bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Properties of Aqueous Solutions of Sodium 2-Sulfoethyl Alkanoates and Sodium Alkyl β-Sulfopropionates
Authors: Hikota Takeshi , Morohara Kiyoshi , Meguro Kenjiro 
Published: July 2006

Abstract
A series of sodium 2-sulfoethyl alkanoates RCOO(CH2)2SO3Na was prepared from sodium isethionate and fatty acids containing 9, 11, 13, and 15 carbon atoms. The Krafft point, the critical micelle concentration (CMC), the surface tension, the emulsifying power, the wetting time, the resistance to acid hydrolysis, and the calcium-ion stability of this series of surfactants were examined, and the results were compared with those of the corresponding sodium alkyl β-sulfopropionates ROCO(CH2)2SO3Na, which have another structure of ester-linkage. The CMC values of sodium 2-sulfoethyl alkanoates almost coincide with those value of the sodium alkyl β-sulfopropionates with the same number of carbon atoms. However, the Krafft point and surface tension at the CMC of sodium 2-sulfoethyl alkanoates were lower than those of the sodium alkyl β-sulfopropionates with the same number of carbon atoms. Sodium 2-sulfoethyl alkanoates are more stable than sodium alkyl β-sulfopropionates in their resistance to hydrolysis and to the calcium-ion.
Isotope Effect of Molten Thallous Nitrate in Countercurrent Electromigration
Authors: Okada Isao , Saito Nobufusa 
Published: July 2006

Abstract
The isotope effect of the thallous ion in the countercurrent electromigration of molten thallous nitrate has been measured at 219°C. The relative internal mobility difference between 203Tl+ and 205Tl+, ΔV⁄VTl, has been determined to be 0.00035±0.00002. The mass effect μTl=(ΔV⁄VTl)⁄(ΔM⁄MTl), has been calculated to be −0.035±0.002, and this value has been compared with those of alkali nitrates previously determined.
Chromium(III) Complexes with Iminodiacetic Acid or l-Aspartic Acid
Authors: Mizuochi Hisayuki , Shirakata Shuichi , Kyuno Eishin , Tsuchiya Ryokichi 
Published: July 2006

Abstract
The formation constants of chromium (III) complexes with iminodiacetic acid (IDA) and l-aspartic acid (Asp) as the terdentate ligands were determined by the pH method in the ionic strength, μ=0.1 and at 25°C: their values were logk1=10.9 and logk2=10.5 for IDA and logk1=10.1 and logk2=9.5 for Asp, respectively. That the overall formation constants of chromium(III)-IDA complexes obtained were slightly larger than those of the corresponding -Asp complexes was explained by the stronger chelate effect in the former complexes than in the latter ones. The solid chromium (III) complexes with IDA and Asp were also prepared. Based on chemical analyses and the conductivity measurement or the behavior toward the ion exchangers, the chemical formulas of these complexes are possibly K[Cr(ida)2]·3H2O and K[Cr(OH)2asp] respectively. X-Ray powder diffraction patterns indicated that the former crystalline complex has tetragonal unit lattice, the axial parameter being a=14.57 and c=12.38 Å, whereas the latter is amorphous solid.
The Phosphorescence Processes in Pyrimidine and 2-Chloropymidine
Authors: Nishi Nobuyuki , Shimada Ryoichi , Kanda Yoshiya 
Published: July 2006

