Abstract
Molybdenum-95 NMR chemical shifts are reported for a range of molybdenum(0) carbonylate anions of the type [Mo(CO) 5X] − formed by warning dimethylsulfoxide solutions of molybdenum hexacarbonyl and alkali metal hydroxide, halide and pseudohalides. The chemical shift values extend over a thousand ppm and reflect the importance of ligand field strength, polarizability and electronegativity factors in determining the Mo-95 chemical shifts; the ‘normal halogen dependence’ is confirmed for these d 6 species. The decreasing shielding effects of the coordinated anions in the [Mo(CO) 5X] - complexes is in the order H − > CN − > I − > NCO − > NCS − > NCSe − > Br − > N 3 − > NO 2 − > Cl − > O 2CH − > O 2N − > OCH 3 − > F −.
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