【摘要】 本文用分光光度法确定了25℃时配阳离子Cu（SCN）⁺在NaNO₃—二氧六环—H₂O介质中的稳定常数。溶剂组成变化范围为0,5,10,15和20wt％二氧六环,离子强度范围为0.2～3.0moledm^-3,溶液的pH=1.5～1.6。本文提出了基于Pitzer方程式的最小二乘多项式逼近法,确定出各种不同组成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剂组成和介电常数的关系。更多还原

【Abstract】 The stability constants of Cu(SCN)+ ion in the Cu(SCN)+-NaNO3-dioxane-H2O system have been determined by spectrophotometric measurements at 25℃ for 0, 5, 10, 15 and 20 wt% for dioxane in mixed solvents. 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. Finally, the stability constants of Cu(SCN)+ ion in mixed solvents were correlated with composition or dielectric constants of mixed solvents.更多还原