International Science Community Association Research Journal of Chemical Sciences 2231 - 606X 6 1 2016 January 18 N-bromosuccinimide oxidation of a Ternary complex of Iminodiacetatochromium(III) involving DL-aspartic acid co-ligand 1 7 EN A Ewais Hassan 1 Chemistry Department, Faculty of Science, King Abdulaziz University, P.O Box.80203, Jeddah, 21589, SAUDI ARABIA Abdel-Salam Ahmed H 2 Chemistry Department, Faculty of Science, Alexandria University, Alexandria, EGYPT Ismail Mohamed K 3 Chemistry Department, Faculty of Science, Beni-Suef University, Beni-Suef City, EGYPT > Research Paper 2015 8 30 2016 January 18 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. ∆H* and ∆S* have been calculated. It is proposed that electron transfer occurs through an inner-sphere mechanism. Copyright@ International Science Community Association