Biotech Today: An International Journal of Biological Sciences
  • Year: 2016
  • Volume: 6
  • Issue: 1

Iridium (Iii) Catalysed Oxidation Of Reducing Sugars By N-Bromosuccinmide In Acidic Medium

Dept. of Chemistry, DAVPG College, Lucknow, India

*Corresponding author E-mail: -vshingh.lkw32@gmail.com

Online published on 6 July, 2016.

Abstract

The Kinetics of the homogeneously iridium (III) catalysed oxidation of mellibiose (meli) and cellobiose (celo) by N-Bromo-Succinimide (NBS) in HClO4 in the presence of [Hg(OAc)2] as a scavenger for Br− has been investigated. The reactions are zero order with respect to both of the sugars, and first order in NBS. The order in Ir(III) decreases from unity to zero at high Iridium (III) concentrations. A negative effect on the oxidation rate is observed for [H+], [Cl−] and succnimide (NHS). Ionic strength (μ) and Hg(II) do not influence the oxidation rate and HOBr and [IrCl5(H2O)]2- are postulated as the oxidizing and catalytic species. A mechanism confirming to the observed kinetic data is proposed.

Keywords

Ir (III) Chloride, catalysis, HClO4 medium, oxidation reducing sugars, N-Bromosuccinimide