bluuebunny/crossref_metadata_2025_split huggingface dataset:
Photochemistry of Metal-Metal Bonded Compounds. I. Isolation and X-Ray Molecular Structure Analyses of Orthometalated Triphenyl Phosphite Manganese Carbonyl Derivatives and Reaction Mechanisms of Orthometalation from Photodegradation of Manganese Carbonyl Derivatives with Sn–Mn Bond
Authors: Onaka Satoru , Kondo Yoshinori , Furuichi Nobuhiro , Toriumi Koshiro , Ito Tasuku 
Published: July 2006

Abstract
Photochemical degradation of a series of tin-manganese bonded complexes was studied. The apparent reactivity of the tin-manganese bond toward UV irradiation is interpreted on the basis of absorption spectra of relevant complexes and available emissions from the light source. Two kinds of orthometalated products were obtained from photolysis of Me3Sn–Mn(CO)3[P(OPh)3]2 in benzene. Various kinds of experiments suggest that their photochemical reactions proceed through homolytic cleavage of the Sn–Mn bond in the initial stage and the resulting 15-electron intermediates abstract hydrogen from the triphenyl phosphite moiety. Molecular structures of the two kinds of orthometalated products, as clarified by X-ray structure analyses, are described.
The Formation of Needle-like Particles of xCoFe2O4·(1−x)Fe3O4 with x≤0.2
Authors: Kiyama Masao , Takada Toshio 
Published: July 2006

Abstract
An experimental study was made of the oxidation with air of alkaline suspensions containing needle-like Fe3O4 particles and slight amounts of Co1⁄3/Fe2⁄3(OH)2 at temperatures between 60 and 90 °C, together with the properties of the resulting oxidation products. It has been found that the Hc (coercivity) values of the products were greatly affected by both the excess NaOH concentration and the oxidation temperature—i.e., the two essential factors in determining the difference in the properties of a cobalt ferrite layer coated on the Fe3O4 particles, that these values increased with the heat treatment in vacuo of the products within the temperature range of 200 to 450 °C, without decreasing the saturation magnetization values, and that the Hc increment was mainly governed by the Co content.
Potentiometric Study of Heteropolyanion Formation from Dimethylarsinate and Molybdate Anions in Acidic Aqueous Solution
Authors: Takahama Hironobu , Sasaki Yukiyoshi 
Published: July 2006

Abstract
The equilibria, pH++qMoO42−+r(CH3)2AsO2−=(H+)p(MoO42−)q[(CH3)2AsO2−]r were studied by the use of a glass electrode in 1 M Na(Cl) ionic medium at 25 °C. The data were explained by assuming two heteropolyanions of the compositions, (p,q,r)=(6,4,1) and (7,4,1) with the formation constants logβ6,4,1=39.8±0.02 and logβ7,4,1=46.03±0.01.
Mössbauer Studies of Thermal Decomposition of Hexaamminecobalt(III) Hexacyanoferrate(III) and Hexaamminecobalt(III) Hexachloroferrate(III) in Air and in Nitrogen Atmosphere
Authors: Brar Ajaib Singh , Brar Sarvjit , Sandhu Sarjit Singh 
Published: July 2006

Abstract
Thermal decomposition of hexaamminecobalt(III) hexacyanoferrate(III) (1) and hexaamminecobalt(III) hexachloroferrate(III) (2) in air as well as in nitrogen atmosphere was studied by using Mössbauer spectroscopy, TGA, DTA, IR spectroscopy, and magnetic susceptibility measurement. 1, when heated in air, is stable up to 200 °C and then converted into hexacyanoferrate(II) and finally to ferrites; in inert atmosphere iron metal and carbides are formed above 400 °C. 2 in air is reduced to iron(II) species and finally to ferrites; in inert atmosphere ligand exchange takes place forming cobalt(II) chloride. A mechanism is proposed for the decompositions of 1 and 2.
Analytical Extraction of Uranium with TOPO from Sea Water
Authors: Degetto Sandro , Faggin Mario , Moresco Anna , Baracco Livio 
Published: July 2006

