Group VI and V Donors

This yellow, diamagnetic complex provides one of the few examples of metal hydrido compounds which contain only saturated ammine ligands. Osmiuin(v).—Further Os -arylimido-complexes have been synthesized via the reaction of phosphinimines with [OsOCl3(PPh3)2]  

These paramagnetic, air-stable complexes could equally well be formulated as Os arylnitrenes. Both crystal-field and charge-transfer bands have been observed in the diffuse reflectance spectrum of [OSF5] . Calculation of the spin-orbit coupling constant and crystal-field parameters indicated that the degree of covalency is high for a fluorocomplex, and comparable with that found for quadrivalent [MFg] species of the first transition series.  

Osmiumfvi).—The i.r. spectrum of [OsOCl ] has been recorded in the gas and liquid phases, and in solution. While the exact geometry could not be deduced, evidence was obtained for facile co-ordination of acetone or ether to the species in inert solvents. A mass spectral study of this complex reveals a complex fragmentation pattern, including the previously unknown [OsOClj] species.  

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