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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
Published on: August 12, 2019
Diiron carbonyl complexes possessing a {Fe(II)Fe(II)} core: synthesis, characterisation, and electrochemical
Zhiyin Xiao1, Zhenhong Wei, Li Long
1College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, 314001, China.
Abstract:
Two diferrous complexes, [Fe(2)(μ-SCH(2)CH(3))(3)(CO)(5)I] and [Fe(2)(μ-SCH(2)CH(2)CH(3))(3)(CO)(5)I] were synthesised via reaction of a monoiron carbonyl precursor, [Fe(CO)(4)I(2)], with ethanethiolate and propanethiolate, respectively. The complexes were fully characterised using spectroscopic techniques, for instance, FTIR and NMR. Their crystal structures were determined using single crystal diffraction analysis. Electrochemical reduction of these complexes are temperature-dependent. At room temperature, the diferrous complexes undergo one-electron reduction. The reduction-initiated cleavage of one bound thiolate and one iodide as a radical, takes the oxidation states of the diiron core from {Fe(I)Fe(II)} to {Fe(I)Fe(I)}. This reduction-initiated transformation can be suppressed by lowering the temperature to 195 K, further reduction of the monoanion was observed at a potential very close to that of the first reduction, which is analogous to the mechanism observed for diiron complexes with a core of {Fe(I)Fe(I)}.
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