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The proton ligand stability constants of methyl salicylate, ethyl salicylate and phenyl salicylate and the stepwise stability constants of manganese(II) complexes with these have been determined potentiometrically in aqueous ethanol system 50/50 (v/v) at 25°C at different ionic strengths, viz. 0.050 M, 0.075 M, 0.100 M and at 35 and 45°C at an ionic strength of 0.05 M. The thermodynamic stability constants of the complexes have been evaluated from the various values by extrapolating to zero ionic strength at 25°C. The thermodynamic parameters such as free energy changes (ΔG), enthalpy changes (ΔH) and entropy changes (ΔS) involved have been calculated. 相似文献
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Y. Cui F. Zheng J. Chen J. Huang 《Acta Crystallographica. Section C, Structural Chemistry》1999,55(6):IUC9900065-IUC9900065
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Ralf Weisbarth Martin Jansen 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(3):o189-o190
Tetrakis(chloromethyl)phosphonium chloride monohydrate, C4H8Cl4P+·Cl?·H2O or P(CH2Cl)4+·Cl?·H2O, is the first crystal structure determination of a tetrakis(halogenomethyl)phosphonium compound to date. The only comparable structures known so far are of phosphonium ions containing just one halogenomethyl group. The solvent water molecule interacts with the Cl? anion via hydrogen bonds, with O?Cl distances of 3.230 (2) and 3.309 (2) Å. The structure also contains several C—H?Cl? and C—H?O contacts, though with longer D?A distances [D?A 3.286 (3)–3.662 (2) Å] or bent D—H?A angles. For these reasons, the C—H?Cl? and C—H?O interactions should not be considered as strong hydrogen bonds. 相似文献
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