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化学学报
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化学学报 ›› 1987, Vol. 45 ›› Issue (8): 760-765. 上一篇    下一篇

研究论文

介质对配合物稳定性的影响I.Cu(SCN)^+-NaNO3-C2H5OH-H2O体系

梁春馀;杨家振;刘祁涛;杨晓秋   

  1. 辽宁大学化学系
  • 发布日期:1987-08-15

The influence of medium on stability of coordination compounds I.The system Cu(SCN)[+]-NaNO3-C2H5OH-H2O

LIANG CHUNYU;YANG JIAZHEN;LIU QITAO;YANG XIAOQIU   

  • Published:1987-08-15

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836

被引次数

2

本文用分光光度法测定了25℃时配阳离子Cu(SCN)^+在乙醇-水介质中的稳定常数.乙醇在混合溶剂中的重量百分数为0,5,10,15,20和25.用NaNO3调节溶液离子强度I=0.2--2.0mol.dm^-^3.实验的pH=1.5--1.6.本文提出了基于Pitzer方程式的曲线拟合法,确定混合溶剂中配合物的热力学稳定常数.讨论了该常数和一级介质效应与溶液组成和介电常数的关系.

关键词: 乙醇, 水, 活性系数, 介质, 稳定常数, 硫氰酸盐, 铜络合物, 电解质, 四元系, 硝酸钠

The stability constants of Cu(SCN)+ in the Cu(SCN)+-NaNO3-C2H5OH-H2O system were determine by spectrophotometric measurements at 25?for 0, 5, 10, 15, 20 and 25 wt.% alcohol in mixed solvents. The total ionic strength of the solution is 0.2-2.0 mol.dm-3, and pH = 1.5-1.6. On the basis of Pitzer's theory, a method of determing thermodn. stability constants of coordination compounds in mixed solvents by curve fitting technique is proposed. The stability constants of Cu(SCN)+ in mixed solvents are correlated with composition and dielec. constant of the solvent mixture

Key words: ETHANOL, WATER, ACTIVITY COEFFICIENT, MEDIA, STABILITY CONSTANT, THIOCYANATE, COPPER COMPLEX, ELECTROLYTE, QUATERNARY SYSTEM, SODIUM NITRATE

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