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Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (1): 133.

• Articles • Previous Articles     Next Articles

Kinetic Investigation of the Ruduction for Crowded[Co(tmen)3]3+by[Fe(CN)6]4-

YAN Wen-Bin, ZHOU Zhao-Hui, ZHANG Hui, TANG Xing-Yuan, XU Zhi-Gu   

  1. Department of Chemistry、Xiamen University, Xiamen, 361005
  • Received:1994-02-19 Revised:1994-05-29 Online:1995-01-24 Published:1995-01-24

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Abstract: Kinetic studies of the outer-sphere electron transfer reaction between[Co(tmen)3]3+and[Fe(CN)6]4-have been carried out at various temperatures and pHvalues. The ion-pair formation constant Qip of the precursor complex[Co(tmen )3]3+[Fe(CN)6]4- is 5.6×102L·mol-1, and the rate constant ket for the electron transfer within the ion-pair is 6.8×10-3s-1at 25℃ and I=0.10 mol/L. The activation enthalpy △Het≠and the activation entropy △Het≠of this reaction are 1.6×102kJ/mol and 6.5×102J/mol·K respectively. The mechanism of the reaction is discussed.

Key words: Electron transfer reaction, Outer-sphere mechanism, Trichlorotritetramethylethylenediamine cobalt(Ⅲ)

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