Abstract

KAFI-AHMADI, Leila  and  MARJANI, Ahmad Poursattar. Mononuclear Schiff Base Complexes Derived from 5-Azophenylsalicylaldehyde with Co(II), Ni(II) Ions: Synthesis, Characterization, Electrochemical Study and Antibacterial Properties. S.Afr.j.chem. (Online) [online]. 2019, vol.72, pp.101-107. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2019/v72a13.

In the present research, 1,2-di[N-2-phenylthio-5-azophenylsalicylidene]ethane (H₂L¹, 1,3-di[N-2-phenylthio-5-azophenylsali-cylidene]propane(H₂L²) and 1,4-di[N-2-phenylthio-5-azophenylsalicylidene]butane (H₂L³) were synthesized. ML¹,ML² and ML³ complexes were prepared through the reaction of H₂L¹,H₂L² and H₂L³ with Ni(II) and Co(II) acetate salts. The prepared ligands and their complexes were characterized with FT-IR, ¹H-NMR, elemental analysis, conductivity and magnetic measurements, ESI-mass, UV-Vis spectroscopy and cyclic voltammetry. The complexes had monomeric structure according to the mass spectral data. All of the complexes had a six-coordinated octahedral geometry. The electrochemical behavior of the ligands, Ni(II) and Co(II) complexes was investigated by CV in DMF under argon atmosphere. The results show that the coordination of Ni(II) causes the ligands to be deactivated. The voltammogram of Co(II) complexes shows that the reduction of CoL¹ is harder than CoL³ and CoL² is inactive. Their antibacterial activity was investigated and the complexes exhibited better antibacterial activity than the free ligands against selective bacteria.

Keywords : Schiff base complexes; 5-azophenylsalicylaldehyde; electrochemical study; antibacterial properties.

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