介质对配合物稳定性的影响 Ⅳ.Cu(SCN)^+-NaNO_3-tert-Butyl Alcohol-H_2O体系,25℃

INFLUENCE OF MEDIUM ON STABILITY OF COORDINATION COMPOUNDS Ⅳ.SYSTEM OF Cu(SCN) + NaNO 3 tert Butyl Alcohol H 2O AT 25℃

本文用分光光度法确定了２５℃下配阳离子Ｃｕ（ＳＣＮ）＋在ＮａＮＯ３－叔丁醇－水介质中的稳定常数。混合溶剂中叔丁醇组成为０，５，１０，１５，２０和２５ｗｔ％，离子强度范围为０．２～３．０ｍｏｌｅ·ｄｍ－３，溶液的ｐＨ＝１．５～１．６。基于Ｐｉｔｚｅｒ理论用最小二乘多项式逼近法，确定了混合溶剂中配合物热力学稳定常数。讨论了配位反应的一级介质效应。

The stability constants of Cu(SCN) + ion in the NaNO 3 tert Butyl alcohol H 2O medium have been determined by spectrophotometric measurements at 25℃ for 0, 5, 10, 15, 20 and 25 wt% to tert butyl alcohol in mixed solvent. The total ionic strengths of the solution are 0.2￣3.0 mole·dm -3 , and pH=1.5￣1.6. On the basis of Pitzer′s theory, a method of determining thermodynamic stability constants of coordination compounds in mixed solvents by polynomial approximation has been proposed. The primary medium effect of coordination reaction have been discussed.