Abstract
A distribution study was carried out on the extraction behaviour of uranium in sea water using solutions of TOPO in cyclohexane. The influence of various factors (time, pH, TOPO concn in the organic phase, nitrate or chloride concentration in the aqueous phase and volumetric ratio between the two phases) on the extractability of uranium was investigated. In view of the results obtained, the best conditions for a quantitative recovery were selected. The application of the results to fluorimetric determination of uranium is also reported.
A Kinetic Study on the Oxychlorination of Benzene
Authors: Blanco Jesus , Avila Pedro , Melo Francisco Vicente 
Published: July 2006

Abstract
Gas-phase benzene oxychlorination was carried out over a CuCl2–CeCl3/Al2O3 catalyst. A kinetic model is proposed which permits us to obtain a rate equation capable of reproducing experimental results. The presence of cerium in the catalyst increases the reaction rate and maintains the conversion level for a long time. It seems that this element facilitates copper reoxidation by making the total rate independent of the partial pressure of oxygen and stabilizes the active phase of the catalyst.
Barium Manganate. A Versatile Oxidant in Organic Synthesis
Authors: Firouzabadi Habib , Mostafavipoor Zohreh 
Published: July 2006

Abstract
Preparation of barium manganate in large-scale is discussed. It is also shown that this reagent is capable of oxidizing organic substrates, converting alcohols to their corresponding carbonyl compounds, aromatic amines to their corresponding azo compounds, hydroquinone to p-benzoquinone, benzylamine to benzaldehyde, and triphenylphosphine to its oxide in good yields. Saturated hydrocarbons, unsaturated hydrocarbons, unsaturated ketones, and saturated amines are not affected by this reagent in a reasonable reaction time.
Laser Stark Spectroscopy of AsH3 Using 9.4 and 10.6 μm CO2 Laser
Authors: Nakagawa Kuniaki , Ueda Yoshifumi , Kuchitsu Kozo 
Published: July 2006

Abstract
Perturbation-allowed transitions of the v2 and v4 bands of AsH3 were observed. About 100 Stark components were assigned to six Δ(k-l)=0, six Δ(k-l)=±3, and three Δ(k-l)=±6 transitions. The Stark patterns and hyperfine splittings were used for confirming the assignment.
Production of Hydrogen by Photochemical Splitting of Water Using Diammonium Tetrathiomolybdate as Photocatalyst
Authors: Bhattacharya A , Basu J , Das K , Bhattacharyya R G , Chatterjee A B , Rohatgi-Mukherjee K K 
Published: July 2006

Abstract
Hydrogen gas is generated at the cathode when the anode compartment of a photogalvanic cell anode/(NH4)2MoS4(aq, satd.)//5M HCl (aq)/cathode is illuminated. The photocurrent generated rises slowly with time and reaches a limiting value. A mechanism is suggested involving the conversion of Mo(VI) to Mo(V) and the formation of OH radicals, as evidenced by development of paramagnetism on irradiation. Although the photocatalyst is susceptible to hydrolysis, it can be easily regenerated by passing H2S.
Properties of Alkali-free Magnesium Phosphate Glass Membranes Containing Silver Oxide and Their Application to the Ammonia Selective Electrode
Authors: Nomura Tsuyoshi , Nakagawa Genkichi 
Published: July 2006

Abstract
The properties of magnesium phosphate glass and the potential response of its membrane to ammonia were studied. The most suitable glass composition for the ammonia selective electrode is 5Ag2O–50P2O5–40MgO–5Al2O3. The potential-concentration curve of the electrode exhibits a slope of about 48 mV/decade for the ammoniaconcentration range of (10−2–10−6) mol/dm3.
The Solvent Extraction-Spectrophotometric Determination of Perchlorate Ions with Monoethynolog of Malachite Green
Authors: Akiyama Shuzo , Nakashima Kenichiro , Nakatsuji Shin’ichi , Hamada Makiko , Izaki Yayoi 
Published: July 2006

Abstract
By the use of a new reagent, 1,1-bis(p-dimethylaminophenyl)-3-phenyl-2-propynylium chloride, i.e., one of the ethynologs of Malachite Green, micro amounts of perchlorate ions could be extracted into chlorobenzene and determined spectrophotometrically. Beer’s law holds over the range of 4×10−6–2.5×10−5 M (M=1 mol dm−3); ε=4.0×104 dm3 mol−1 cm−1 at 690 nm.
The Crystal Structure of the 1-(2-Carboxyethyl)uracil : Phenethylamine(1:1) Complex
Authors: Ishida Toshimasa , Yamamoto Keizo , Inoue Masatoshi 
Published: July 2006

