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Citation: Zhang Hui, Yan Wen-Bin, Zhou Zhao-Hui, Xu Zhi-Gu. Kinetic Investigation on the Mechanism of the Reduction of Imidazole Cobalt(III) Complexes[J]. Acta Physico-Chimica Sinica, ;1995, 11(12): 1093-1096. doi: 10.3866/PKU.WHXB19951207 shu

Kinetic Investigation on the Mechanism of the Reduction of Imidazole Cobalt(III) Complexes

1.
Department of Chemistry,Xiamen University,Xiamen 361005

Received Date: 19 September 1994
Available Online: 15 December 1995

Kinetic studies on the electron transfer(ET) reaction of [Co(NH3)5(ImH)]3+/[Fe(CN)6]4- and trans-[Co(NH3)(en)2(ImH)]3+/[Fe(CN)6]4- have been carried out at various temperatures. The results indicated that these two ET reactions followed the outer sphere mechanism. At 25℃,I=0.50mol L-1, the ion pair formation constants Qip of the precursor complexes in the ET reactions are 2.6×102 and 4.9 × 102mol L-1 ,and the electron transfer rate constants kct are 2.1 ×10-4 and 5.2 ×10-5s-1 respectively. The activation enthalpy △Het≠ and the activation entropy △Set≠ of these two processes are 1.2×102, 0.8×102kJ/mol and 5.1×102, 3.6×102kJ/mol﹒K-1 respectively.
- Electron transfer reaction,
- Outer sphere mechanism,
- Imidazole complex,
- Co(III) complex
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