Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (11): 1235-1239.doi: 10.3866/PKU.WHXB20051108

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Diffusion Coefficients and Rate Constants of NiCl2(bpy)3 in DMF Determined by Chronocoulometry

ZHAO Peng; FANG Hui-jue; XUE Teng; QI Xi-min; LU Jia-xing   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Process, Department of Chemistry, East China Normal University, Shanghai 200062
  • Received:2005-03-24 Revised:2005-05-20 Published:2005-11-15
  • Contact: LU; Jia-xing E-mail:jxlu@chem.ecnu.edu.cn

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Abstract: The electrochemical characteristic of NiCl2(bpy)3 at glassy carbon electrode in DMF has been investigated by using cyclic voltammetry. Chronocoulometry was employed to determine the diffusion coefficients and the rate constants (kf and k0). The CV results imply that the redox reaction of NiCl2(bpy)3 at glassy carbon electrode is quasi-reversible. The diffusion coefficient increased with the increase of temperature between 302.15 K and 334.15 K. The forward rate constants (kf) at different potentials and standard rate constants (k0) at different temperatures were also obtained by analysis of charge-time data. According to the slope of lnk0 against T-1, the activation energy (Ea) of the electron transfer was 14.4 kJ•mol-1.

Key words: Nickel complex, Chronocoulometry, Rate constant, Diffusion coefficient, Activation energy