SYNTHESIS AND STRUCTURE OF COMPLEXES BY CO(II) AND NI(II) WITH PYRIDINOYLHYDRAZONES OF PYRUVIC ACID

Abstract

The interaction of MX2 (M = Co2+, Ni2+; X = Cl-, CH3COO-, NO3-) with nicotinoyl- and isonicotinoyhydrazones of pyruvic acid (H2Npv, H2Ipv) in metanol has been studied. Methods are developed and 8 new complexes are first synthesized: — with Co2+, Ni2+ chlorides: [NiCl(HNpv)(H2O)2] (I), [NiCl(HIpv)(H2O)2] (II), [CoCl(HNpv) (H2O)2] (III), [CoCl(HIpv)(H2O)2] (IV); — with Co2+, Ni2+ acetates and nitrates: [Ni(HNpv)2]2CH3OH (V), [Ni(HIpv)2]2CH3OH (VI), [Co(HNpv)2]CH3OH (VII), [Co(HIpv)2]CH3OH (VIII). Complexes have been characterized by a set of methods element analysis, thermogravimetry, IR and diffuse reflection spectroscopy, mag­netic susceptibilites measurings. The scheme of their structure has been proposed. It was established that in all complexes was implemented the same monodeproto- natid ketone form HLpv- with coordination through the azometine nitrogen atom and carbonilic and carboxylic groups oxygens, without the participation of the pyridine nitrogen.

Keywords

• координація, комплексні сполуки, піридиноїлгідразони піровиноградної кислоти