bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis, Characterization, and Crystal Structure of Substituted Derivatives of (Tetraazacyclotetradecatetraenato)copper(II) Complexes
Authors: Matsumoto Naohide , Imaizumi Masahiko , Ohyoshi Akira 
Published: July 2006

Abstract
(Tetraazacyclotetradecatetraenato)copper(II) complexes with the general formula [Cu(Me2E2[14]tetraenatoN4)], where E denotes the substituent group of acetyl, propionyl, isobutyryl, benzoyl, p-methylbenzoyl, or p-nitrobenzoyl, have been prepared via electrophilic substitution of the parent complex [cu(Me2[14]tetraenatoN4)] with acid chlorides, and characterized by elemental analyses and infrared spectra. For the p-substituted benzoyl derivatives, both the position of d-d electronic band maxima and reduction potential assignable to Cu2+e→Cu+ vary linearly with the Hammett substituent constants. The crystal structure of one of the complexes [Cu(Me2Acyl2[14]tetraenato)4]·H2O has been determined by the single-crystal X-ray diffraction method. The copper atom assumes a square planar coordination geometry and the overall conformation of the complex assumes a chair-like shape, where the seat and the rests are formed by the coordination plane (CuN4) and the two conjugated six-membered chelate rings respectively.
Polarographic Behavior of Cobalt-1-Nitroso-2-naphthol Complex in Ammonium Citrate and Tartrate Solutions
Authors: Sugawara Masao , Uchida Toyoaki , Kambara Tomihito 
Published: July 2006

Abstract
The reduction behavior of cobalt(II) in ammonium citrate and tartrate solutions containing 1-nitroso-2-naphthol was investigated by means of d.c, a.c, normal and differential pulse polarography (n. p. p. and d. p. p.). When cobalt(II) is added to the supporting electrolyte of citrate or tartrate in the presence of the nitrosonaphthol, the reduction potential of 1-nitroso-2-naphthol shifts to a more negative value, the well-defined a. c. and d. p. p. peaks appearing. The drop time-potential curve indicated that adsorption of nitrosonaphthol as well as its reduction product at the mercury surface occurs. The analytical potentiality of the use of nitrosonaphthol for the microdetermination of cobalt(II) is also described.
Aldol Condensations Catalyzed by Co(II) Complexes of Pyridine-containing Copolymers
Authors: Watanabe Ken-ichi , Imazawa Atsushi 
Published: July 2006

Abstract
The cross aldol condensations of aldehydes and ketones catalyzed by Co(II) complexes of pyridine-containing copolymers proceed under neutral conditions in DMF or DMSO to afford α,β-unsaturated ketones without any byproduct. The solid complex catalysts are capable of repeated use. The reactions of aromatic aldehydes and ketones give good results but not those of aliphatic compounds. Effects of substituent groups in chalcone formation are observed. The catalytic reaction features with the polymer-complex catalysts are compared with that with Co(II)–pyridine complex. The polymer-complex-catalyzed aldol condensations are discussed briefly in relation to the enzymatic reaction of Class II aldolase (metalloenzyme).
Zero-field Splitting Tensor and Orientation of the Phosphorescent-state Benzo[h]quinoline in Biphenyl Host
Authors: Sekiya Hiroshi , Gondo Yasuhiko 
Published: July 2006

Abstract
ESR absorption has been observed in a single-crystal solid solution of benzo[h]quinoline in biphenyl under UV irradiation at 120 K. The triplet-state zerofield splitting tensor and the guest orientation are reported, in comparison with the previous results on benzo[f]quinoline.
Reactivities of Stable Rotamers. XI. Rotamer Distributions and Some Addition Reactions to the Carbonyl in 9-[2-(Substituted carbonyl)-1-naphthyl]fluorene Rotamers
Authors: Saito Ryo , Oki Michinori 
Published: July 2006

