Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (04): 500-504.doi: 10.3866/PKU.WHXB19920414

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Kinetics of Oxidation of Sodium Tartrate by Ni(IV) Periodate Complex in Aqueous Alkaline Medium

Xie En-Hai; Meng Qing-Shui; Wang Zhi-Pu   

  1. Department of Chemistry, Hebei University, Baoding 071002
  • Received:1990-12-16 Revised:1991-06-07 Published:1992-08-15
  • Contact: Wang Zhi-Pu

Abstract: The kinetics and mechanism of electron transfer from sodium tartrate to Ni(Ⅳ) periodate complex have been studied in aqueous alkaline medium using spectroscopic and stopped-flow method. The kinetics exhibits a pseudo first order for the disap-pearance of Ni(Ⅳ) periodate complex when substrate is present in excess. The order for the substrate found is not an integer. Additon of NaIO_4 and NaOH affects the reaction rates. Results are interpreted in terms of a mechanism involving two separated steps of one-electron transfer from the substrate to the species containing Ni(IV). The activation parameters of this reaction have been calculated.

Key words: Diperiodatonicolate, Stopped-Flow method, Kinetics and mechanism, Redox reaction