Synthesis, Characterization and Redox Properties of Three New vic-dioximes and their Nickel(II) Metal Complexes

Preparation of Cu(II), Ni(II), Ti(IV), VO(IV), and Zn(II) Metal Complexes Derived from Novel vic-Dioxime and Investigation of Their Antioxidant and Antibacterial Activities

In this work, novel vic-dioxime ligand (LH₂ ) containing bound to the N₄ -oxime core moiety and its complexes with Cu(II), Ni(II), Ti(IV), VO(IV), and Zn(II) salts have been studied. The structure of the ligand and its complexes were successfully synthesized and characterized using NMR (¹ H and ¹³ C), LC/MS/MS spectrometer, FT-IR and UV/VIS spectroscopy, melting point, and magnetic susceptibility measurements. Vic-dioxime ligand (LH₂ ) (1) and its metal complexes ([Cu(LH)₂ ] (2), [Ni(LH)₂ ] (3), [Ti(LH)₂ ]Cl₂ (4), [VO(LH)₂ ] (5), and [Zn(LH)₂ ] (6), respectively) were tested for them in-vitro antibacterial and antioxidant activities. According to the metal chelating results of the study, it was determined that compounds (1), (2), (3), and (6) showed very good activity, and especially compound (2), had a stronger metal chelating capacity due to ligand dissociation from the synthesized metal complexes, which then would chelate Fe(II) in the experimental setting. When microorganisms were evaluated in terms of the % viability effect, it was observed that all compounds had activity against C. Albicans and S. Cerevisiae at rates similar to antibiotics.

Preparation, spectroscopic investigation and antiproliferative capacity of new metal complexes of (3E)-2-(hydroxyimino)-N-P-Tolyl-3-(P-tolylimino) butanamide

Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Sr(II), Hg(II), Tl(I), UO(2)(II) and ZrO(II) complexes of (3E)-2-(hydroxyimino)-N-P-Tolyl-3-(P-tolylimino) butanamide have been prepared and characterized by elemental analyses, IR, UV-Vis spectra, magnetic moments, conductances, (1)H NMR and mass spectra (ligand and its Zn(II) complex), thermal analyses (DTA and TGA) and ESR measurements. The IR data show that, the ligand behaves as monobasic bidentate or neutral bidentate. Molar conductances in DMF indicate that, the complexes are non-electrolytes. ESR spectra of solid Cu(II) complexes at room temperature show axial type (d(x)(2-)(y)(2)) with covalent bond character in an octahedral environment. Complexes showed inhibitory activity against hepatocellular carcinoma (HepG-2 cell line).