Abstract
The phosphorescence spectra of pyrimidine and 2-chloropyrimidine have been observed at 4.2°K. A detailed vibrational analysis of the pyrimidine spectrum suggests that the emission arises from two components of the emitting triplet state. The phosphorescence lifetimes of pyrimidine and 2-chloropyrimidine have been measured for the 0-0 band and the strongest “vibronic band” (the phosphorescence maximum), which involves various modes of vibrations, at different temperatures between 77 and 1.5°K. The decay curve observed for the 0-0 band has been resolved into two exponential components, and that for the vibronic band, into three exponential components, where the third component was extremely weak in intensity at a very low temperature. From the comparison of the observed and calculated lifetimes of the individual phosphorescence components and their relative intensities, it was deduced that: (1) the 0-0 band involves emissions arising from the B2 and A1 components of the 3B1(n,π*) state, while the vibronic band involves an additional, third emission which very likely arises from the A2 component; (2) the 1A2(n,π*) state is located below the 1B1(n,π*) state; (3) the 3A1(π,π*) state is located below the 1A2(n,π*) state, and (4) the major intersystem crossing takes place from both the 1A2(n,π*) and 1B1(n,π*) states to the 3A1(π,π*) state in pyrimidine and 2-chloropyrimidine.
Stereochemistry of Trimethylenediaminetetraacetatocobaltate(III)
Authors: Ogino Hiroshi , Takahashi Masatake , Tanaka Nobuyuki 
Published: July 2006

Abstract
Conformation of trimethylenediaminetetraacetatocobaltate(III) (Cotrdta−) was inferred from the measurement of proton nuclear magnetic resonance spectra. It was found that K[Co-trdta]·2H2O crystals are mixtures consisting of equimolar amounts of the crystals of K[(+)546-Cotrdta]·2H2O and those of K[(−)546Cotrdta]·2H2O; that is, so-called “spontaneous resolution” was found. The absolute configuration of optically active Cotrdta was determined by the measurements of optical rotatory dispersion (ORD) and circular dichroism (CD) curves and by the reaction with ethylenediamine to form tris(ethylenediamine) cobalt(III) cation.
The Thermal Reaction of 3-Acetylguaiazulene with Sulfur
Authors: Kurokawa Shinji 
Published: July 2006

Abstract
When 3-acetylguaiazulene was heated with sulfur at 200°C, three new azulenoids were obtained, in addition to the S-guaiazulene formed by the loss of the acetyl group; the structures were established as 2-acetylguaiazulene, 6-acetyl-, and 7-acetyl-3,5,8-trimethylazuleno [6,5-b] thiophenes. From the experimental results it became obvious that a sulfur atom linked one methyl carbon atom of the isopropyl group with the C6-azulene-ring carbon atom in 3-acetylguaiazulene, resulting in the formation of a thiophene ring, and also that the loss and the migration of the acetyl group took place in 3-acetylguaiazulene as well. The acetyl migration in this compound was ascertained to be a simple thermal reaction and to occur in one direction, from C3 to C2.
Molecular Vibrations and Force Fields of Alkyl Sulfides. I. Dimethyl Sulfide and Its Deuterated Compounds
Authors: Shiro Yuji , Ohsaku Masaru , Hayashi Michiro , Murata Hiromu 
Published: July 2006

Abstract
Dimethyl sulfide and dimethyl sulfide-d1 were prepared, and their infrared spectra were measured in the gaseous and liquid states. The Raman spectra were measured in the liquid state. The assignments of their spectra were made. On these assigned frequencies, two sets of modified Urey-Bradley force constants and a set of local symmetry force constants were determined by a least-squares technique. The obtained force constants were then transferred to the treatment of the vibrational frequencies of dimethyl sulfide-d3. The centrifugal distortion constants obtained from the vibrational data were compared with those from the data of the microwave spectra in order to confirm the reasonableness of the obtained force constants.
Molecular Vibrations and Force Fields of Dimethyl Selenide and Dimethyl Selenide-d6
Authors: Shiro Yuji , Ohsaku Masaru , Hayashi Michiro , Murata Hiromu 
Published: July 2006

Abstract
A set of the modified Urey-Bradley force constants and of the local symmetry force constants of dimethyl selenide have been calculated by a least-squares technique, using the vibrational frequencies of the two isotopic species, (CH3)2Se and (CD3)2Se. The calculated frequencies thus obtained are in good agreement with the observed values. Comparison has been made for the force constants among dimethyl ether, dimethyl sulfide, and dimethyl selenide. This has shown the reasonable relation to be expected among the force constant, the bond length, the bond angle, and the atomic number of the central atom. The centrifugal distortion constants, which were calculated from the two sets of force constants, were then compared with those obtained from the microwave spectra; their values are found to be consistent with those obtained from a microwave study in a three-body approximation.
Optical and ESR Studies on Triphenylimidazolyl Radicals Produced by Photolysis and Radiolysis at Low Temperature
Authors: Shida Tadamasa , Maeda Koko , Hayashi Taro 
Published: July 2006

