Reactivity of a benzothiazole-thiourea derivative with the oxorhenium(V) core: Isolation of rhenium(III) and (V) complexes

The reaction of trans-[ReOCl3(PPh3)2] with 1-(benzothiazol-1-yl)-3,3-dimethylthiourea (Hbdt) in benzene led to the isolation of the oxorhenium(V) complex trans-[ReOCl(bdt)2] (1). However, repeating the reaction with [ReO(OEt)I2(PPh3)2] in acetonitrile led to the formation of the rhenium(III) complex salt [Re(bdt)2(MeCN)2]I3 (2). In both distorted octahedral complexes the bdt ligands act as N,S-donor chelates, with the thiazole nitrogen atom coordinated in the site trans to the oxo group in 1. Both compounds were characterised by FTIR, 1H NMR and single crystal X-ray diffraction.

Graphical abstractThe reaction of trans-[ReOCl3(PPh3)2] with 1-(benzothiazol-1-yl)-3,3-dimethylthiourea (Hbdt) in benzene led to the isolation of the oxorhenium(V) complex trans-[ReOCl(bdt)2] (1). However, with [ReO(OEt)I2(PPh3)2] as starting complex in acetonitrile, the rhenium(III) complex salt [Re(bdt)2(MeCN)2]I3 was isolated. In both the distorted octahedral complexes the bdt ligands coordinate as N,S-donor chelates.Figure optionsDownload full-size imageDownload as PowerPoint slide