Hammett correlations as test of mechanism of CO-induced disulfide elimination from dinitrosyl iron complexes

doi:10.1039/C4SC01523A

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Title:	Hammett correlations as test of mechanism of CO-induced disulfide elimination from dinitrosyl iron complexes
Authors:	Randara Pulukkody;Samuel J. Kyran;Michael J. Drummond;Hsieh, Chung-Hung;Donald J. Darensbourg;Marcetta Y. Darensbourg
Contributors:	淡江大學化學學系
Date:	2014-10
Issue Date:	2014-08-27 09:20:30 (UTC+8)
Publisher:	Cambridge: R S C Publications
Abstract:	The displacement of RS˙ from [(NHC)(SPh)Fe(NO)2] (NHC = N-heterocyclic carbene) by carbon monoxide follows associative kinetics, rate = k [CO]1 [(NHC)(SPh)Fe(NO)2]1, resulting in reduction of the oxidized form of the dinitrosyliron unit, {Fe(NO)2}9 (Enemark–Feltham notation) to {Fe(NO)2}10. Thermodynamically driven by the release of PhS–SPh concomitant with formation of [(NHC)(CO)Fe(NO)2], computational studies suggested the reactant dinitrosyliron unit serves as a nucleophile in the initial slanted interaction of the π* orbital of CO, shifting into normal linear Fe–CO with weakening of the Fe–SPh bond. The current study seeks to experimentally test this proposal. A series of analogous {Fe(NO)2}9 [(NHC)(p-S–C6H4X)Fe(NO)2] complexes, with systematic variation of the para-substituents X from electron donor to electron withdrawing groups was used to monitor variation in electron density at the Fe(NO)2 unit via Hammett analyses. Despite the presence of non-innocent NO ligands, data from ν(NO) IR spectroscopy and cyclic voltammetry showed consistent tracking of the electron density at the {Fe(NO)2} unit in response to the aryl substituent. The electronic modifications resulted in systematic changes in reaction rates when each derivative was exposed to CO. A plot of the rate constants and the Hammett parameter σp is linear with a negative slope and a ρ value of −0.831; such correlation is indicative of rate retardation by electron-withdrawing substituents, and provides experimental support for the unique role of the delocalized frontier molecular orbitals of the Fe(NO)2 unit.
Relation:	Chemical Science 5(10), pp.3795-3802
DOI:	10.1039/C4SC01523A
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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