroki , Takashima Yoshimasa 
Published: July 2006

Abstract
Mössbauer and infrared spectroscopies have been applied to the study of the gamma-ray-irradiation effects on eleven iron 1,10-phenanthroline compounds: [Fe(phen)2X2] (X=Cl−, HCOO−, NCO−, 1⁄2Ox2−, 1⁄2Mal2−, CN−, and NO2−), [Fe(phen)3]X2·nH2O (X=Cl−, ClO4−, HCOO−, and NO2−), [Fe(phns)2](ClO4)2·2H2O and [Fe(phnc)2](ClO4)2·H2O (phen=1,10-phenanthroline, phns=1,10-phenantroline-2-carbothioamide, and phnc=1,10-phenantroline-2-carboxamide). For all the low-spin complexes except [Fe(phen)3] (HCOO)2·6H2O, no chemical changes were observed on the Mossbauer spectra after irradiation. All the iron(II) complexes in the high-spin state except [Fe(phen)2Cl2] and [Fe(phnc)2] (ClO4)2·H2O were, however, changed to iron(III) species under the influence of irradiation. Three iron(II) complexes in the intermediate-spin state were sensitive to gamma-rays.
An X-Ray Photoelectron Spectroscopic Study of Several Ligands in Coordination Compounds
Authors: Yoshida Tooru 
Published: July 2006

Abstract
The N(1s) electron binding energies were measured by means of X-ray photoelectron spectroscopy for the complexes of 2-pyridinecarboxylic acid, 8-quinolinol, and anthranilic acid with a variety of bivalent metal ions. The correlations of their binding energies with the electronegativity and the ionic potential (Z⁄r) of the metal ion and the charge on the nitrogen atom, and the covalent character of the nitrogen–metal bond calculated on the basis of Pauling’s concept were examined. The chemical shift in the N(1 s) binding energy was about 1 eV at most. However, it was suggested that it is possible to use the chemical shift to determine the nature and strength of the nitrogen–metal bond in a series of complexes of the same ligand.
The Thermal Gas-phase Decomposition of Methyl Iodide
Authors: Saito Ko , Tahara Hiroyuki , Kondo Osamu , Yokubo Teiji , Thigashihara Tetsuo , Murakami Ichiro 
Published: July 2006

Abstract
The thermal gas-phase decomposition of methyl iodide diluted in Ar has been studied behind shock waves over the temperature range between 1050 and 1500 K and the total density range of 3.5×10−6–3.9×10−5 mol cm−3. The decomposition was monitored by means of the UV absorption of CH3I at 259 or 275 nm. The initiation reaction was found to be the C–I bond fission, and the process proceeded in the low-pressure region under the present experimental conditions. The low-pressure limit rate constant was obtained as:
k_2nd=10^15.40±0.26exp{-(42.56±1.50 kcal mol^-1)/RT}cm^3 mol^-1s^-1.
Applying the RRKM strong collision theory, the collision efficiency factor was estimated to be 0.018 at 1300 K.