The design and synthesis of suitable multi dentate ligands provide a significant contribution for the development of coordination chemistry, where a class of ligands having the azine fragment (C=N-N=C) appears to be of a very important type. Between the two nitrogen atoms of the C=NN=C Fragment only one (which comes from the condensation) takes part in complex formation in the majority of cases. Hydrazones have wide applications in the field of analytical and medicinal chemistry and exhibit physiological activities in the treatment of several diseases such as tuberculosis. This activity is attributed to the formation of stable chelatecomplexes with transition metals which catalyze physiological processes. In view of the foregoing discussion and the continued interest in coordination chemistry, our present work manifests the preparation of a new unsymmetrical Schiff base ligand and its Ni(II) complex. In the first step, we have prepared the new unsymmetrical NO ligand functionalized with NH2 groups by Schiff condensation of hydrazine with 2-hydroxy-1-naphtaldehyde. In the second step, the NH2-functionalized compound was made to react with 5-(4-NO2-phenyl)-azosalicylaldehyde for producing the resultant ligand (Fig.1). The new ligand was characterized by IR, 1H NMR, UV–Vis absorption and elemental analysis. Furthermore, a new complex of Ni (II) was also obtained by direct reaction of Schiff base ligand and Ni(II) ion in THF. The resultant complex was identified via IR and UV-Vis spectroscopy and C, H, N elemental analysis.
