Synthesis and characterization of cobalt complexes of diacetyl bis(4-methoxybenzoyl hydrazone)

Abstract

The preparation and characterisation of some new Co(II and III) complexes derived from diacetyl bis(4-methoxybenzoyl hydrazone), (H₂dambhon) and cobalt salts under varied reaction conditions are reported. Reduction of [Co^II(dambhon)], isolated in this study, with Na(Hg) in THF under N₂ afforded Na[Co^I(dambhon)], subsequent reaction of which with RX and normal work up gave many new organocobalt (III) complexes of the type [RCo^III(dambhon)H₂O], which on treatment with L (L= NH₃, Py or Ph₃P) afforded [RCo^lll(dambhon)L]. The stereochemistry of the isolated solid complexes have been discussed by elemental analyses, molar conductance values, magnetic susceptibilities and spectroscopic (lR and electronic) data. Depending on the reaction condition, the ligand can function either as a monobasic quadridentate or dibasic quadridentate ONNO donor ligand.