Abstract
The complex [MoCl4(EtCN)2] reacts in dichloromethane with alkaryl and triaryl tertiary phosphines to form the paramagnetic, maroon complexes trans-[MoCl4L2](L = tertiary phosphine). In ethanol, however, tertiary phosphines react with the ethyl cyanide complex to yield the diamagnetic oxo-complexes, mer-[MoOCl2L3], which are also obtained directly from molybdenum pentachloride and the phosphine in ethanol. These, by metathesis, give the complexes mer-[MoOX2L3](X = I, Br, NCS, or NCO). The oxo-complexes are generally green or blue according to whether the oxygen is trans to L or X respectively. 1H n.m.r. and i.r. spectra were determined for structural diagnosis.
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