Synthesis and structure of a rhenium(V) complex containing a tridentate imido-coordinated Schiff base

Abstract

The six-coordinate complex [Re(mps)Cl₂(PPh₃)] (1) (H₃mps = N-(2-amino-3-methylphenyl) salicylideneimine) was prepared by the reaction of [NH₄][ReO₄] with H₃mps in the presence of triphenylphosphine and hydrochloric acid in glacial acetic acid. Crystallization from acetonitrile gave the product 1.CH₃CN. The compound was characterized by spectroscopy and X-ray crystallography. The results show that the tridentate mps ligand coordinates via the doubly deprotonated 2-amino nitrogen (which is present in 1 as an imide), the neutral imino nitrogen and the phenolate oxygen. The imide and phenolate oxygen are trans to each other in a distorted octahedral geometry around the rhenium(V) centre, with the two chlorides in cis positions.

KEY WORDS: Reduction of perrhenate, Rhenium(V), Imido donor atom, Crystal structure

Bull. Chem. Soc. Ethiop. 2008, 22(1), 101-105.