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N-bromosuccinimide oxidation of a Ternary complex of Iminodiacetatochromium(III) involving DL-aspartic acid co-ligand

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Author Affiliations

  • 1Chemistry Department, Faculty of Science, King Abdulaziz University, P.O Box.80203, Jeddah, 21589, SAUDI ARABIA
  • 2Chemistry Department, Faculty of Science, Alexandria University, Alexandria, EGYPT
  • 3Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef City, EGYPT

Res.J.chem.sci., Volume 6, Issue (1), Pages 1-7, January,18 (2016)

Abstract

The kinetics of the oxidation of chromium(III)-complex, [Cr(IDA)(Asp)(H2O)2] (IDA = Iminodiacetic acid and Asp = DL-aspartic acid) to Cr(VI) have been carried out in the temperature range 20 – 40 oC. Reaction obeyed first order dependence with respect to [NBS] and [Cr(III)], and the rate of reaction increases with increasing of pH for the range 6.08 – 7.04. Experimentally, the mechanism of this reaction is found to be consistent with the rate law in which the hydroxo species, [CrIII(IDA)(Asp)(H2O)(OH)]- is considerably much more reactive than their conjugate acid. CTAB enhanced the reaction rate while SDS inhibits one. ΔH* and ΔS* have been calculated. It is proposed that electron transfer occurs through an inner-sphere mechanism.

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