bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dichlorotetrakis(isocyanide)dipalladium(I) Containing a Metal–Metal Bond
Authors: Yamamoto Yasuhiro , Yamazaki Hiroshi 
Published: July 2006

Abstract
The structure of [{PdCl(t-BuNC)2}2] has been determined by X-ray diffraction. A metal–metal bond joins two Pd atoms, each of which possesses an essentially square-planar coordinate site. The photochemical reaction of [{PdCl(RNC)2}2] in CH2Cl2 led to a cleavage of the metal–metal bond to give trans-[PdCl2(t-BuNC)2].
Boron Trifluoride Etherate-catalyzed Backbone Rearrangement of 5α,10α-Epoxyalnusan-3β-yl Acetate and Partial Synthesis of Isomultiflorenol
Authors: Takai Masaki , Tori Motoo , Tsuyuki Takahiko , Takahashi Takeyoshi , Itai Akiko , Iitaka Yoichi 
Published: July 2006

Abstract
Epoxidation of alnus-5(10)-en-3β-yl acetate with m-chloroperbenzoic acid gave a 5α,10α-epoxide, treatment of which with boron trifluoride etherate afforded multiflora-5,8-dien-3β-yl acetate. On hydrogenation and hydrolysis, the diene gave isomultiflorenol.
X-Ray Photoelectron Diffraction (XPED) Studies on Metal Oxide Surfaces. (I) Analysis of the XPED Patterns from TiO2(001) and α-Al2O3(0001) by the Single Scattering Calculation
Authors: Tamura Koji , Owari Masanori , Kudo Masahiro , Nihei Yoshimasa 
Published: July 2006

Abstract
X-Ray photoelectron diffraction (XPED) measurements were applied to the (001) surface of TiO2 rutile and the (0001) surface of α-Al2O3 in order to examine the applicability of XPED to metal oxides. Obtained XPED patterns were compared with the results of theoretical calculations based on a single scattering model. The calculated patterns from both oxides agreed with the experimental patterns. It was revealed from theoretical calculations that the four oxygen atoms in the unit cell of TiO2 made different contributions to the XPED pattern which reflected different atomic environments. The same calculation was also made on titanium in TiO2, and on aluminum and oxygen in Al2O3. This clarified the contributions of nonequivalent sites of emitter atoms to the main peaks in the experimental XPED patterns. In comparison with the crystal structures, some peaks could be attributed to some specific emitters or specific emitter-scatterer pairs. This analysis was found to be useful to interpret experimental XPED patterns, and is expected to be applied to the analysis of the structures of surfaces or interfaces related to such phenomena as selective desorption or substitution of specific site of atoms.
The Curve Fitting Analysis of D.c. and A.c. Voltammograms of a Two-step Surface-redox Reaction. The Application to the Surface-redox System of Adriamycin Adsorbed on a Pyrolytic Graphite Electrode
Authors: Kano Kenji , Konse Tomonori , Kubota Tanekazu 
Published: July 2006

Abstract
A theoretical study of the two-step surface-redox reaction (Oad+n1e\ightleftharpoonsSad, Sad+n2e\ightleftharpoonsRad) was performed using d.c. voltammetry. A new method based on a non-linear least-squares curve fitting of cyclic d.c. and a.c. voltammograms was proposed for determining electrochemical parameters and was successfully applied to the surface-redox system of the quinone moiety of adriamycin adsorbed on a pyrolytic graphite electrode.
Differential Pulse Polarographic Determination of Lead Using Coprecipitation with Hafnium Hydroxide
Authors: Ueda Joichi , Kita Chikako 
Published: July 2006

Abstract
A differential-pulse polarographic determination of trace amounts of lead using coprecipitation with hafnium hydroxide has been studied. Hafnium hydroxide is effective as a collector of lead and makes 2.5 to at least 1250 μg of lead coprecipitate quantitatively from 100–500 cm3 of sample solution. The formed precipitate is easily dissolved with hydrochloric acid and the presence of hafnium does not affect to the polarogram of lead. The effects of twenty-three diverse ions such as aluminium, zinc, cadmium, chromium(III), manganese(II), cobalt, and nickel were examined, and it was found that the presence of tin(IV), copper, and iron(III) interfered with the determination, even in small amounts. The recommended procedure for the determination is as follows. To a sample solution containing lead, 5 mg of hafnium is added and the pH is adjusted to about 10 with 1 : 1 aqueous ammonia. Then, the precipitate is filtered with a glass filter and dissolved with 2 cm3 of concd hydrochloric acid. After the solution is diluted to 25 cm3 with distilled water and deaerated with pure nitrogen for 5 min, lead is determined by the current peak height at −0.41 V.
Gas Chromatography–Mass Spectrometry of Trimethylsilylated Imino Derivatives of Alanine
Authors: Kawashiro Katsuhiro , Morimoto Shiro , Yoshida Hideyuki 
Published: July 2006

