Neutral ‘3 + 1’ mixed-ligand oxorhenium(V) complexes with tridentate [S,N,S] chelates and aminoalkanethiols: synthesis, characterization and structure determination

Abstract

‘3 + 1’ Oxorhenium(V) complexes [ReO(SN(R′)S)(SR)] (R′ = Me, Et, Pr or Bu; SR = aminoalkane thiolate) have been synthesized by ligand exchange at trans-trichloromonooxo-bis(triphenylphosphine)rhenium(V) with a mixture of HSN(R′)SH and RSH in alkaline methanolic solution. The complexes were purified by column chromatography and characterized by elemental analysis, mass and IR spectroscopy and for selected compounds by ¹H NMR spectroscopy. The structures of those complexes have been determined by X-ray diffraction analysis and revealed a change in the co-ordination geometry from square pyramidal to trigonal bipyramidal, depending on the chelating (SN(R′)S) moiety. The alkyl group (R′) was found to be arranged “syn” to the oxorhenium group.