Abstract
Three diiron 1,2-dithiolate complexes with a trans-cinnamate ester have been characterized. Esterification of [Fe2(CO)6{μ-SCH2CH(CH2OH)S}] (1) with trans-cinnamic acid in the presence of N,N′-dicyclohexylcarbodiimide and 4-dimethylaminopyridine afforded [Fe2(CO)6[μ-SCH2CH(CH2O2CCH = CHPh)S}] (2) in 94% yield. Carbonyl substitution of 2 with a monophosphine ligand tris(4-fluorophenyl)phosphine or tris(2-methoxyphenyl)phosphine in the presence of Me3NO·2H2O resulted in formation of the corresponding monophosphine-substituted complexes [Fe2(CO)5 {P(C6H4F-4)3}{µ-SCH2CH(CH2O2CCH = CHPh)S}] (3) and [Fe2(CO)5{P (C6H4OCH3-2)3}{µ-SCH2CH(CH2O2CCH = CHPh)S}] (4) in 79% and 84% yields, respectively. Complexes 2-4 were structurally characterized by elemental analysis, spectroscopy and X-ray crystallography. Moreover, electrochemical properties of 2-4 were investigated.
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