Abstract
Trimethylsilylation of seven imino derivatives of alanine with N,O-bis(trimethylsilyl)trifluoroacetamide in acetonitrile was studied. The imino derivatives include 2,2′-iminodipropionitrile (1), 2,2′-iminodipropionamide (2), 2,2′-iminodipropionic acid (3), 2-(1-cyanoethylamino)propionamide (4), 2-(1-cyanoethylamino)propionic acid (5), 2-(1-carbamoylethylamino)propionic acid (6), and 3,5-dimethyl-2,6-piperazinedione (7). The reaction products were identified by gas chromatography–mass spectrometry. Under the present reaction conditions (at 100 °C for 30 min), hydrogen atoms of carboxyl and carbamoyl groups and an imide hydrogen were readily replaced by the trimethylsilyl (TMS) group, but imino hydrogens were not replaced because of the steric hindrance of N-substituent group. For the carbamoyl group, only one hydrogen was replaced. Consequently, 1 was not trimethylsilylated. Furthermore, no definite trimethylsilylation products were obtained for 4. Upon electron impact at 70 eV, 2, 3, and 5–7 gave rather simple spectra with molecular (M+) and M −15 (loss of CH3) ions characteristic of TMS derivatives. A fragment, M −117 (loss of COOTMS) or M −116 (loss of CONHTMS), was very prominent for 2, 3, 5, and 6. Other important ions such as m/z 70 were noted. Preparations and properties of some of the imino derivatives are also described.
Alkylation and Oxidation of 6,7-Dihydro-6-methyl-5H-dibenzo[b,g][1,5]thiazocine. Selective Oxidation of the Sulfide Moiety by Transannular Participation of the Amino Group
Authors: Ohkata Katsuo , Takee Kohichi , Akiba Kin-ya 
Published: July 2006

Abstract
6,7-Dihydro-6-methyl-5H-dibenzo[b,g][1,5]thiazocine (7) was prepared by cyclization of the corresponding amino alcohol using thionyl chloride in acetonitrile. Methylation of 7 gave N,N-dimethyl derivative (8) as the sole product. Treatment of 7 with various oxidizing reagents, however, afforded the corresponding sulfoxide (9) and/or N-oxide (13), and sulfone (14) depending on the kind of reagent. Oxidation of 7 with sodium periodate furnished N-oxide (13) in 72% yield as a major product along with sulfoxide (9) in 12% yield, while 9 was obtained as a major product (76%) by oxidation with sodium hypochlorite together with a small amount of methoxysulfonium derivative (15) in aqueous methanol. The acceleration in oxidation of 7 compared with diphenyl sulfide as well as production of 15 is ascribed to the transannular participation of the amino group with the chlorosulfonio group or intermediacy of a sulfurane. In addition, structural features of 9 and 15 have been investigated by means of 1H NMR and evidence for the transannular interaction between the two heteroatoms is presented.
Studies of Unusual Amino Acids and Their Peptides. XVII. The Synthesis of Peptides Containing N-Carboxymethyl Amino Acids. II
Authors: Miyazawa Toshifumi , Hiramatsu Shin’ichi , Tsuboi Yasuhiro , Yamada Takashi , Kuwata Shigeru 
Published: July 2006

Abstract
The synthetic routes were investigated to four kinds of tetrapeptides made up of three usual amino acid residues and one N-carboxymethyl (Cm-) amino acid residue. The application of vacuum distillation made the isolation of a Cm-amino acid diester more convenient and efficient compared with the chromatographic methods which had been used previously. The efficiency of peptide bond formation at the imino group of a Cm-amino acid by the acid chloride method was remarkably improved under suitable reaction conditions. In the elongation of the peptide chain from a peptide containing a Cm-amino acid at the C-terminal position, the coupling efficiency was usually poorer than that in the case of the corresponding peptide composed only of the usual amino acid residues, and it depended greatly on the coupling methods, the 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide–1-hydroxybenzotriazole method being generally the most desirable.
Heterogeneous Photocatalytic Decomposition of Phenol over TiO2 Powder
Authors: Okamoto Ken-ichi , Yamamoto Yasunori , Tanaka Hiroki , Tanaka Masashi , Itaya Akira 
Published: July 2006

