SYNTHESIS AND CHARACTERIZATION OF SOME MIXED-LIGAND CYANONITROSYL (CRNO)5 CHELATES OF CHROMIUM(I) WITH 8-HYDROXYQUINOLINESULPHONAMIDES

New mixed-ligand cyanonitrosyl {CrNO}5 chelates of chromium(I) of the type [Cr(NO) (CN)2 (L-L) (H2O)] have been synthesized by the interaction of the potassium pentacyano-nitrosylchromate(I) monohydrate with 8-hydroxyquinolinesulphonamides(L-L), viz., 8-hydroxyquinoline-4-(4'-tolyl)sulphonamide, 8-hydroxyquinoline-4-(phenyl)sulphonamide, 5-iodo-8-hydroxyquinoline-4-(4'-tolyl)sulphonamide, 5,7-diiodo-8-hydroxyquinoline-4-(4'-tolyl)-sulphonamide, 5,7-diiodo-8-hydroxyquinoline-4-(3'-ethoxyphenyl)-sulphonamide, 5,7-diiodo-8-hydroxyquinoline-4-(3'-methoxyphenyl)-sulphonamide, 5,7-dichloro-2-methyl-8-hydroxyquinoline-4-(3'-methoxyphenyl)sulphonamide or 5,7-dichloro-2-methyl-8-hydroxyquinoline-4-(3'-ethoxyphenyl)sulphonamide in aqueous acetic acid medium. The resulting compounds, which have been characterized through elemental analyses, electrical conductances, magnetic measurements, thermo-gravimetric analyses, electron spin resonance and infra-red spectral studies, contain chromium(I) in a low-spin {CrNO}5 electron configuration1. A suitable octahedral structure has been proposed for the chelates.