Abstract
The crystal of the title complex is monoclinic, with a space group of Cc, a=5.678(1), b=33.814(7), c=8.058(2) Å, β=103.42(1)°, and Z=4. The two component molecules are linked to each other by hydrogen bonds between the amino and carboxyl groups. No prominent interaction was observed between benzene and uracil rings.
Primary Structure and Molecular Evolution of Intestinal Calcium-binding Protein
Authors: Iida Yôichi 
Published: July 2006

Abstract
The primary structure and the molecular evolution of protein were examined with bovine and porcine intestinal calcium-binding protein (ICaBP). The amino acid sequence of this protein was compared with that of ancestral calmodulin, which had been predicted as the most ancient form in the family of calcium-binding proteins.
Phase Behavior and Tricritical Phenomena in a Bile Salt System
Authors: Kunieda Hironobu , Shinoda K\={o}z\={o} 
Published: July 2006

Abstract
A three-phase region consisted of a water (W), a surfactant (D) and an oil (O) phases was found in a sodium taurocholate (NaTC)/brine/co-surfactant (monoglyceride or its model compound)/oil (triglyceride) system. A required concentration of cosurfactant to produce the three-phase region was decreased with increasing salinity. The three-phase region becomes narrower and finally vanishes with decreasing salinity at constant temperature or with the rise in temperature at constant salinity in a NaTC/brine/glycerol mono (2-ethylhexyl) ether/glycerol tris (2-ethylhexanoic) ester system. Since the critical end points of O–D and D–W phases approach and coincide in the system, the three-phase region disappears at a tricritical point at which three coexisting liquid phases become identical. According to the phase rule, there is a line of tricritical points in the space of T and compositions in this five-component system and it moves toward higher temperatures with the increase in salinity. Therefore, the three-phase region exists at temperatures below the tricritical temperature at constant salinity.
The Dehydrogenation of Nickel(II) Chelates of rac- and meso- 2,2′-[(1,2-Diphenylethylene)bis(iminomethylene)]diphenol and Related Compounds
Authors: Kanatomi Hajime 
Published: July 2006

Abstract
Nickel(II) acetate tetrahydrate and rac- and meso-2,2′-[(1,2-diphenylethylene)bis(iminomethylene)]diphenol (rac- and meso-BzPhen-H2) formed pale green complexes in methanol. A pyridine solution of these complexes deposited deep red diimine complexes after prolonged heating under aerobic conditions. The saturated ligand system of the initial complexes was dehydrogenated to an unsaturated one by molecular oxygen. From the pyridine solution of the meso-isomzr, [2,2′-(cis-1,2-diphenylethenylene)bis(nitrilomethylidyne)diphenolato]nickel(II)([Ni(SalStil)]) was isolated in addition to the diimine complex ([Ni(meso-SalPhen)]). In this case, the (Remark: Graphics omitted.) bridge was dehydrogenated to (Remark: Graphics omitted.) conjugated double bonds; that is, a fully conjugated metal chelate was formed by the dehydrogenation of the coordinated ligand.
A Potential-step Chronoamperometric Study of Ion Transfer at the Water/Nitrobenzene Interface
Authors: Kakutani Tadaaki , Osakai Toshiyuki , Senda Mitsugi 
Published: July 2006

Abstract
Potential-step chronoamperometry, cyclic voltammetry, and chronopotentiometry have been applied to the study of the transfer of the tetramethylammonium (TMA+) ion across the interface between a 0.1 mol dm−3 lithium chloride aqueous solution and a 0.1 mol dm−3 tetrabutylammonium tetraphenylborate nitrobenzene solution. An analysis of the current-time and current-potential curves obtained by means of potential-step chronoamperometry indicates that the transfer of the TMA+ ion across the water/nitrobenzene interface is a reversible diffusion-controlled process, which can be explained by the theory of the chronoamperometry of a reversible charge transfer at the electrode surface. The values of the diffusion coefficient of the TMA+ ion in the aqueous phase and of the reversible half-wave potential of the TMA+ ion transfer, as determined by means of potential-step chronoamperometry, agreed well with those determined by means of cyclic voltammetry and chronopotentiometry.
The Adsorption of Polypeptides on Polystyrene Latices and Their Effects on Colloid Stability
Authors: Furusawa Kunio , Sakai Hidetoshi , Watanabe Noribumi , Tomotsu Norio 
Published: July 2006