Abstract
The photocatalytic decomposition of phenol in oxygenated aqueous suspensions of lightly-reduced anatase TiO2, being the most satisfactory among the semiconductors investigated from the standpoint of the photocatalytic activity and stability, has been investigated at the optimum pH 3.5. The products at the initial stage of the reaction were hydroquinone, pyrocatechol, 1,2,4-benzenetriol, pyrogallol, and 2-hydroxy-1,4-benzoquinone. These intermediates underwent further photocatalytic oxidation via acids and/or aldehydes finally into CO2 and H2O. A reaction scheme involving hydroxyl radicals as real reactive species has been proposed. Although H2O2 was formed via O2\ewdot produced by electron trapping of adsorbed oxygen, its concentration remained constant at a low value during the reaction. About 0.7 mole of O2 was consumed for the consumption of one mole of phenol at the initial stage of the reaction. These results indicated that hydroxyl radicals were formed not only via holes but also via H2O2 from O2\ewdot. It was interesting from the viewpoint of wastewater treatment that phenol was completely mineralized to CO2 in the presence of TiO2 powder under solar irradiation without both aeration and mixing of the solution.
Cadmium-photosensitized Reaction of γ-Valerolactone and α-Methyl-γ-butyrolactone
Authors: Yamamoto Shunzo , Takahoso Hiroshi , Sueishi Yoshimi , Nishimura Norio 
Published: July 2006

Abstract
The cadmium-photosensitized reactions of γ-valerolactone and α-methyl-γ-butyrolactone have been investigated. The obtained products in both cases were carbon monoxide, ethylene, propylene, acetaldehyde, and 2-methyloxetane. The dependence of the yields of ethylene and propylene on the total pressure suggests the existence of a biradical and an energized intermediate. Possible mechanisms are discussed.
Adsorption Equilibria of Copper on Octadecylsilica Gel in the Presence of Acetylacetone
Authors: Kato Masanao 
Published: July 2006

Abstract
The solid-liquid adsorption equilibria of copper with acetylacetone between octadecyl-bonded silica (ODS) gel and aqueous solution were investigated by a batch method at 298±1 K. It is found that a 1 : 1 complex of copper with acetylacetone is adsorbed on the gel surface.
A Method for Preparing A Large Sized, Uniform and Stable Built-up Film of 109Cd Icosanoate as A Radioactive Source by Utilization of an Extremely Small Amount of Substrate Solution
Authors: Iwahashi Makio , Naito Fujio , Watanabe Norifumi , Seimiya Tsutomu , Morikawa Naotake , Nogawa Norio , Ohshima Takayoshi , Kawakami Hirokane , Ukai Kumataro , Sugai Isao , Shibata Seiichi , Yasuda Takahiro , Shoji Yoshihiko , Suzuki Takeshi , Nagafuchi Teruyasu , Taketani Hiroshi , Matsuda Takeshi , Fukushima Yasutaka , Fujioka Manabu , Hisatake Kazuo 
Published: July 2006

Abstract
A stable radioactive source in vacuo was obtained by a modified horizontal lifting method of Langmuir-Blodgett (L/B) film. In spite of the slight consumption of the substrate solution (only 2–2.5 ml) for preparing a 15 mm×25 mm sized L/B film containing four molecular layers of 109Cd icosanoate, the deposition of the film was complete. The reliability of the deposited films by this method was confirmed by their radioactivities, deposition ratios and autoradiographs. The condition to obtain a larger sized homogeneous L/B film (20–25 mm×102 mm) was also examined. Two or four molecular layers of nonradioactive Cd icosanote deposited on the L/B film of 109Cd icosanoate did not influence the intensity of the γ-ray of 88.0 KeV. Concequently, it is possible to obtain the high radioactive source by the deposition of the multilayers of 109Cd icosanoate. Spectra of L2 and L3 conversion electrons from the 109Cd in its built-up film were also determined. In conclusion, the present depositing method for the L/B film is excellent for the manufacturing the radioactive source and thought to be also applicable for the deposition of other valuable materials.
Studies on the Electronic Absorption Spectra of 2,2′-Bithienyl and Some of Its Derivatives. A Molecular Orbital Treatment
Authors: Abu-Eittah Rafie H , Al-Sugeir Fakhreia A 
Published: July 2006

