Partial molar compressibilities of halogeno complexes of platinum and palladium in aqueous solutions at 25 degrees C

被引:0
作者
Kawaizumi, F
Amakasu, Y
Nomura, H
机构
[1] School of Engineering, Nagoya University, Nagoya-shi, 464-01, Chikusa-ku
关键词
partial molar compressibility; halogeno complexes of platinum and palladium; solute-solvent interaction;
D O I
10.1007/BF02767921
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
Ultrasonic propagation velocities were measured at 25 degrees C for dilute aqueous solutions of K-2[PtX4], K-2[PtX6], K-2[PdX4], and K-2[PdX6] (X = Cl, Br, or SCN). The data obtained were combined with our previous density data to calculate the adiabatic compressibilities of each solution. Then, the infinite dilution values of partial molar adiabatic compressibilities K-s(o) were evaluated. By subtraction of the K-S(o) (K+) from those of the complexes, the values of K-S(o) for the halogeno complex ions [PtX4](2-), [PtX6](2-), [PdX4](2-) and [PdX6](2-) were determined. The values for the thiocyano complex ions [Pt(SCN)(4)](2-) and [Pt(SCN)(6)](2-) are positive, showing that the interaction of the ligand SCN- with the solvent water is very weak. Although the V-2(o) behavior of the complex ions [PtCl6](2-) and [PdCl6](2-) differed only slightly, compressibility measurement has indicated that the ion [PdCl6](2-) interacts more strongly than [PtCl6](2-).
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页码:199 / 205
页数:7