Effect of Added Pyridine Bases on the Electron Transfer Reaction of Chromium(VI) with Organic Sulfides. Spectral Evidence for the Formation of a Chromium(V) Intermediate

Author: Manohar Thiruneelakandan   Rajkumar Muthuraman   Rajagopal Seenivasan  

Publisher: Springer Publishing Company

ISSN: 0340-4285

Source: Transition Metal Chemistry, Vol.31, Iss.4, 2006-05, pp. : 549-555

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Abstract

The electron transfer reaction of Cr(VI) with organic sulfides is facilitated by added pyridine bases 2,2′-bipyridine, 1,10-phenanthroline, picolinic acid and pyridine 2,6-dicarboxylic acid. The added base forms a Cr(VI)-base adduct carrying positive charge which acts as a more reactive oxidant compared to Cr(VI). UV–Visible spectrophotometric study provides evidence for the formation of Cr(V) as the intermediate. The reactions in the absence and presence of pyridine bases follow the reactivity–selectivity principle.