ENTHALPY OF SOLUTION OF TRIS(2,4-PENTANEDIONATO)COBALT(III) IN AQUEOUS MIXED-SOLVENTS OF 1,4-DIOXANE AND 2-METHYL-2-PROPANOL

被引：5

作者：

YOSHIMURA, Y

机构：

[1] Laboratory of Chemistry, College of Humanities and Social Sciences, Iwate University, Ueda Morioka,020, Japan

来源：

CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE | 1987年 / 65卷 / 06期

关键词：

Solubility - Cobalt compounds - Enthalpy;

D O I：

10.1139/v87-205

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The solubilities X5 of tris(24-pentanedionato)cobalt(III) (Co(acac)3) in water - 1 4-dioxane (D) and water - 2-methyl-2- propanol (TBA) mixtures were determined over the temperature range of 15-60°C and 20-43°C respectively. These data were fitted to ln X A(l/T) + BT + C and the enthalpy of solution of Co(acac)3 was estimated by-differentiating the equation. For the water-D system a linear correlation was found between the excess enthalpy of solution iH of Co(acac)3 and the excess internal pressure P1 of the mixtures. IH of Co(acac)3 in the water-TBA mixtures showed complicated composition dependence due to microheterogeneity in the mixtures. The enthalpy of hydrophobic hydration Hh of Co(acac)3 in the water-D mixtures was also estimated from the solubility curves and it was found that liHh decreased exponentially with decreasing mole fraction of water.

引用

页码：1218 / 1223

页数：6

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