用分光光度法研究[Fe(H_2O)_3(NCS)_3](18-C-6)在微栅电极上的电化学性质

STUDIES ON THE ELECTROCHEMICAL BEHAVIORS OF [Fe(H_2O)_3(NCS)_3] (18-C-6) ON MINIGRID ELECTRODE BY SPECTROPHOTOMETRY

光谱电化学是六十年代才发展起来的一种把光谱技术和电化学方法结合利用的方法.通常以电化学为激励信号,而体系对激发信号的响应则以光谱技术进行监测,两者各自发挥了优点,多种信息可同时现场获得.因此光谱电化学引起了电化学工作者的重视.本文用薄层光谱电化学技术测定了冠醚配合物[Fe(H_2O)_3(NCS)_3](18-C-6)在二甲基甲酰胺(DMF),二甲基亚砜(DMSO)和乙腈中的E°′电子转移数n,扩散系数D_0,异相电子传递速率常数k_S^0′和传递系数α.

The electrochemical reduction processes of [Fe(H_2O)_3(NCS)_3] (18-C-6) havebeen studied in nonaqueous media by method of cyclic voltammetry and spectroelec-trochemistry at an optical transparent thin layer electrode. The formal potential, E°′,electron transfer number, n, diffusion cofficient, D_O, formal heterogeneous electrontransfer rate constant, k_S′, and electrochemical transfer coefficient, a, are deter-minated. Significant effect of solvents on the electrochemical behaviors has beenobserved. The higher the β, the higher the thermodynamic and kinetic stabilities ofthe coordination compound resulted.