Diglyme (C6H14O3) complexes of molybdenum and tungsten: crystal structures of [MO2Cl2(C6H14O3)](M = Mo or W)

Abstract

The diglyme complexes [MO₂Cl₂(C₆H₁₄O₃)](M = Mo or W) have been prepared by reaction of MoO₂Cl₂ or WOCl₄–Me₃SiOSiMe₃ with diglyme. X-Ray diffraction studies have shown that in these complexes the metals exhibit distorted-octahedral geometry, with cis-dioxo and trans-chloro ligands. Two ether oxygen atoms are co-ordinated trans to the oxo ligands leaving one terminal oxygen atom of the ligand uncomplexed. Assignments of metal–ligand stretching vibrations as observed by IR and Raman spectroscopy are presented. Variable temperature ¹³C-{¹H} NMR spectra in CD₂Cl₂ solution indicate rapid intramolecular exchange between free and bound terminal oxygen atoms.