Abstract
The adsorption behavior of poly(l-lysine) and poly(l-glutamic acid) on negatively and positively charged latices was examined in combination with their stabilizing effects on the latex dispersion. It was realized that the polypeptide adsorption was, to a large extent, determined by the coulombic interaction between the polypeptide and the charged surface, and by the conformational change (helix-coil transition) in the polypeptide in the solution. The flocculation behavior of the dispersion in the presence of polypeptide was also explained reasonably by taking account of the results of electrophoretic measurements of the polypeptide-coated particles.
Kinetic Isotope and Pressure Effects in the Reaction of Leucocrystal Violet with Tetracyanoethylene and Chloranil
Authors: Nishimura Norio , Motoyama Takushi 
Published: July 2006

Abstract
The rates of reaction of Leucocrystal Violet (LCV) with chloranil (CA) and tetracyanoethylene (TCNE) were measured, and the kinetic isotope and pressure effects were examined. In the LCV–CA system, a very large isotope effect (kH⁄kD≈11) was observed, while in the LCV–TCNE system, it was not so large (kH⁄kD=5–6) suggesting the tunnel effect is not substantial. For both systems, the formation of a CT complex in equilibrium with the reactants was observed at low temperatures (&lt;−50 °C). From the rate law, the isotope effect, the electronic and ESR spectra observed during the reaction, and their time dependence, possible reaction processes are proposed.
Reactions of trans-Chloro(cyanomethyl)bis(triphenylphosphine)- and Chloro(cyanomethyl){1,2-bis(diphenylphosphino)ethane}palladium(II) Complexes with Various Thallium(I) β-Diketonates
Authors: Ishio Noriaki , Nakamura Yukio , Okeya Seichi 
Published: July 2006

Abstract
Reactions of trans-chloro(cyanomethyl)bis(triphenylphosphine)palladium(II), trans-[PdCl(CH2CN)(PPh3)2] (1), with an equimolecular amount of Tl(β-dik) (β-dik=etac, acac, tfac, bzac, and dbm) in dichloromethane afforded the O,O′-chelated β-dik complexes [Pd(CH2CN)(β-dik)(PPh3)] (3). Hydrogen peroxide oxidation and chloride abstraction by AgClO4 or AgBF4 of 1 gave the neutral [PdCl(CH2CN)PPh3]n and the cationic [Pd(CH2CN)(PPh3)2]mXm (X=ClO4 or BF4), respectively, from either of which complexes 3 were also obtained by the reactions with the β-dik anions. No pure product corresponding to 3 was isolated by a similar treatment of 1 with Tl(hfac). On the other hand, chloro(cyanomethyl){1,2-bis(diphenylphosphino)ethane}palladium(II), [PdCl(CH2CN)(dppe)] (2), reacted only with Tl(hfac) in refluxing acetone to give the cationic [Pd(CH2CN)(dppe)]2(hfac)2, which was also derived from 2 via [Pd(CH2CN)(dppe)]2X2 (X=ClO4 or BF4).
Reaction of Organoboranes with Lead(IV) Acetate Azide. A Synthesis of Azidoalkanes from Alkenes via Hydroboration
Authors: Masuda Yuzuru , Hoshi Masayuki , Arase Akira 
Published: July 2006

Abstract
Trialkylboranes prepared from alkenes via hydroboration react with lead(IV) acetate azide in dichloromethane at −25 °C to form the corresponding azidoalkanes in a one-pot manner. One or two of the alkyl groups of trialkylboranes are utilized in the reaction. For example, 1-azidohexane is afforded from 1-hexene in 50% yield based on the alkene employed.
Nonacarbonyldiiron or Pentacarbonyliron Induced Decomposition of Organic Azides and an Azirine. Novel Reduction and Carbonyl Insertion of the Complexed Nitrene Intermediate in Protic Solvents
Authors: Nitta Makoto , Kobayashi Tomoshige 
Published: July 2006

