Preparation and crystal structures of new phenoxide derivatives of tungsten(VI) oxytetrachloride

Abstract

Two oxotungsten(VI) complexes of the type [WOCl 2(OAr) 2] (OAr=OC 6H 3 t Bu-2-Me-6 or OC 6H 2 t Bu-2-Br-4-Me-6) were prepared by the reaction of WOCl 4 with 2 equiv. of phenolic ligand precursors in a refluxing toluene solution. Both compounds form monomeric units, in which the tungsten ion has adopted a square pyramidal coordination geometry with the oxo ligand in the apical position and phenoxide groups bound in a trans orientation.