Novel oxorhenium(V) ‘3+1’ mixed ligand complexes with 3-thiapentane-1,5-dithiolate and functional mercaptobenzoyl amino acid ethyl ester

Oxorhenium(V) complexes with ‘3+1’ mixed ligands, [ReO(SSS)L], where SSS is η3-(SCH2CH2SCH2CH2S), L = η1-(C6H4COOH-4-S), η1-(C6H4CONHCH2COOEt-4-S), η1-(C6H4CONHCH(CH3)COOEt-4-S), and η1-(C6H4CONHCH(CH2Ph)COOEt-4-S), have been synthesized. These L ligands and [ReO(SSS)L] complexes were characterized by IR, 1H NMR, 13C NMR, and MAS spectrometers. Molecular structure of [ReO(SSS){η1-(C6H4COOH-4-S)}] complex was determined to be a distorted square pyramidal by single crystal X-ray analytical method.

Graphical abstractThe functional ligands N-para mercaptobenzoyl amino acid ethyl esters have been prepared by coupling of para-mercapto benzoic acid with the amino acid ethyl esters using the conventional 1,3-dicyclohexylcarbodiimide and 1-hydroxy-benzotriazole. Oxorhenium(V) ‘3+1’ mixed ligand complexes were synthesized by using bifunctional approach with bis(2-mercaptoethyl)sulfide and functionalized N-para-mercaptobenzoyl amino acid ethyl esters.Figure optionsDownload full-size imageDownload as PowerPoint slide