SYNTHESIS AND PHYSICOCHEMICAL STUDIES OF SOME MIXED-LIGAND ISOTHIOCYANATONITROSYL(CRNO)(5) COMPLEXES OF CHROMIUM(I) WITH BIOLOGICALLY-ACTIVE ORGANIC-COMPOUNDS

A new series of hexa-coordinate mixed-ligand isothiocyanatonitrosyl{Cr NO}(5) complexes of chromium(I) of the type [Cr(NO)(NCS)(2)(L)(2)(H2O) ] (where L = chloropheniramine maleate, pheniramine maleate, mepyramin e maleate, isonicotinic acid hydrazide, picolinic acid hydrazide or ni cotinic acid hydrazide) have been synthesized in the solid state by th e interaction of pentaisothiocyanatonitrssylchromate(I) anion, [Cr(NO) (NCS)(5)](3-) with the appropriate biologically active organic compoun ds. The products, which have been characterized by elemental analyses, molar conductances, magnetic measurements, ESR, electronic and infrar ed spectral studies, contain chromium(I) in a low-spin {CrNO}(5) elect ron configuration. An octahedral structure has been suggested for the complexes.