Abstract
Rotational isomers (sp and ap) of several 9-[2-(substituted carbonyl)-1-naphthyl]fluorenes where the substituent is methyl, phenyl, hydroxyl, methoxyl, 1-imidazolyl, or others have been obtained as stable entities. Barriers to rotation in these compounds were ca. 26.5 kcal for the process sp→ap but those for the reverse (ap→sp) were dependent on the substituent, ranging from 23.8 to 25.3 kcal/mol at 55 °C. The difference is reflected in the populations of rotamers: if the substituent is a hydroxyl, the sp/ap value becomes as large as ca. 20. The relative instability of the ap form was attributed to twisting of the carbonyl plane from that of naphthalene. Infrared spectra support the twisting. Addition reactions to the carbonyl occur smoothly in the sp conformation but they do not occur to a detectable extent in the ap conformation, if the substituent on the carbonyl is larger than hydrogen. The results are attributed to the steric effect of the fluorene ring.
The Ammonolysis of Trichloroethylene to Glycine
Authors: Inoue Masami , Enomoto Saburo 
Published: July 2006

Abstract
Glycine was obtained by the ammonolysis of trichloroethylene with aqueous ammonia. Various alkalines, such as alkaline metal hydroxides, carbonates, and hydrogencarbonates, accelerated the reaction; the yield of glycine was 40–70% after a 4 h reaction at 180 °C. Our results on the effect of alkalines indicate that ammonolysis proceeded sequentially via the formation of aminoacetonitrile. A good yield of the intermediate compound, aminoacetonitrile, was obtained by heating trichloroethylene at 70 °C with anhydrous ammonia under reaction conditions.
The Reactions of Singlet NH Radicals with Methyl and Ethyl Alcohols in the Liquid Phase
Authors: Kawai Jun , Tsunashima Shigeru , Sato Shin 
Published: July 2006

Abstract
The reactions of the singlet NH(a1Δ) radicals with alcohols were studied by the photolyses of hydrogen azide in liquid methyl and ethyl alcohols at the temperature of Dry Ice–methyl alcohol and at 0 °C. The main products were nitrogen, ammonia, and oxime ethers; acetaldehyde oxime O-ethyl ether from ethyl alcohol and formaldehyde oxime O-methyl ether from methyl alcohol. The relative yields of the products were independent of the changes in the reaction temperature and in the concentration of the hydrogen azide examined. Methoxyamine or ethoxyamine, a possible insertion product of the singlet NH into the O–H bond of alcohol, was detected as a form of oxime ether by the reactions with the aldehyde eventually formed. It was concluded that the singlet NH radicals can effectively insert into the O–H bond of the alcohol.
Reactions of 3-Acetyltropolone and Its Methyl Ethers with o-Aminophenol
Authors: Imafuku Kimiaki , Shigenobu Akihiro , Ogura Makoto 
Published: July 2006

Abstract
3-Acetyltropolone (1) and 2-acetyl-7-methoxytropone (2a) reacted with o-aminophenol in ethanol to afford 2-acetyl-7-(o-hydroxyanilino)tropone (3). The reaction of 3-acetyl-2-methoxytropone (2b) gave 3-acetyl-2-(o-hydroxyanilino)tropone (5). The compounds 3 and 5 were cyclized to 6-acetyl- and 10-acetylcyclohepta[b][1,4]benzoxazines (4 and 6), respectively, by heating their acetic acid solutions in the presence of a trace amount of concentrated sulfuric acid. The compounds 4 and 6 were also obtained directly from 1 (or 2a) and 2b, respectively, by the reaction with o-aminophenol in acetic acid. The compound 5 exists as a tautomeric mixture with 5′.
Photosensitized Desulfurization of Heterocyclic Thioketones and Its Accompanied Chemiluminescence
Authors: Suzuki Nobutaka , Sano Kaniti , Wakatsuki Satoshi , Tani Noriyuki , Izawa Yasuji 
Published: July 2006

Abstract
Photosensitized oxygenation of 10-methyl-9(10H)-acridinethione, 9H-xanthene-9-thione, and 9H-thioxanthene-9-thione at −78 °C gave the corresponding ketones, 10-methyl-9(10H)-acridinone, 9H-xanthen-9-one, and 9H-thioxanthen-9-one quantitatively in a 3–10 min-irradiation. Weak chemiluminescence was observed from the irradiated solution upon warming-up.
The Investigation of Energy Efficiency of the ZnO Semiconductor Photoelectrode by Photothermal Measurement
Authors: Maeda Yasuhisa , Fujishima Akira , Honda Kenichi 
Published: July 2006

