Synthesis and Characterization of a Novel Mixed-Ligand Cyanonitrosyl {CrNo}5Complex of Chromium with Analgin: A Potentially Tridentate 5-Pyrazolone Ligand

摘要

A novel mixed-li gand cyanonitrosyl complex of chromium (having {CrNO}5electron configuration1), formed by the interaction of potassium pentacyanonitrosylchromate(I) monohy-drate, K3Cr(NO)(CN)5. H2O, with analgin (1-phenyl-2, 3-dimethyl-5-pyrazolone-4-methylaminomethanesulphonate sodium monohydrate) has been isolated. The product, which has been characterized by elemental analyses, molar conductance, molecular weight determination, thermogravimetric analysis, magnetic measurement, electron spin resonance and infrared spectral studies, possesses the formula Cr(NO)(CN)2(AGNa)2(H2O) (where AGNa - analgin) and it contains chromium(I) in a lowspin d5configuration. An octahedral structure, where CN istransto CN and AGNa istransto AGNa in equatorial positions, and NO istransto water at the axial position, has been proposed for the complex.