Electron transfer reaction of Oxo(salen)chromium(V) ion with anilines

Premsingh, Sundarsingh ; Sathiyamoorthy Venkataramanan, Natarajan ; Rajagopal, Seenivasan ; Mirza, Shama. P. ; Vairamani, Mariappanadar ; Sambasiva Rao, P. ; Velavan, K. (2004) Electron transfer reaction of Oxo(salen)chromium(V) ion with anilines Inorganic Chemistry, 43 (18). pp. 5744-5753. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic049482w

Related URL: http://dx.doi.org/10.1021/ic049482w

Abstract

The kinetics of oxidation of 16 meta-, ortho-, and para-substituted anilines with nine oxo(salen)chromium(V) ions have been studied by spectrophotometric, ESIMS, and EPR techniques. During the course of the reaction, two new peaks with λmax at 470 and 730 nm appear in the absorption spectrum, and these peaks are due to the formation of emeraldine forms of oligomers of aniline supported by the ESIMS peaks with m/z values 274 and 365 (for the trimer and tetramer of aniline). The rate of the reaction is highly sensitive to the change of substituents in the aryl moiety of aniline and in the salen ligand of chromium(V) complexes. Application of the Hammett equation to analyze kinetic data yields a ρ value of -3.8 for the substituent variation in aniline and +2.2 for the substituent variation in the salen ligand of the metal complex. On the basis of the spectral, kinetic, and product analysis studies, a mechanism involving an electron transfer from the nitrogen of aniline to the metal complex in the rate controlling step has been proposed. The Marcus equation has been successfully applied to this system, and the calculated values are compliant with the measured values.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:54955
Deposited On:18 Aug 2011 12:17
Last Modified:19 Aug 2011 04:18

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