Abstract
The electronic absorption spectra of 2,2′-bithienyl and a number of its derivatives have been investigated. The predominant conformer as well as the polarity of the molecule were predicted from the spectrum. Molecular orbital calculations were performed on different conformers of 5-formyl-2,2′-bithienyl and the s-trans geometry proved to be the predominant conformer of the molecule. A good agreement is observed between calculated and observed transition energy and intensity.
Cobalt-catalyzed Hydroesterification of Formaldehyde Dialkyl Acetals
Authors: Murata Kazuhisa , Matsuda Akio , Masuda Takashi 
Published: July 2006

Abstract
Co2(CO)8-organic amine system was found to be an effective catalyst for the production of alkoxyacetic ester from formaldehyde dialkyl acetals and CO; this is the first example of homogeneous hydroesterification of acetal.
A Correlation of Electrochemical Oxidation and Ionization Potentials of Group 4B Dimetals
Authors: Mochida Kunio , Itani Atsuko , Yokoyama Michiyo , Tsuchiya Tohru , Worley Shelby D , Kochi Jay K 
Published: July 2006

Abstract
Correlations of ionization potentials and electrochemical oxidation potentials for group 4B dimetals were obtained.
Preparation of Vanadium–Phosphorus Mixed Oxide (P/V=1) Catalysts and Their Application to Oxidation of Butane to Maleic Anhydride
Authors: Shimoda Tomoaki , Okuhara Toshio , Misono Makoto 
Published: July 2006

Abstract
Several vanadium–phosphorus mixed oxides with a P/V ratio=1 have been prepared and the relationships between the structure of catalyst and the catalytic function for the selective oxidation of butane to maleic anhydride were examined. As revealed from XRD, IR, XPS, and redox titration studies, five among them were presumably composed of crystalline single phases, that is, α-VOPO4, β-VOPO4, and (VO)2P2O7 as well as unknown phases X1 and X2. The valences of the vanadium of these catalysts were close to five, except for (VO)2P2O7 (the valence was four). These phases were prepared, respectively, by controlling the kind of precursors and the calcination conditions. The selectivity to maleic anhydride differed markedly among these catalysts, although the rate did not change much when it was normalized to surface area. The selectivity at 440 °C was less than 20% for α- and β-VOPO4, 40% for X1 and X2, and 70% for (VO)2P2O7. Amorphous phases having V4+ were much less selective than (VO)2P2O7. No structural changes of the catalysts after use were observed in the cases of α-, β-VOPO4, and (VO)2P2O7. Therefore, the effective phase for selective oxidation of butane to maleic anhydride was speculated to be a phase like (VO)2P2O7 in which the valence of vanadium is four and the structure is stable under the reaction conditions.
Preparation of Polyoxa-1,n-dithia[n](1,1′)ruthenocenophanes and the Structural Studies of Their Metal Complexes
Authors: Akabori Sadatoshi , Munegumi Hiroyuki , Habata Yoichi , Sato Sadao , Kawazoe Kayoko , Tamura Chihiro , Sato Masaru 
Published: July 2006

Abstract
Polyoxa-1,n-dithia[n](1,1′)ruthenocenophanes were prepared by treatment of 1,1′-ruthenocenedithiol with α, ω-dibromo polyethers. The ruthenocenophanes formed efficiently complexes with soft ions, but not with hard and borderline cations. The 1H- and 13C-NMR spectral data of the silver(I) ion-complexed ruthenocenophanes suggested a partial electron-transfer interaction between the ruthenium atom of the ruthenocene nucleus and the incapsulated silver(I) ion. The crystal structure of the 1:1 complex of 4,7,10,13-tetraoxa-1,16-dithia[16](1,1′)ruthenocenophane with mercury(II) chloride was determined by the X-ray method. The crystals are triclinic, space group P\bar1, with a=13.722(3), b=11.678(4), c=8.179(2) Å, α=102.69(3), β=72.82(2), γ=100.73(2)°, Z=2, Dx=2.11 g cm−3. The mercury(II) cation and the two chloride ions are situated in the central cavity of the macrocyclic moiety and at the apexes, respectively. The distance between the ruthenium atom of a ruthenocene nucleus and the incapsulated mercury(II) ion is 4.846 (2) Å which is too long for direct metal–metal interaction.
Development and Application of Organic Reagents for Analysis. VI. Synthesis and Fluorescence Spectral Properties of 2-(4-Substituted phenyl)benzofurans
Authors: Akiyama Shuzo , Akimoto Hiroyuki , Nakatsuji Shin’ichi , Nakashima Kenichiro 
Published: July 2006

