Synthesis and Characterisation some Mixed-Ligand Cyanonitrosyl {CrNO}5 Complexes of Chromium(I) with some Aniline and 2-Pyrazolin-5-one Derivatives

Coordination Chemistry Laboratory, Department of P. G. Studies and Research in Chemistry, R. D. University, Jabalpur-482 001 Manuscript received 4 May 1990, revised 12 August 1992, accepted 18 August 1992 Mixed-ligand hexacoordinated cyanonitrosyl {CrNO}5 complexes of chromium(I) of the compositions, Cr(NO) (CN)2(L)2 (H2O)] (where L=N-methylaniline, N-ethyl-o-toluidine, N-ethyl-p-tolnidine, N,N-dimethyl-m-toluidine or N-benzyl-N-ethyl­aniline) and [Cr(NO) (CN)2(L-L) (H2O)] (where L-L=.4-benzoyl-1-(4-toly1)-, 4-propionyl-1-(4'-tolyl)-,4-chloroacetyl-1-(4'-tolyl)-,4-chlorobenzoyl-1-(4'-toly1)-, or 4-phenacyl-1-(4'-toly1)-3-methyl-2-pyrazolin-5-one) have been prepared in the solid state by the interaction of potassium pentacyanonitrosylchromate(I) monohydrate with the said ligands L and L-L. The complexes contain chromium(I) in a low-spin {CrNO}5 electron configuration