Synthesis and physico-chemical studies of novel mixed-ligand cyanonitrosyl {CrNO}5 complexes of chromium with benzyl-, benzoyl- and acetyl-pyridines

Novel mixed-ligand cyanonitrosyl complexes of chromium(I), [Cr(NO)(CN)2(L)2(H2O)], (where L=2-, 3-, or 4-benzylpyridine, 2-(4-chlorobenzyl)pyridine, 2-, 3-, or 4-benzoylpyridine, 3-(4-methylbenzoyl)pyridine, or 2-, 3-, or 4-acetylpyridine) have been prepared by the interaction of potassium pentacyanonitrosylchromate(I) monohydrate, K3[Cr(NO)(CN)5]·H2O with L. The complexes, characterized by elemental analyses, magnetic measurements, e.s.r. and i.r. spectral studies, contain chromium(I) in a low-spind5-configuration. An octahedral structure, where CN istrans to CN, L istrans to L, and NO istrans to water is proposed for all the complexes