Synthesis, characterizations and anti-corrosion screening of Ni(II) complex derived from N,N-Bis (Salicylidene) Ethylenediamine / Sabariah Mohd Rofi

The study was conducted to synthesize, characterize and perform anti-corrosion screening on N,N-bis (salicylidene) ethylenediamine or (Salen) and its Ni(II) complex namely [Ni (N,N-bis (salicylidene) ethylenediamine)hydrate]. The N,N¬ bis (salicylidene) ethylenediamine and its metal complex, [Ni (N,N-bis (salicylidene) ethylenediamine) hydrate] were successfully synthesized by condensation process. Then the synthesized compounds were characterized by elemental analysis, ATR-IR, UV-Vis spectroscopy, molar conductivity and melting point determination. The results of elemental analysis for the synthesized compounds were in good agreement with the theoretical value. From the IR spectrum for ligand, an important peak of v(C=N) was observed at 1631 cm-1 which confirm the successful formation of Schiff base. This value shifted to lower frequency after complexation showing that the azomethine nitrogen was involved in coordination with metal center. The UV-Vis spectroscopy analysis shows two types of transition in both compounds which were assign for rr- rr• and n- rr• at 215-330 nm and 215-420 nm respectively. The presence of band> 400 nm in UV¬ Vis spectral for complex were assigned for d-d transition. The molar conductivity result shows that the Ni(II) complex was non-electrolyte with formula [Ni(C16H14N2O2)].H2O.The corrosion inhibition study displayed the inhibitor efficiency of Ni(II) complex was higher than free ligand. The inhibitor concentration also influence the corrosion rate where the rate of corrosion increase as the inhibitor concentration decrease.