Synthesis and physico-chemical studies of novel mixed-ligand cyanonitrosyl {CrNO}5 complexes of chromium with benzyl-, benzoyl- and acetyl-pyridines |
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| Authors: | Ram C. Maurya Dinesh C. Gupta Rajesh Shukla Raj K. Shukla Wahid U. Malik |
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| Affiliation: | (1) Department of Chemistry, Atarra P.G. College, 210201 Atarra, India;(2) Department of Chemistry, Roorkee University, 247667 Roorkee, India;(3) Present address: Vice-Chanceller, Allahabad University, Allahabad, U.P., India |
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| Abstract: | Summary 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 complexesEnemark and Feltham(1) have proposed circumventing the problem of the non-innocent nature of the nitrosyl ligand by considering nitrosyls as containing the {MNO}n group, wheren is the number of electrons of M, plus the number of electrons in the  *-orbital of the NO (or more convenientlyn is the number of d-electrons if nitrosyl is regarded as being coordinated as NO+) |
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