Abstract
The characteristic temperature-dependent behavior exhibited by the solution of the photochromic dimer of triphenylimidazolyl (photo-dimer) has been reinvestigated by means of optical and ESR spectroscopy. Assuming two conformations for triphenylimidazolyl radical, the spectral change at low temperatures has been elucidated in terms of a conformational isomerization of the radical and dimerization of the radical to a colorless dimer. Photo-dimer in γ-irradiated glassy solutions undergoes a dissociative electron attachment to produce triphenylimidazolyl radical and its anion.
The Crystal Structure and the Molecular Behaviour of 2,3-Dibromo-2,3-dimethylbutane at Room Temperature
Authors: Namba Yoshiyuki , Oda Tsutomu , Fukuda Nobuto , Takada Osamu 
Published: July 2006

Abstract
The crystal structure of 2,3-dibromo-2,3-dimethylbutane at room temperature has a disordered nature. In the crystal, trans-form molecules have at least four orientations of equal statistical weight around the axes parallel to the [001] direction. Therefore, in spite of the low symmetry of the molecule, the crystal belongs to the tetragonal system and has the space group of I4/mmm, while a=7.38 Å, c=8.12 Å and Z=2.
The Crystal Structure of cis-Dinitrotetraamminecobalt (III) Nitrate
Authors: Oonishi Isao , Fujimaki Hiroto , Muto Fumio , Komiyama Yoshimichi 
Published: July 2006

Abstract
The crystal structure of cis-dinitrotetraamminecobalt(III) nitrate, [Co(NO2)2(NH3)4]NO3, has been determined from three dimensional X-ray diffraction data. The dimensions of the orthorhombic unit cell are: a=12.19 Å, b=7.18 Å, c=10.92 Å, and Z=4. The space group is P212121. The structure has been refined by the three-dimensional Fourier and least-squares methods to R=0.095. The complex ion has a slightly distorted octahedral coordination, with six N atoms at 1.96±0.02 Å. The complexes are tightly bound together by N–H···O interactions, thus forming a three-dimensional network.
Substituent Effects on Spectral Properties of Protonated Azo Compounds
Authors: Eian G L , Kingsbury Charles A 
Published: July 2006

Abstract
The effect of a remote substituent upon the NMR and visible spectra, and upon hydrogen-deuterium exchange in certain phenylazophenol systems is reported. Electron donating substituents uniformly lower the NMR chemical shift function, Δδ, cause bathochromic shifts in the visible spectra, and increase the rate of deuterium exchange. Correlations between the above measurements and also with Hammett constants are reported. In particular the logarithm of t1⁄2 is linear with δO the chemical shift of the position adjacent to the position attacked by deuterium.
Hydrodynamic Voltammetry with the Convection Electrode. IV. The Measurements of the Kinetic Parameters of the Electrode Reaction. Part II
Authors: Suzuki Junsuke 
Published: July 2006

Abstract
The convection electrode system was applied to the determination of the kinetic parameters of the electrode reaction. By analyzing the observed current-voltage curve, the parameters of a and k° were calculated; for the ferric-ferrous system in 0.1m perchloric acid, α and k° were found to be 0.63 and 7.6×10−3 cm/sec respectively, while for the hexammine cobaltic-cobaltous system in 1m ammonia-ammonium chloride, they were 0.65 and 4.5×10−6 cm/sec respectively.
The Cation-exchange Separation of Nitrosylruthenium(III) from Ruthenium(III and IV) and Its Radiochemical Applications
Authors: Miki Eiichi , Ishimori Tatsujiro , Okuno Hisateru 
Published: July 2006