Abstract
The energy efficiency of a polycrystalline ZnO photoanode in an electrolyte solution containing redox agents was investigated by measuring the temperature change of the electrode surface. The results of photothermal measurements show that the energy efficiency depends on the kind of redox agents used. Reducing agents with more positive potentials gave larger energy efficiencies, but the potential must be negative enough to decrease ZnO dissolution.
Kinetic Studies of the Micelle System of Octylammonium Alkanoates in Hexane Solution by the Ultrasonic Absorption Method
Authors: Yamashita Teruyo , Yano Hiroshige , Harada Shoji , Yasunaga Tatsuya 
Published: July 2006

Abstract
Ultrasonic absorption was measured in hexane solutions of octylammonium alkanoates (nonanoate, decanoate, dodecanoate, and tetradecanoate). The value of critical micelle concentration (CMC) was determined to be 0.02 M (1 M=1 mol dm−3) for all the surfactants. The excess ultrasonic absorption, observed in the solutions above the CMC, was ascribed to the association-dissociation of the monomer to and from the micelle. From the concentration dependences of the ultrasonic parameters, the mean aggregation number of the micelle, the rate constants, and the enthalpy change of the above reaction were obtained. These results were discussed in relation to the shape of the reversed micelle and the solute-solvent interactions.
The Complex Formation of Poly(N-vinylpyrrolidone) with Manganese Dodecyl Sulfate in Water Studied by ESR
Authors: Aizawa Masayuki , Komatsu Tsuyoshi , Nakagawa Tsurutaro 
Published: July 2006

Abstract
ESR measurements of Mn2+ ions in aqueous manganese dodecyl sulfate (Mn(DS)2) solutions with or without 0.05% poly(N-vinylpyrrolidone)(PVP) were carried out at 30 °C. The dependences of linewidths and of absorption intensities on the Mn(DS)2 concentration in (Mn(DS)2+0.05% PVP) solutions changed abruptly at a concentration where a PVP–Mn(DS)2 complex begins to form. The same dependence in Mn(DS)2 solutions was found around the CMC of Mn(DS)2 in water. From the quantitative analysis of the data obtained, it was concluded that the Mn(DS)2 molecules in the complex form a nearly micelle-like aggregate, and that most of Mn2+ ions bound onto the micelle-like aggregate or the Mn(DS)2 micelle exist in the Stern layer. In addition, the PVP concentration dependence of the similar quantities in (Mn(DS)2+PVP) solutions with a constant Mn(DS)2 concentration suggested that the polymer-surfactant complex changes its structure at higher PVP concentrations.
Preparation and Electrochemical Behaviors of Phenoxide-coordinated Iron(III) Porphyrins
Authors: Sugimoto Hiroshi , Ueda Nobuhiro , Mori Masayasu 
Published: July 2006

Abstract
A new series of iron(III) porphyrins having various phenoxide anions as the axial ligand, [FeIII(porphyrin)(4-X–C6H4O−)] (porphyrin=octaethylporphyrin and tetraphenylporphyrin; X=OCH3, CH3, H, C6H5, Cl, Br, COCH3, CN, CHO, and NO2) were synthesized. All these complexes are five-coordinated high-spin complexes (S=5⁄2). Their electrochemical behaviors were investigated by the cyclic voltammetry and the controlled potential coulometry. The complexes showed significantly negative potentials for the FeII/FeIII redox couple (−0.4–−0.8 V). A good linear relationship was found between the half-wave potentials of the FeII/FeIII redox couple and the Hammett σ-values of the substituent X. A new characteristic feature is the appearance of the redox peaks of the coordinated phenoxide anions near the redox couple of the porphyrin ring oxidoreduction. The role of the tyrosine-67 in the enzymatic mechanism for cytochrome c is discussed.
Reduction of Aromatic Compounds by Solvated Electrons Generated at Cathode
Authors: Misra Ram A , Yadav Ashok K 
Published: July 2006

Abstract
Phenol, anisole, and toluene can be reduced electrochemically to cyclohexanol, methoxycyclohexane, and methylcyclohexane respectively, in ethanol containing hexamethylphosphoric triamide (HMPA) at aluminium cathode. The reduction of these aromatics is believed to occur due to electrochemically generated solvated electrons.
Additive Effect of CF3Cl on an Oxidation Reaction in Shock Waves. I. Study with H2–O2
Authors: Hidaka Yoshiaki , Kawano Hiroyuki , Suga Masao 
Published: July 2006