Abstract
A synthesis of fifteen kinds of 2-(4-substituted phenyl)benzofurans (4n) was carried out and their fluorescence spectral properties were investigated concerning their applicability as organic reagents for analyses.
Molecular Complexes of Hydroxy Host Systems with Alcohols. X-Ray Crystal Structures of 1,1,6,6-Tetrakis(2,4-dimethylphenyl)-2,4-hexadiyne-1,6-diol–Ethanol (1:2), 1,1-Bis(2,4-dimethylphenyl)-2-butyn-1-ol–Ethanol (1:1), and 9-(1-Propynyl)-9-fluorenol–Methanol (1:1)
Authors: Toda Fumio , Tanaka Koichi , Mak Thomas C W 
Published: July 2006

Abstract
The structures of a 1:2 molecular complex(I) of 1,1,6,6-tetrakis(2,4-dimethylphenyl)-2,4-hexadiyne-1,6-diol with ethanol, a 1:1 complex(II) of 1,1-bis(2,4-dimethylphenyl)-2-butyn-1-ol with ethanol, and a 1:1 complex(III) of 9-hydroxy-9-(1-propynyl)fluorene with methanol have been determined by X-ray crystallography. The crystal data are: I, C42H50O4, P\bar1, a=8.249(3), b=9.522(5), c=14.803(8)Å, α=100.95(4), β=110.82(4), γ=113.08(3)°, Z=1, and Rf=0.105 for 1834 observed Mo Kα data; II, C22H28O2, P\bar1, a=8.142(2), b=11.281(3), c=l2.262(4)Å, α=102.76(2), β=97.08(2), γ=111.19(2)°, Z=2, and Rf=0.073 for 2104 data; III, C17H16O2, P21/a, a=8.641(5), b=10.883(5), c=30.63(2)Å, β=92.88(4)°, Z=8, Rf=0.154 for 1885 data. The crystal structures of I and II are closely related and both feature planar hydrogen-bonded (OH)4 rings centered at centrosymmetric sites. In III, the fluorene and methanol molecules belong to two independent sets, and the molecular components in each set are alternately linked by hydrogen bonds to form infinite zigzag chains parallel to the a axis.
The Crystal and Molecular Structures of Esculetin 6-Glucoside and 7-Glucoside
Authors: Ueno Katsuhiko , Shiraki Masaru , Sato Mitsuhiko , Saito Norio 
Published: July 2006

Abstract
The structures of two dihydroxycoumarin glucosides, esculetin 6-glucoside (E6G) and escultin 7-glucoside (E7G) have been determined by the X-ray analysis. The crystal data are: E6G, C15H16O9·1.5H2O, orthorhombic P212121 with a=11.358(2), b=36.850(9), c=7.663(1) Å and Z=8: and E7G, C15H16O9·2H2O, orthorhombic P212121 with a=4.507(1), b=13.077(3), c=27.748(5) Å and Z=4. Both structures were solved by the direct method and refined by the least-squares to the final R values of 0.073 (2036 reflections) for E6G and 0.069 (1037 reflections) for E7G. The geometries of the glucosyl linkages in E6G and E7G are different: the torsion angles around the glucosidic C–O bond are −58.2° and 14.3° for the two crystallographically independent E6G molecules and 9.9° for E7G. The glucosidation at the 6-hydroxyl group causes little effect on the conjugation of the coumarin moiety, whereas the conjugation is greatly decreased in the glucosidation at 7-hydroxyl group. This fact suggests that E6G is energetically more stable than E7G. The enzymatic transglucosidation from 7- to 6-hydroxyl group may proceed utilizing such an energy difference.
The Crystal and Molecular Structure of syn-[2.2](1,4)Anthracenophane and Its Photoisomer
Authors: Toyoda Toshihiro , Kasai Nobutami , Misumi Soichi 
Published: July 2006

