Diiron ethanedithiolate complexes with acetate ester: Synthesis, characterization and electrochemical properties

Publication date: 1 September 2018Source: Journal of Organometallic Chemistry, Volume 870Author(s): Meng Lian, Jiao He, Xiao-Yong Yu, Chao Mu, Xu-Feng Liu, Yu-Long Li, Zhong-Qing JiangAbstractFive diiron ethanedithiolate complexes bearing acetate ester have been prepared and characterized. Esterification of complex [{μ-SCH2CH(CH2OH)S}Fe2(CO)6] (1) with acetic acid in the presence of N,N′-dicyclohexylcarbodiimide and 4-dimethylaminopyridine gave the acetate ester [{μ-SCH2CH(CH2O2CCH3)S}Fe2(CO)6] (2) in 94% yield. Further treatment of complex 2 with a monophosphine ligand triphenylphosphine, tricyclohexylphosphine, tris(2-methoxyphenyl)phosphine or tris(4-tolyl)phosphine in the presence of Me3NO·2H2O resulted in the formation of the corresponding monophosphine-substituted diiron derivatives [{μ-SCH2CH(CH2O2CCH3)S}Fe2(CO)5L] (L = PPh3, 3; PCy3, 4; P(C6H4OCH3-2)3, 5; P(C6H4CH3-4)3, 6) (Cy = cyclohexyl) in 69–87% yields. The complexes 2–6 were characterized by elemental analysis and spectroscopy, together with X-ray crystallography. Furthermore, the electrochemical properties were investigated by cyclic voltammetry.Graphical abstractFive diiron ethanedithiolate complexes bearing acetate ester have been prepared by esterification or carbonyl substitution. The new complexes were characterized by elemental analysis, IR and NMR spectroscopy, as well as by X-ray crystallography. In addition, electrochemical properties were studied by cyclic voltammetry.

Source: Journal of Organometallic Chemistry - July 11, 2018 Category: Chemistry Source Type: research