SYNTHESES AND SPECTRAL PROPERTIES OF DINITROSYLMOLYBDENUM(0) AND DIOXOMOLYBDENUM(VI) COMPLEXES

Syntheses of dinitrosylmolybdenum(0) complexes of Schiff bases derived from salicylaldehyde, 5-chlorosalicylaldehyde, o-hydroxyacetophenone, and p-nitrobenzoylhydrazide have been carried out in one step by the reaction of Mo(acac)2(NO)2! (acacH=acetylacetone) and the Schiff base s. The complexes are of the type Mo-(LH)2(NO)2! (LH2=Schiff base) in which Schiff bases behave as monobasic bidentate ligands and coordinat e to molybdenum through the azomethine nitrogen and enolic oxygen of t he hydrazide moiety after deprotonation. Two geometrical isomers with nitrosyl groups trans to each other have been noticed in solution. Dio xomolybdenum(IV) complexes of the above Schiff bases have also been sy nthesized using MoO2(acac)2! as precursor for comparison.