Synthesis and characterization of Ni(II) complex with Schiff base derived from benzophenone and ۲-aminophenol

A Schiff base ligand was obtained when benzophenone and ۲-aminophenol reacted with each other under normal circumstances. Interaction of the Schiff base ligand with NiCl۲.۶H۲O gave rise to hydrated, ash coloured complex of high thermostability. Characterization using some physicochemical techniques such as solubility, melting point, molar conductivity and FT-IR were carried out. The results revealed the solubility of the synthesized compounds in different solvents. The water of crystallization was calculated to constitute ۲.۸ %, consistent with ۱ water molecule of crystallization. On subjection to conductivity measurement, an observed molar conductance of ۲.۵۵ ohm-۱cm۲mol-۱ proved that the complex is a non-electrolyte. The FT-IR spectrum of the ligand exhibits a band at ۱۶۸۴.۸۸ cm-۱ attributed to vC=N which shifted to a higher frequency in the spectrum of the complex. This shifting indicates that the ligand coordinates to the Ni(II) ion via the azomethine nitrogen. On the basis of spectral analysis, the complex could be formulated as [NiL۲].H۲O. It could be inferred that the ligand behaved as monoanionic bidentate ligand with the azomethine nitrogen (N) and phenol oxygen (O) as the coordination sites assuming a four coordinates square planar geometry.

Keywords:

Thermostability , Square planar , Monoanionic bidentate ligand , azomethine