Abstract
The cation-exchange separation was made on a 0.1m perchloric acid solution of the evaporated residue of a hydrochloric acid solution which contained nitrosylruthenium(III) of 10 mg–100 μg Ru and ruthenium(III and IV) of 100–10 μg Ru; the nitrosylruthenium species were eluted by the use of 80–90 ml of 0.1m perchloric acid, and the ruthenium species, by the use of 100 ml of 3m hydrochloric acid containing 50 vol% ethyl alcohol for the columns (3–8 ml) of the HR type. It was found by means of the separation that a 106Ru-nitrosylruthenium tracer can be quantitatively prepared by passing nitric oxide into a hydrochloric acid solution of 106Ru-ruthenium(III and IV). The separation on dipotassium pentachloronitrosylruthenate(III) irradiated by thermal neutrons indicated that the specific activities caused by 103Ru in the ruthenium fractions are a few hundred times as high as those in the nitrosylruthenium fractions.
Synergistic Effect in Solvent Extraction—Effect of the Chelating Ligands on the Stability of Lutetium Mixed Chelates with β-Diketones and Their Adducts with TOPO—
Authors: Shigematsu Tsunenobu , Honjyo Takaharu 
Published: July 2006

Abstract
The effect of the chelating ligands on the stability of mixed chelates of lutetium with β-diketones and the stability of their adducts with TOPO in benzene was studied by extracting lutetium with mixtures of two β-diketones, benzoylacetone (BzA) and dibenzoylmethane (DBM), and benzoylacetone and benzoyltrifluoroacetone (BFA), in the absence or in the presence of TOPO. The results are summarized as follows. (1) The extraction constants of Lu-BzA-DBM mixed chelates are almost the same as statistically calculated, while those of Lu-BzA-BFA mixed chelates are somewhat lower than the theoretical values. (2) The stability of the TOPO adducts of the mixed chelates increases in the order, M(BzA)2(DBM)≈M(BzA)(DBM)2&lt;M(BzA)2(BFA)&lt;M(BzA)(BFA)2, which is almost the same as that found among the extraction constants of the mixed chelates. The fluoromethyl group stabilizes the adduct more than phenyl group. (3) All the mixed chelates of lutetium β-diketonates bind one molecule of TOPO per metal chelate.
The Thermal Annealing Behavior of Recoil Manganese Atoms Produced in Alkali Metal Permanganates by (n, 2n) and (n, γ) Reactions
Authors: Shiokawa Takanobu , Sasaki Teikichi 
Published: July 2006

Abstract
The thermal annealing behavior of recoil manganese atoms produced in alkali metal permanganates by 55Mn(n,2n)54Mn and 55Mn(n,γ)56Mn reactions was studied. In the case of potassium permanganate, the thermal annealing of 54Mn proceeded faster than that of 56Mn. The retention of 54Mn in the annealing curve decreased after an initial increase when it was treated at 180°C, whereas this anomaly was not observed in the case of 56Mn. These differences in the annealing behavior of the two nuclides were ascribed to the effects of background gamma radiation during the neutron irradiation and also to the differences in recoil energies. An effect of the counterpart cations of permanganate was also observed in the thermal annealing behavior, and was interpreted in terms of the ionization potential of alkali metal.
The Metal-Catalyzed Autoxidation of Cumene
Authors: Kamiya Yoshio 
Published: July 2006

Abstract
The catalysis of metal carboxylates and metal phthalocyanines in the autoxidation of cumene was kinetically studied. The limiting rate of oxidation of cumene was just over half the theoretical rate of kp2(RH)2/2kt suggesting that the induced decomposition of cumyl hydroperoxide due to cumyloxy radical proceeds rapidly. The effect of metal catalyst in the autoxidation of cumene was concluded to be caused by the decomposition of hydroperoxide and not by the activation of oxygen, since the rate of oxidation increased with the increase in the rate of metal-catalyzed decomposition of hydroperoxide. The synergistic effect on the metal-catalyzed autoxidation of cumene was proved to result from the synergistic effect of metal salts on the decomposition of hydroperoxide. The oxidation products of cumene varied remarkably according to reaction conditions.
Aromatic Substitution of Olefin. X. Formation of Biphenyl Derivatives by Means of Olefin-Palladium Chloride Complexes and Silver Nitrate
Authors: Fujiwara Yuzo , Moritani Ichiro , Ikegami Katsuhiko , Tanaka Ryohei , Teranishi Shiichiro 
Published: July 2006

