NOVEL 8-COORDINATE CIS-MOO2(VI) COMPLEXES WITH SOME 4-AMINOANTIPYRINESCHIFF-BASE DERIVATIVES

The synthesis and characterisation of some 8-coordinate cis-dioxomolyb denum(VI) complexes of Schiff bases derived from 4-aminoantipyrine and 4-acetyl-3-methyl-1-phenyl-2-pyrazolin-5-one, 3-methyl-1-phenyl-4-pro pionyl-2-pyrazolin-5-one, and 4-benxoyl-3-methyl-1-phenyl-2-pyrazolin- 5-one are reported. Spectroscopic and other analytical data reveal tha t these Schiff bases behave as monobasic tridentate ligands and react with [MoO2(acac)(2)] in 2:1 ratio to give diamagnetic molybdenum(VI) m ononuclear complexes having the general formula cis-MoO2(L)(2) (L=Schi ff base). These complexes were characterised by elemental analysis, mo lar conductance, IR, UV-vis, H-1 NMR, and cyclic voltammetry.