Group contributions to the partial molar volume of ionic organic solutes in aqueous solution

被引:77
作者
Gianni, P [1 ]
Lepori, L [1 ]
机构
[1] CNR,IST CHIM QUANTIST & ENERGET MOLEC,I-56126 PISA,ITALY
关键词
partial molar volume; organic ions; electrolytes; water; dilute aqueous solutions; group contributions; additivity; intramolecular group interactions; VISCOSITY B-COEFFICIENTS; HEAT-CAPACITIES; THERMODYNAMIC PROPERTIES; AMINO-ACIDS; MICELLAR PROPERTIES; PEPTIDE SOLUTIONS; SODIUM DECANOATE; ADIABATIC COMPRESSIBILITY; THERMOCHEMICAL PROPERTIES; BENZENE-DERIVATIVES;
D O I
10.1007/BF00972756
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
Partial molar volumes at infintie dilution (V) over bar degrees in water at 25 degrees C for more than 400 organic electrolytes (carboxylic acid and amine salts, sulfates, sulfonates, selected polyelectrolytes, aminoacids and derivatives) are described through a simple additivity scheme already adopted for non-electrolytes. Twenty-five charged groups are assigned a (V) over bar degrees contribution and the partial molar volumes of more than 150 monofunctional organic ions ale reproduced with a standard deviation of 0.8 cm(3)-mol(-1). The different volumetric behavior of hydrophobic and hydrophilic centers, either charged or uncharged, is discussed. Deviations from additivity for mono- and polyfunctional ions are analyzed in terms of (i) extension of the hydration cosphere of different polar centres; (ii) intramolecular interactions and their dependence on the nature, number and mutual separation of interacting groups.
引用
收藏
页码:1 / 42
页数:42
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