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Direct studies on 5-coordinate intermediates formed during substitution at tetrahedral Fe sites: Role of bound nucleophile in labilisation of leaving group

Lookup NU author(s): Brendan Garrett, Professor Richard Henderson


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The substitution reactions of the tetrahedral Fe sites in [FeCl 4]-, [Fe2S2Cl4] 2-, [Fe4S4Cl4]2- and [{MoFe3S4Cl3}2(-SEt) 3]3- with 4-RC6H4S- (R = MeO, Me, H, Cl or NO2) all involve rapid binding of the thiolate to a Fe site and formation of a kinetically and spectroscopically detectable intermediate. Kinetic studies allow calculation of the rate of Fe-Cl dissociation from the 5-coordinate site of the intermediate (k2R). The rate of Fe-Cl dissociation from the intermediate exhibits a marked dependence on the nature of the bound thiolate with log 10(k2R) increasing in a linear manner with the calculated NBO charge on the sulfur atom of the coordinated thiolate. This behaviour indicates that Fe-Cl bond dissociation at the 5-coordinate intermediate involves a process in which Fe-thiolate bond shortening occurs prior to movement of the Fe-Cl bond. © The Royal Society of Chemistry 2007.

Publication metadata

Author(s): Garrett B, Henderson RA

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2007

Issue: 31

Pages: 3435-3439

Date deposited: 05/07/2010

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry


DOI: 10.1039/b706272a


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