Abstract
The thermal reactions of [Fe2(CO)9] or the photochemical reactions of [Fe(CO)5] with organic azides and an azirine in protic media have been investigated. The thermal reaction of azidobenzene (1) with [Fe2(CO)9] in methanol under mild conditions gave aniline and methyl phenylcarbamate, along with N,N′-diphenylurea, while in the presence of water, 1 afforded aniline and N,N′-diphenylurea, in good combined yield. Similarly, the thermal reaction of α-azidostyrene (4) with [Fe2(CO)9] in methanol gave methyl 1-phenylvinylcarbamate and acetophenone which could be derived from the corresponding enamine, while in the presence of water, 4 gave only acetophenone in good yield. The photoirradiation of [Fe(CO)5] with 1 or 4 also gave results similar to the [Fe2(CO)9]-induced reaction. However, the thermal reaction of 3-phenyl-2H-azirine (5) with [Fe2(CO)9] in methanol gave 2,5-diphenylpyrazine in low yield, in addition to acetophenone and methyl 1-phenyl-vinylcarbemate, although 5 afforded only acetophenone in the presence of water. The reaction pathways for the formation of the products are discussed on the basis of the formation of a complexed nitrene intermediate, reduction of which induces amine or enamine and carbonyl insertion to yield an organic isocyanate in protic media.
Stereoselective Catalytic Hydrogenation of α-Hydroxy Ketoximes
Authors: Harada Kaoru , Shiono Shozo 
Published: July 2006

Abstract
Two isomers(E and Z) of benzoin oxime and 2-hydroxy-1-phenyl-1-propanone oxime were catalytically hydrogenated by using palladium on charcoal and erythro amino alcohols were obtained in about 80% diastereomeric excess. The syn-anti isomerization of these oximes in the presence of palladium on charcoal was also studied in connection with the stereoselectivity of the catalytic hydrogenation of the oximes.
Effects of Surface Fluorination on Catalytic Activities and Surface Compositions of TiO2–Al2O3 and TiO2–SiO2–Al2O3
Authors: Okazaki Susumu , Kurosaki Akito , Suzaki Shinzo 
Published: July 2006

Abstract
Studies showed that the ternary oxide having the atomic ratio of Ti/Si/Al=47.5/47.5/5 exhibited a high catalytic activity for cumene cracking after a surface fluorination using 1 wt% hydrofluoric acid. The catalytic activity for CH3OH conversion into olefins was highly dependent on the preparation method. That is, the ternary mixed oxide promoted olefin formation slightly when the mixed oxide was prepared only by coprecipitation. Surface treatment, using gaseous CF3Cl was effective in enhancing catalytic activity. Although the binary oxide, TiO2–Al2O3, itself, was catalytically inactive for olefin formation, TiO2–Al2O3 prepared by coprecipitation became active after the treatment using CF3Cl. Such an enhancement was found also for the ternary oxide, TiO2–SiO2–Al2O3, and is ascribable to increased acid strength, as determined by NH3 adsorptions at various temperatures. The XPS measurements showed that F atoms introduced into mixed metal oxides by the fluorination using CF3Cl, selectively combined with Al atoms on the mixed oxides prepared by coprecipitation. The XPS measurements of the mixed oxides before and after fluorination using CF3Cl showed that the coprecipitation preparation is more preferable than the impregnation method in maintaining surface composition during fluorination.
Thermodynamic Study on Solvent Extraction of Alkali Metal Picrates by 15-Crown-5
Authors: Takeda Yasuyuki , Namisaki Tsuyoshi , Fujiwara Shizuo 
Published: July 2006

