钍试剂Ⅱ及铍(Ⅱ)-钍试剂Ⅱ的电化学行为的研究——Ⅱ.钍试剂Ⅱ的解离作用,电化学行为及其电极反应机理

Studies on the Electrochemical Behaviour of Thoron Ⅱ and Beryllium(Ⅱ)-Thoron Ⅱ Complex Ⅱ.The Investigation of Dissociation,Electrochemical Properties of Thoron Ⅱ and the Mechanism of Its Electrode Reaction

本文用电位法及分光光度法分别求得钍试剂Ⅱ(H_(10)R)的pK_5到pK_(10)和pK_3到pK_(10)各级解离常数,两法所得结果基本一致。并确定了于pH为9.5时试剂和其铍(Ⅱ)配合物存在的主要形态。试验表明,它们分别在-0.58V和-0.70V(对SCE)所产生的峰电流,为具吸附特性的不可逆电极过程。测得电子转移数(n)、电子转移系数(a)及在电极表面的饱和吸附量(Гs),并对电极反应机理作了探讨。

The fifth to the tenth order dissociation constants of thoron Ⅱ (H_(10)R) were calculated by using potentiometry and spectrophotometry. The main form of thoron Ⅱ and its complex with beryllium (Ⅱ) in solution(pH 9. 5) has been confirmed. The electrode reaction of thoron Ⅱ was an irreversible process with adsorption of its oxidation form. The number of electrons(n) involved in the electrode reaction of thoron Ⅱ , the electron transfer coefficient (a) and the amounts of saturated adsorption (г_s) have been calculated. The mechanism of their electrode reaction was presented.