Abstract
The system, olefin-palladium chloride complex-silver nitrate has been shown to cause the oxidative coupling reaction of the aromatic compounds to afford biphenyl derivatives. The mechanism was also discussed in connection with the aromatic substitution of olefins by palladium salts.
Syntheses of 2,3-Dihydro-4(1H)-pyridones
Authors: Sugiyama Noboru , Yamamoto Makoto , Kashima Choji 
Published: July 2006

Abstract
The condensation of β-diketones with benzaldazine yields 1-benzylidenimino-2,3-dihydro-4-pyridones, which may be catalytically hydrogenolyzed to the corresponding 2,3-dihydro-4(1H)-pyridones. Some reactions of 2,3-dihydro-4(1H)-pyridones are discussed.
Mechanism of Decomposition of Carboxylic Sulfurous Anhydrides
Authors: Kobayashi Michio , Minato Hiroshi , Ogi Yoshikuni 
Published: July 2006

Abstract
Ethyl benzoyloxysulfinate, prepared from 18O-labeled benzoic acid and ethyl chlorosulfite, was decomposed and the products were analyzed. The 18O analyses showed that; 1) prior to decomposition the 18O of the mixed anhydride was scrambled due to the formation and the internal return of an ion-pair, C6H5C+−OSOEt; 2) ethyl benzoate, benzoic anhydride and diethyl
(Remark: Graphics omitted.)
sulfite were produced via an ionic chain mechanism involving successive attack of ethoxide anion and benzoate anion on the carbonyl carbon and sulfinyl sulfur of the mixed anhydride.
Phosphorescence of Quinoxaline-Durene Mixed Crystal — Analysis of Fine Structures and Decay Characteristics
Authors: Nakano Yasuko , Azumi Tohru 
Published: July 2006

Abstract
The phosphorescence spectrum of quinoxaline doped in durene crystal is observed at 4.2°K. The spectrum is composed of a number of sharp bands, many of which being interpreted as arising from the coupling with the ground state molecular vibrations of quinoxaline. Associated with the 0,0 and vibronic bands three weak bands were observed which are separated from the vibronic band by 19, 30 and 52 cm−1. The nature of these three bands is not well understood, but it is certain that they are not due to the lattice vibrations of the durene host. The decay of the phosphorescence is investigated at fifteen different temperatures between 4.21 and 1.59°K. Above 2.41°K the decay is single exponential with a lifetime of 0.246 sec. Below 2.19°K, however, the decay is expressed as a sum of two exponential decays whose lifetimes are 0.757 and 0.093 sec. The shorter one is approximately one third of the lifetime at 4.21°K. The change of the decay characteristics at a temperature between 2.19 and 2.41°K is interpreted to be associated with the spin alignment. In terms of these data, together with the polarization ratio observed by Chaudhuri and El-Sayed, radiative and radiationless rate constants are estimated for each of the three magnetic subcomponents of the triplet state. The experimental results and their interpretation are partly in disagreement with the work by de Groot, Hesselmann and van der Waals, and the source of the discrepancy is analyzed.
The Dichroic Spectra of Hydroxy Derivatives of Naphthalene, Anthracene, and Phenanthrene in Polyvinylalcohol Sheets
Authors: Inoue Hiroyasu , Nakamura Takio , Igarashi Tetsutaro 
Published: July 2006

