Neutral oxorhenium(V) complexes with tridentate dithiolates and monodentate alkane- or arene-thiolate coligands

Abstract

Oxorhenium(V) complexes [ReO(SXS)(SR)](where HSXSH = 3-thia- or 3-oxa-pentane-1,5-dithiol and RSH = alkane- or arene-thiol) have been synthesized by a ligand exchange reaction of [NEt₃(CH₂Ph)][ReOCl₄] with a mixture of HSXSH and RSH in methanol–acetonitrile. The compounds were purified by column chromatography or preparative TLC and characterized by elemental analysis, infrared and ¹H NMR spectroscopy. The structure of (4-methoxybenzenethiolato)(3-oxapentane-1,5-dithiolato)oxorhenium(V) has been determined by X-ray crystallography. The co-ordination is square-pyramidal with the Re atom displaced from the basal plane by 0.728 Å. Co-ordination of the ether group is indicated by the short Re–O(ether) bond distance of 2.103 Å.