Coordination Behaviour of Some Aryl and Thiazolyl Hydrazones towards Dioxomolybdenum(VI)

Abstract

Aryl and thiazolyl hydrazones were synthesized by coupling reaction of diazotized solution of aniline, o-toluidine, 2-aminobenzothiazole and its methyl derivative with acetoacetanilide. These compounds were used as ligands and their dioxomolybdenum (VI) complexes were synthesised. On the basis of elemental analysis their compositions were proposed as MoO₂L·H₂O, where L =
thiazolylhydrazone and MoO₂L·2H₂O, where L = arylhydrazones.
All the complexes were found to be diamagnetic and nonelectrolytic
in nature. The IR spectral studies revealed that after
enolisation and subsequent deprotonation the thiazolyl hydrazones
behaved as NOS donor dinegative ligand whereas aryl hydarazones
behaved as NO donor dinegative ligands towards MoO²⁺₂ ion. All
the complexes were cis-dioxo complexes. Pseudo octahedral
geometry was tentatively proposed for all the synthesised complexes.