Abstract
Sample gases, H2–O2, H2–O2–CF3Cl, and CF3Cl, highly diluted with Ar were heated behind reflected shock waves over the temperature range 1400–2200 K and an additive effect of CF3Cl at various concentrations (0–0.5%) was studied by monitoring ultraviolet and visible emissions. At a temperature below 2200 K, C2* and CH* species were found to be formed in the oxidation reaction of H2 together with CF3Cl, but hardly formed in the thermal decomposition of CF3Cl. The addition of small and large amounts of CF3Cl increased and decreased, respectively, the intensity of OH* emission from the H2–O2 mixture heated to a constant temperature. An ignition delay time at a fixed temperature above 1400 K was found to shorten with an increase in the concentration of CF3Cl. A brief discussion is given of the mechanism for the formation of the chemiluminescent species.
The Dechlorination of Polychlorinated Biphenyls by UV-irradiation. VIII. Reactions of 2,3- and 3,4-Dichlorobiphenyl in a 2-Propanol Solution
Authors: Nishiwaki Tohru , Shinoda Tsutomu , Anda Kinji , Hida Mitsuhiko 
Published: July 2006

Abstract
The photodechlorinations of 2,3-dichlorobiphenyl (2,3-DCB) and 3,4-dichlorobiphenyl (3,4-DCB) in 2-propanol gave 3-chlorobiphenyl and 4-chlorobiphenyl respectively. The quantum yields of monochlorobiphenyl formation were 0.2 for 2,3-DCB and 0.06 for 3,4-DCB, independent of the substrate concentration and the wavelength of the exciting light. On the basis of the results obtained in quenching experiments using cis-1,3-pentadiene, it was concluded that 2,3-DCB was photodechlorinated exclusively in the excited singlet state, while 3,4-DCB was photodechlorinated in both excited singlet and triplet states. In the case of 3,4-DCB, the relative contributions of excited singlet and triplet states to the total dechlorination were evaluated as 0.8 and 0.2 respectively. The participation of the excited triplet state in the photodechlorination of 3,4-DCB was ascertained both by quenching reactions with biacetyl as a quencher and by photosensitized dechlorinations with acetone and acetophenone as sensitizers.
Infrared Spectra and Conformation of N-Acetylthiourea
Authors: Aruna Srinivasan , Shanmugam Guruswamy , Manogaran Sadasivam , Sathyanarayana D N 
Published: July 2006

Abstract
Infrared spectra of N-acetylthiourea (ATU) and its N,N,N′-trideuterated compound have been examined in the range 4000–50 cm−1. A complete vibrational assignment with a normal coordinate treatment based on a Urey-Bradley type intramolecular potential function supplemented with valence force function for the out of plane and torsional modes is proposed and the feature of the thioureido vibrations explained. A molecular orbital study by the CNDO/2 method of ATU and its oxygen analog is undertaken and the results are analyzed for a comparative study of the molecular electronic structure and conformation.
Reference Materials for the Pyrolysis Gas-chromatographic Determination of Ammonia, Nitrogen, Nitrogen Monoxide, Carbon Monoxide, and Carbon Dioxide
Authors: Miyokawa Kikuo , Abe Naoki , Masuda Isao 
Published: July 2006

Abstract
Four compounds are proposed as the reference materials to calibrate the pyrolysis gas chromatograph in the determination of inorganic gases: [Co(NH3)5Cl]Cl2 for NH3, [Co(NH3)5NO2]Cl2 for N2, [Co(NH3)5NO]Cl2 for NO, and PbC2O4 for both O and CO2. On pyrolyses, the gas evolution of these compounds were stoichiometric, and the peak area corresponded fairly well to the weight of the compound. Under the condition employed, 7.3–138 μmol of NH3, 2.2–67 μmol of N2, 2.0–61 μmol of NO, 0.84–26 μmol of CO, and 2.5–76 μmol of CO2 were analyzed by using 0.5–15 mg of the compounds.
Photolysis of o-(N-Alkylacylamino)benzophenones
Authors: Hasegawa Tadashi , Kosaku Satomi , Ueno Junko , Oguchi Sh\={o}shichi 
Published: July 2006

