NOPR Collection:

Indirect polarographic determination of yttrium

Tue, 01 Aug 2000 00:00:00 GMT

Title: Indirect polarographic determination of yttrium Authors: Sawant, Shilpa D; Chitre, Rayindra S; Sundaresan, R; Mathur, P K Abstract: A polarographic method of determining yttrium is described. The method is based on the changes in the polarographic behaviour of the o-hydroxyazo dye, Arsenazo- I, in presence of yttrium. It is demonstrated that the method could be applied for determination of yttrium in the superconducting oxide YBa₂CU₃O_y(y=6.5-7.0). Page(s): 886-888

Synthesis and characterization of toluene- 3,4-dithiolatoantimony(III) diorganodithiophosphates

Tue, 01 Aug 2000 00:00:00 GMT

Title: Synthesis and characterization of toluene- 3,4-dithiolatoantimony(III) diorganodithiophosphates Authors: Chauhan, H P S; Porwal, Beena; Singh, R K Abstract: Displacement reactions of toluene-3,4-dithiolatoantimony(III) chloride with sodium diorganodithiophosphates in 1:1 molar ratios in anhydrous benzene yield mixed toluene-3,4- dithiolatoantimony(III) diorganodithiophosphates of the type SC₆H₃(CH₃)SSbS₂P(OR)₂ (where R = Prⁿ, Prⁱ, Buⁿ and Buⁱ). These derivatives have been characterised by elemental analysis (C, H, Sb and S), as well as IR , NMR (¹H and ³¹P) spectral studies. Page(s): 880-882

The redox behaviour of CuO-ZrO₂ CeO₂Mixed oxides catalysts

Tue, 01 Aug 2000 00:00:00 GMT

Title: The redox behaviour of CuO-ZrO₂ CeO₂Mixed oxides catalysts Authors: Wang, En-Guo; Chen, Song-Ying Abstract: The redox behavior or CuO-ZrO₂ CeO₂ mixed oxide catalysts has been studied. It is round that the composition of the mixed oxides and thermal treatment could affect the reducibility of the samples, and that reduced CuO-ZrO₂ CeO₂ mixed oxides are oxidized easily. The experimental results also show that there is strong interaction between CuO and CeO₂ - ZrO₂mixed oxide, and that the interaction promotes both the reduction of CuO and CeO₂) in mixed oxides as well as the catalytic activity for CO oxidation. Page(s): 851-855

Correlation of distribution of organic solutes in organic solvent - water systems with molecular properties and solution structure parameters

Tue, 01 Aug 2000 00:00:00 GMT

Title: Correlation of distribution of organic solutes in organic solvent - water systems with molecular properties and solution structure parameters Authors: Prezhdo, V V; Melnik, I I; Jagiello, M; Zubkova, V V; Prezhdo, M V; Bezak-Mazur, E Abstract: A systematic analysis of experimental data on extraction of organic solutes with organic solvents indicates that non-specific intermolecular interactions are better described by pairwise interaction potentials of London- Debye-Keesom than by the Hilderbrand solubility parameter. The results point to significant and universal importance of dispersive, inductive and dipole-dipole interactions between solute and solvent molecules. Deviations in the experimental values for the distribution constants from the corresponding theoretical values, calculated under the assumption that the extracted substance and the extractant form no complexes, allow for estimation of the energy of specific intermolecular interactions. A method, which permits identification of the contributions of non-specific and specific intermolecular interactions between extractant and extracted molecules to the distribution constant, is suggested. Page(s): 802-808

NOPR Collection:

Indirect polarographic determination of yttrium

Synthesis and characterization of toluene- 3,4-dithiolatoantimony(III) diorganodithiophosphates

The redox behaviour of CuO-ZrO2 CeO2 Mixed oxides catalysts

Correlation of distribution of organic solutes in organic solvent - water systems with molecular properties and solution structure parameters

The redox behaviour of CuO-ZrO₂ CeO₂Mixed oxides catalysts