Abstract
Molecular structure of syn-[2.2](1,4)anthracenophane (1) and its photoisomer (2) have been determined by means of X-ray diffraction; 1, monoclinic, space group A2, a=25.539(2), b=8.152(1), c=20.561(3) Å, β=106.03(1)° (−149°C), Z=8; 2, monoclinic, space group P21/c, a=8.065(6), b=12.963(9), c=19.580(5) Å, β=91.46(5)°, Z=4. The structure of 1 was solved by the vector search method and 2 by the direct method. Both structures were refined including all hydrogen atoms by the block-diagonal least-squares procedure: R=0.053 and 0.043 for 4413 and 2003 observed reflections for 1 and 2, respectively. Two anthracene nuclei, connected by ethylene bridges at the 1 and 4 positions, in each of the two independent molecules (A and B) of 1 are approximately parallel. However, their overlappings differ slightly. In the photoisomer 2 the two anthracene nuclei are bound by newly formed bonds at the 9 and 10 positions: bond distances are 1.628(5) and 1.637(5) Å whereas the corresponding nonbonded distance in 1 are 3.312(6) and 3.301(6) Å (A molecule) and 3.357(6) and 3.366(6) Å (B molecule).
Fischer Tropsch Reaction over Reduced Molybdenum Catalysts Derived from Various Heteropoly Compounds
Authors: Miura Hiroshi , Ishiguro Hitoshi , Osawa Masashi , Sasagawa Kazunori , Sugiyama Kazuo , Matsuda Tsuneo 
Published: July 2006

Abstract
The Fischer-Tropsch reaction was examined over reduced molybdenum catalysts using heteropoly compounds as catalyst precursors. Improvement in reducibility was realized by the use of heteropoly compounds. Metallic molybdenum powder with a very large surface area was obtained by the reduction of H3PMo12O40. Its catalytaic activity was one order higher than conventional Mo catalysts. Using different salts of 12-molybdophosphoric acid, various additives were introduced under equivalent conditions and their addition effects were studied.
Electrochemical Epoxidation and Carbon–Carbon Bond Cleavage for the Preparation of 3-Methyl-4-oxo-2-phenyl-4H-1-benzopyran-8-carboxylie Acid from 3-Methyl-2-phenyl-8-(1-propenyl)-4H-1-benzopyran-4-one
Authors: Uneyama Kenji , Masatsugu Yosinori , Torii Sigeru 
Published: July 2006

Abstract
Electrooxidative carbon–carbon bond cleavage is useful for the preparation of 3-methyl-4-oxo-2-phenyl-4H-1-benzopyran-8-carboxylic acid (1b) from 3-methyl-2-phenyl-8-(1-propenyl)-4H-1-benzopyran-4-one (2). Olefin 2 was transformed into 3-methyl-8-(1,2-epoxypropyl)-3-methyl-2-phenyl-4H-1-benzopyran-4-one (3) by the electrochemical bromohydrination in an MeCN–H2O–H2SO4–NaBr–(Pt) system followed by treatment of aqueous sodium hydroxide (94%). The epoxide 3 was electrooxidized in an MeOH–H2SO4–(C) system, affording 8-formyl-3-methyl-2-phenyl-4H-1-benzopyran-4-one (4) in 83% yield. Hydrogen peroxide oxidation of 4 in refluxing 2-butanone gave 1b in 86% yield.
Stability and Distribution Studies on Semicrystalline Tin(IV) Selenophosphate. Separation of Metal Ions
Authors: Nabi Syed Ashfaq , Siddiqi Zia Mahmood , Rao Rifaqat A K 
Published: July 2006

Abstract
Tin(IV) selenophosphate has been synthesized by mixing 0.05 mol dm−3 aqueous solutions of tin(IV) chloride, sodium selenite and sodium dihydrogenphosphate in 1:1:2 ratio at pH=0. The chemical and thermal stabilities are investigated. A tentative formula has been proposed for tin(IV) selenophosphate on the basis of chemical composition, pH titration, IR spectrum and thermogravimetric anslysis. The distribution coefficients of metal ions have been determined in DMF, DMSO, DMF–HNO3, and DMSO–HNO3 media. A number of binary, ternary, and quaternary separations of metal ions have been achieved on the columns of tin(IV) selenophosphate.