Abstract
The photochemical reactions of o-(N-alkylacylamino)benzophenones have been studied. Photochemical behavior of the (acylamino)benzophenones was dependent on the solvent polarity. The (acylamino)benzophenones underwent photodeacylation in polar solvents and photodealkylation in nonpolar solvents.
An Effective Process for Treatment of Malodor in Exhaust Gas by Hypochlorite
Authors: Abe Kenzo , Machida Wataru 
Published: July 2006

Abstract
Pilot-plant studies were carried out to find out the optimum conditions for hypochlorite-oxidation treatment of malodorous multi-components in exhaust gas from night soil treatment plants. A two-step process was proved to be the most effective: a part of malodorous components are absorbed and oxidized in the first packed-tower into which a pH 7 aqueous solution of sodium hypochlorite slowly introduced and then unreacted components are oxidized in the second tower with a pH 11 solution.
The Wet Oxidation of Organic Compounds Catalyzed by Co–Bi Complex Oxide
Authors: Imamura Sei-ichiro , Kinunaka Hiroshi , Kawabata Nariyoshi 
Published: July 2006

Abstract
The wet oxidation of various organic compounds was carried out in the presence of the Co–Bi (5:1) complex oxide catalyst. The catalyst was especially effective for the oxidation of all refractory lower carboxylic acids, which are intermediates in the wet oxidation of many organic compounds.
Thermal Decomposition of Calcium Sulfate Dihydrate under Self-generated Atmosphere
Authors: Isa Kimio , Okuno Hiroki 
Published: July 2006

Abstract
Dehydration of calcium sulfate dihydrate was studied by means of simultaneous TG-DTG-DTA under various sealed atmospheres corresponding to three systems open, completely sealed, and quasi-sealed. Two dehydration steps could be detected under self-generated atmospheres by using 12.3, 18.7, 30.0, and 250 μm tungsten wires. This new method enables us to identify intermediates more easily than any other techniques hitherto adopted. Endothermic DTA peaks appeared earlier, at 129 and 133 °C, than the point of decreasing TG. This technique, resembling the quasi-isothermal and -isobaric thermogravimetry (Q-TG), is superior to Q-TG in that it requires smaller amounts of sample.
Preparation and Structure of μ-Oxalato-bis{μ-oxo-μ-sulfido-bis[(oxalato)oxomolybdate(V)]} Complex, K6[{Mo2O3S(ox)2}2(ox)]·10H2O
Authors: Shibahara Takashi , Ooi Shun’ichiro , Kuroya Hisao 
Published: July 2006

Abstract
The μ-oxo-μ-sulfido-(oxalato)molybdate(V) complex has been prepared and characterized by X-ray analysis. The potassium salt crystallizes in monoclinic system, space group C2/c, with cell dimensions a=13.640(3), b=20.296(3), c=15.213(4) Å, β=106.42(2)°, and Z=4. The structure was solved by the heavy-atom technique and refined by the block-diagonal least-squares method to R=0.048 for 3552 independent reflections. The complex anion is tetrameric, two dimeric Mo2O3S(ox)2 moieties being bridged by one oxalato ligand. Both the molybdenum atoms in the dimer are bridged by one sulfur and one oxygen atoms. Each molybdenum atom has distorted octahedral environment; two oxygen atoms of a bidentate oxalato ligand, bridging sulfur and oxygen atoms in the equatorial plane, a terminal oxygen and one of the bridging quadridentate oxalato ligand oxygens. The complex can be denoted as K6[{Mo2O3S(ox)2}2(ox)]·10H2O and has an approximate C2h symmetry, with a crystallographic center of symmetry. The Mo–O (quadridentate bridging oxalato) bonds (2.304(4), 2.302(4) Å) are evidently longer than the Mo–O (bidentate oxalato) bonds (2.112(4), 2.102(4), 2.093(4), 2.120(4) Å). The influence of the bridging oxalato ligand on the geometry of Mo2O3S core will be discussed.
Thermal Cis-to-Trans Isomerization of [CoX2en2]X (X=Cl, Br)
Authors: Tsuchiya Ryokichi , Uehara Akira , Muramatsu Yoshinori 
Published: July 2006

