Reductive nitrosylation of tetraoxometalates. single-pot and a virtually single-step synthesis of [Os(NO)(NCS)5]2- and its 1,10-phenanthroline and 2,2'-bipyridine derivatives directly from OsO4 in aqueous aerobic media

The complexes R,[OS(NO)(NCS)5] (R = AsPh,, PPh,, NMe,, or NEt,) and [Os(NO)(NCS),(L-L)] [L-L = 2,2'-bipyridyl (bipy) or 1 ,I 0-phenanthroline (phen)] have been synthesised directly from OsO, via reductive nitrosylation using NH,OH*HCI and NCS- in an acidic medium in a single step and using a single pot. The complexes have been characterised by analytical, molecular weight, molar conductance, magnetic susceptibility, i.r. and electronic spectral data.