Abstract
In order to obtain enthalpy (ΔH1°) and entropy changes (ΔS1°) for overall extraction reactions of 15-crown-5 (15C5) with alkali metal picrates between benzene and water, and those (ΔH2° and ΔS2°) for partition of 15C5 itself, overall extraction equilibrium constants of 1:1:1 complexes of 15C5 with the salts and distribution coefficients of 15C5 were determined at 20, 30, 35, and 40 °C. The ΔH1° and ΔS1° values of 15C5 for the alkali metals are all negative. Both the ΔH2° and ΔS2° values are positive. In general, the ΔH2° and ΔS2° values play a major role in determining the magnitude of ΔH1° and ΔS1° values, respectively, except the case of entropy change for the potassium system. Enthalpy (ΔH4°) and entropy changes (ΔS4°) for ion-pair extractions of 15C5-alkali metal ion complexes by picrate anions were calculated by using the ΔH1° and ΔS1° values, and the literature values for complex-formation reactions of 15C5 with alkali metal ions in water. Both ΔH4° and ΔS4° values vary with the alkali metal ion held in the 15C5 cavity. The ΔH4° and ΔS4° values for Na+, Rb+, and Cs+ are all negative, whereas those for K+ are all positive.
Mössbauer Spectroscopic Studies of the Effects of the 6Li(n, α)T Reaction in Lithium Tris(oxalato)ferrate(III)
Authors: Akashi Junko , Uchida Yoshio , Kojima Tomoko , Katada Motomi , Sano Hirotoshi 
Published: July 2006

Abstract
The chemical effects of the 6Li(n,α)T reaction in lithium tris(oxalato)ferrate(III) crystals were examined by means of Mössbauer spectroscopy. Neutron irradiations were carried out under different conditions in order to clarify the mechanism of the effects. The reduced iron(II) species observed in the spectrum of Li3[Fe(C2O4)3]·4.5H2O, subjected to neutron irradiation (8.6×1015 n cm−2) at 200 K, shows a larger Q.S. value than that in the spectrum of the sample neutron-irradiated at an ambient temperature (300–320 K) in a reactor, suggesting that the initially produced iron(II) species changes into another iron(II) species during the irradiation at the ambient temperature. A species identical with the initial iron(II) species produced in the neutron irradiation was found to be prepared by the pyrolysis of Li3[Fe(C2O4)3]·4.5H2O. A comparison of neutron-irradiated hydrous and anhydrous Li3[Fe(C2O4)3] suggests that the change in the iron(II) species is influenced by the existence of crystal water.
Cross-coupling Reaction between Enol Phosphates and Organoaluminium Compounds in the Presence of Palladium(0) Catalyst
Authors: Takai Kazuhiko , Sato Mitsuyoshi , Oshima Koichiro , Nozaki Hitosi 
Published: July 2006

Abstract
The title reaction in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) affords alkylative coupling products in good to excellent yields in 1,2-dichloroethane at room temperature. This coupling reaction under C(sp2)–O cleavage proceeds stereospecifically. The reaction does not affect a coexisting vinyl sulfide group. This feature enables 1,2- and 1,3-carbonyl transposition with or without alkylation via phenylthio-substituted enol phosphates.
Kinetic Trace Determination of Molybdenum(VI), l-Ascorbic Acid, and Thiosulfate Using Landolt Reaction by the Aid of Fluorometry
Authors: Kataoka Masamitsu , Hemmi Hirotoshi , Kambara Tomihito 
Published: July 2006

Abstract
Trace amounts of molybdenum(VI) can be determined by the use of their catalytic effects on the peroxoborate–iodide redox reaction in acidic medium. The indicator reaction is transformed to a Landolt reaction by the addition of ascorbic acid into the reaction mixture, i.e., the iodine produced by the reaction is immediately reduced by ascorbic acid. The end of the induction period of the Landolt process was fluorometrically detected by the aid of disappearence of fluorescence of Rhodamine B. Trace determination of molybdenum(VI) was carried out by employing the linear relationship between the reciprocal of induction period and catalyst concentration. The most suitable concentrations of sodium peroxoborate, potassium iodide, and hydrochloric acid in the reaction mixture were found to be 9 mM, 0.1 M, and 0.1 M, respectively. By this method, molybdenum(VI) can be determined from 80 nM to 10 mM (7.675 ng ml−1 to 95.95 mg ml−1). The effect of foreign ions were studied and an equal amount of tungsten(VI), and 10-fold amounts of zirconium(IV), iron(II), iron(III), vanadium(IV), and copper(II) were found to show interference. Ascorbic acid and thiosulfate in micro mol l−1 levels were also determined by the present method employing the linear relationship between the induction period and the reductant concentration.