Abstract
By measuring calorimetrically the heats of reaction of solid cis- and trans-[CoX2en2]X (X=Cl, Br) with alkaline sodium sulfide solution, the heats of isomerization were obtained as −11.4 kJ mol−1 for cis-[CoCl2en2]Cl(s)=trans-[CoCl2en2]Cl(s) and −6.4 kJ mol−1 for cis-[CoBr2en2]Br(s)=trans-[CoBr2en2]Br(s). Assuming the entropy changes from cis- to trans-form, ΔS, to be −0.0116 kJ mol−1 K−1 at 25 °C statistically, the free energy changes were calculated as ΔG°=8.0 kj mol−1 and −3.0 kJ mol−1 for the isomerization of cis-[CoCl2en2]Cl and cis-[CoBr2en2]Br respectively. From these thermodynamic data, cis-to-trans isomerization was expected to occur in [CoX2en2]X (X=Cl or Br), which was verified experimentally by thin-layer chromatography and the spectral measurement.
Kinetic Studies of Solvent Extraction of Metal Complexes. VIII. Rate of Complex Formation and Solvent Extraction of Iron(III) in Aqueous Perchlorate Solutions with 1,1,1-Trifluoro-2,4-pentanedione
Authors: Sekine Tatsuya , Inaba Kazuho 
Published: July 2006

Abstract
The rate of the extraction of iron(III) in aqueous 4 mol dm−3 sodium perchlorate solutions with 1,1,1-trifluoro-2,4-pentanedione (Htfa) into carbon tetrachloride was measured, and the rate constants for the controlling reactions in the aqueous phase:
Fe3++Htfa→Fe(tfa)2++H+and Fe(OH)2++Htfa→Fe(tfa)2++H2O,
were calculated. These constants were also determined from spectrophotometric measurements of the aqueous solutions in the absence of the organic phase. The two series of rate constants obtained by the independent experiments agreed well. It was pointed out that equilibrium constants among the complexes in the aqueous and organic phases are indispensable in order to make a precise discussion of the solvent extraction of metal ions when aqueous-complex formation controls the whole process.
Chemical Effects Due to the (γ, n) Reaction and Isomeric Transition Studied by a Vacuum Sublimation Technique
Authors: Sekine Tsutomu , Sakanoue Masanobu , Nakamura Takashi , Yoshihara Kenji 
Published: July 2006

Abstract
Chemical effects of the 59Co(γ,n)58m,gCo reaction and of the isomeric transition of 58mCo in Co(acac)3, Co(acac)2, and Co(acac)2·2H2O were studied by using a vacuum sublimation technique. In the isomeric transition, highly enriched 58gCo(acac)2 was separated from 58mCo(acac)3. By the (γ,n) reaction, about a half of the radioactive nuclides produced were found in the form of Co(acac)2 after irradiation of Co(acac)3. The present results were compared with those obtained by other authors.
On the Structure of Cobalt Garnet, a New Synthetic Silicate Containing 8-Coordinated Cobalt(II)
Authors: Sone Kozo , Ohashi Haruo 
Published: July 2006

Abstract
The X-ray structure of the CoO8 unit in cobalt garnet, a new synthetic silicate of the composition Co3Al2Si3O12, is presented. The unit can be taken as a deformed cube, but its central CoII is more regularly 8-coordinated than that in [Co(NO3)4]2− studied formerly by Bergman and Cotton. The electronic spectrum and magnetic moment of cobalt garnet are discussed in comparison with those of two other silicates containing CoO4 units.
Synthesis of Cytidine, Uridine, and Adenosine 5′-(2,6-Diamino-2,6-dideoxy-α-d-glucopyranosyl diphosphates)(Neosamine C-CDP, -UDP, and -ADP)
Authors: Tadano Kin-ichi , Tsuchiya Tohru , Suami Tetsuo , Rinehart Kenneth L 
Published: July 2006

Abstract
Three potential biosynthetic intermediates for aminocyclitol antibiotics, neosamine C-CDP, -UDP, and -ADP, have been synthesized from d-glucosamine by chemical means. 2,6-Diamino-2,6-dideoxy-α-d-glucopyranosyl phosphate, derived from the corresponding glycosyl bromide, was condensed with three nucleosides (CMP, UMP and AMP) by a known procedure. The configurations of the neosamine C nucleoside diphosphates have been confirmed by 13C NMR spectra.