Carbonyl halides of the Group VI transition metals. XXVII. Carbon-13 N.M.R. studies on molybdenum compounds

Abstract

Carbon-13 nuclear magnetic resonance studies have been carried out on a number of molybdenum(II) carbonyl halide species. It has been found that for these seven-coordinate capped octahedral complexes there is a very large shift to high frequency for a carbonyl group in the capping position. Thus carbon-13 n.m.r. provides a useful tool to distinguish between possible isomers. Trends in stability and isomer formation previously suspected from circumstantial evidence can now be rationalized.