A synthetic route to cationic ‘3 + 2’ oxorhenium(V) complexes containing imidazole derivatives

Abstract

The neutral complex [ReOBr₂(tmi)] [Htmi = 2-(1-ethanolthiomethyl)-1-methylimidazole] was synthesized by reaction of (n-Bu₄N)[ReOBr₄(OPPh₃)] with an equimolar amount of Htmi in acetonitrile. The ‘3 + 2’ complex [ReO(tmi)(mi)]Cl [Hmi = 2-(hydroxymethyl)-1-methylimidazole] was isolated from a one-pot reaction of (n-Bu₄N)[ReOCl₄] with Htmi and Hmi in equimolar quantities in acetonitrile. The compounds were characterized by spectroscopic methods and X-ray crystallography. Both complexes have distorted octahedral geometries with the alcoholate oxygen of tmi coordinated trans to the oxo group.

Keywords:

• Oxorhenium(V)
• Crystal structure
• Didentate
• Terdentate