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本文用分光光度法测定了25℃时配阳离子Cu(SCN)~+在乙醇一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NANO_3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.
In this paper, the stability constant of Cu (SCN) ~ + in ethanol-water medium at 25 ℃ was determined by spectrophotometry. The weight percentage of ethanol in the mixed solvent was 0, 5, 10, 15, 20 and 25. NANO_3 adjust the ionic strength of the solution I = 0.2-2.0mol · dm -3 .The experimental pH = 1.5-1.6.This paper presents a curve fitting method based on Pitzer equation to determine the thermodynamic stability constants of the complex in the mixed solvent. The relationship between the constant and the first-order medium effect and the solution composition and the dielectric constant is shown.