Microwave Assisted Synthesis, Characterisation and Fluorescence Studies of some Transition Metal Complexes with a Luminol Derivative.

A novel heterocyclic luminol derivative was synthesized by coupling diazotized 5-aminophthalhydrazide with 2-naphthol. This compound viz., Phthalhydrazide-5-azo-2-naphthol is versatile in forming stable metal complexes with cobalt(II), nickel(II), copper(II) and zinc(II) ions under microwave assisted solvent free conditions. The ligand and the metal complexes were characterized on the basis of elemental analyses, molar conductance, magnetic susceptibility measurements, UV-Visible, IR, 1H NMR, and ESR spectral studies wherever possible and applicable. The fluorescence spectra of the ligand and its metal complexes were also recorded. The fluorescence life time measurements were conducted and it was observed that binding of the ligand to the metal ion decreases the average life time of the metal complexes.