Abstract
The dichroic spectra of 1,4-dihydroxynaphthalene, 9-hydroxyanthracene, sodium 9,10-dihydroxyanthracene-2-sulfonate, and 9,10-dihydroxyphenanthrene, which were usually unstable in a liquid solution, were measured in stretched polyvinylalcohol sheets. From a comparison of the results of the dichroic spectra with those of the MO calculations, the polarizations of the electronic bands were determined, and the bands were assigned in terms of the relevant bands of the corresponding unsubstituted aromatic compounds.
The Liquid-phase γ-Radiolysis of Benzene-Nitrous Oxide Mixtures
Authors: Hirokami Shun-ichi , Shishido Seishi , Sato Shin 
Published: July 2006

Abstract
The γ-radiolysis of the benzene-nitrous oxide liquid mixtures has been studied at room temperature and at 0°C, the mixing ratios covering almost all the range from pure benzene to pure nitrous oxide. Phenol was found to be one of the main products; its G-value is about a half of that of nitrogen at the lower concentration of nitrous oxide. Kinetic analysis shows that the G-values of electrons from benzene are 3.2±0.2. An empirical equation for expressing the G-value of nitrogen from the benzene solution of nitrous oxide proposed by Hentz and Sherman (J. Phys. Chem., 73, 2676 (1969).) was examined. The agreement was very poor at higher concentrations of nitrous oxide. Possible reasons were discussed.
Studies on Triplet Energy Transfer by Means of an Emission-Absorption Flash Technique. II. Mixed Triplet-Triplet Annihilation in Ethanol
Authors: Kikuchi Koichi , Kokubun Hiroshi , Koizumi Masao 
Published: July 2006

Abstract
The mixed delayed fluorescence due to the processes, (Remark: Graphics omitted.) in the following systems in ethanol solutions have been quantitatively investigated, a) 1) 9-methylanthracene-anthracene, 2) 9-phenylanthracene-anthracene, 3) 9-methylanthracene-9-phenylanthracene, 4) anthracene-acridine, 5) 9-methylanthracene-acridine, 6) 9-phenylanthracene-acridine. b) 7) eosin-anthracene, 8) proflavine-anthracene, 9) eosin-acridine. It has been found that for class a) in which the separations of singlet excited levels of A and B are less than a few times of kT, the delayed fluorescence of both components occur and the value of (pMA+pMB is close to that of the efficiency of a simple p-type delayed fluorescence, pA or pB. The delayed mixed excimer fluorescence also occurs in most cases. For class b) in which the level differences largely exceed kT, only the delayed fluorescence of the lower level component occurs. It has also been established that the delayed excimer fluorescence in a single component system increases in intensity from anthracene through 9-methyl-to 9-phenylanthracene. The pMA/pMB values are discussed for systems (1), (2), and (3).
Synthesis and Spectral Properties of Chloro-substituted Triptycenes
Authors: Mori Ikuko , Kadosaka Tadao , Sakata Yoshiteru , Misumi Soichi 
Published: July 2006

Abstract
A series of 2-, 7-, 10-, and 11-chloro-substituted triptycenes were prepared by means of the addition of benzyne or 3-chlorobenzyne to anthracene and its derivatives for studying the effect of chloro-substituent on electronic and NMR spectra. It was found that the intensity of the longest wavelength bands in the chlorotriptycenes could be explained in terms of superposition of three benzenoid chromophores, and that the calculated value of chloro-group on magnetic anisotropy was in good agreement with the values reported.
Electronic Spectra of Biphenyl and Fluorene
Authors: Hoshi Toshihiko , Inoue Hiroyasu , Shiraishi Junko , Tanizaki Yoshie 
Published: July 2006

Abstract
The ultraviolet absorption spectrum of diprotonated-2,7-diaminofluorene has been divided into two components polarized along the long and the short axes of the molecule by using the results of the dichroic spectra in the stretched PVA sheet. By a comparison of the experimental results with those calculated by means of a semiempirical LCAO-ASMO-SCF-CI approximation including a variable β method the assignment of the absorption bands has been made. It has been found that the compound has five absorption bands above 210 mμ. The existence of the additional 300 mμ band of fluorene has been explained theoretically by increasing the ionization potentials of the 9- and 10-carbon atoms by 3 eV from the usual value (11.42 eV).