THERMODYNAMICS OF TRANSFER OF BENZOIC-ACID FROM WATER TO AQUEOUS MIXTURES OF UREA AND OF SOME ALCOHOLS

被引：41

作者：

DAS, K ^{[1
]}

DAS, AK ^{[1
]}

BOSE, K ^{[1
]}

KUNDU, KK ^{[1
]}

机构：

[1] JADAVPUR UNIV,PHYS CHEM LABS,CALCUTTA 700032,INDIA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1978年 / 82卷 / 11期

关键词：

D O I：

10.1021/j100500a010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Free energies (ΔG°t) and entropies (ΔS°t) of transfer of benzoic acid (HBz) from water to aqueous mixtures of urea as well as of some alcohols have been determined from solubility measurements at different temperatures. Trends in the observed ΔG°t-composition profiles in aquo-alcoholic solvents have been ascribed chiefly to dispersion interactions between the phenyl group of the acid and the hydrocarbon moieties of the alcohols, and those in urea-water mixtures to the pronounced hydrogen bonding of the COOH group of the acid with the zwitterionic form of urea. The observed pronounced maxima in ΔS°t-composition profiles in alcoholic solvents have been shown to result chiefly from the effects of enhancement of water structure induced by the hydrocarbon moieties of alcohols. The nearly invariant TΔS°t values in urea-water mixtures are believed to arise from the relatively much smaller effects of urea on the structure of water. © 1978 American Chemical Society.

引用

页码：1242 / 1245

页数：4

共 33 条

[1]

BATES RG, 1968, HYDROGEN BONDED SOLV, P49

[2] FREE-ENERGIES AND ENTROPIES OF TRANSFER OF HYDROBROMIC AND HYDROIODIC ACIDS FROM WATER TO T-BUTYL ALCOHOL + WATER MIXTURES FROM ELECTROMOTIVE-FORCE MEASUREMENTS AT DIFFERENT TEMPERATURES (5-35 DEGREESC) [J].