Abstract
The cluster [Fe 2S 2(SBu t) 4] 2− on reacting with L-cysteine ethyl ester hydrochloride (HCys-OEt · HCl) converts to the tetranuclear cysteinate-bound cluster [Fe 4S 4(Cys-OEt · HCl) 4] 2−. In contrast, the dinuclear tyrosinate-bound cluster [Fe 2S 2(Tyr-OMe) 4] 2− (HTyr-OMe = L-tyrosine methyl ester) can be prepared from either [Fe 2S 2(SBu t) 4] 2−, or as a decomposition product in the reaction of hexanuclear [Fe 6S 6Cl 6] 3− with NaTyr-OMe. Under appropriate conditions the hexanuclear tyrosinate-bound cluster [Fe 6S 6(Tyr-OMe) 6] 3− can be isolated. The thermal stability of clusters [Fe 6S 6(XR) 6] 3− (X=S, O) toward conversion to tetranuclear [Fe 4S 4(XR) 4] 2− lies in the order tyrosinate-≥phenolate->thiophenolate-bound cluster. 1H NMR and Mössbauer spectroscopies are used to unequivocally identify the products.
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