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    SPECTRAL CHARACTERIZATION AND ANTIBACTERIAL, ANTIFUNGAL, ANTIVIRAL ACTIVITY OF SALICYL BASED NEW SCHIFF BASES AND THEIR Co(II), Ni(II), Cu(II), Zn(II), AND Pd(II) COMPLEXES **
    (Editura Acad Romane, 2024) Pardaeva, Dildora; Tavman, Aydin; Gurbuz, Demet; Hacioglu, Mayram; Yilmaz, Fatima Nur; Sahin, Onur; Tan, A. Seher Birteksoz
    Two new salicyl based Schiff bases derived from 3,5-dichlorosalicylaldehyde and 4-(chloro/ tert - butyl)-2-aminophenols ( H 2 L 1 and H 2 L 2 ) and their complexes with cobalt(II), nickel(II), copper(II), zinc(II), and palladium(II), {[M( L n )(H 2 O)]center dot x H 2 O, M(II) = Co(II) ( n = 1, 2; x = 1), Ni(II) ( n = 1, x = 2; n = 2, x = 0), Cu(II) ( n = 1, 2; x = 0), Zn(II) ( n = 1, 2; x = 0); K[Pd( L n )Cl]; n = 1, 2}, were synthesized and characterized. The structural characteristics of the complexes were examined by means of elemental analysis, molar conductivity, magnetic moment, thermogravimetric analysis (TGA), UVvisible, FT -IR, and NMR spectroscopy. In addition, the crystal structures of H 2 L 1 and H 2 L 2 were determined by X-ray single diffraction measurements. All the complexes are non -electrolyte with 1:1 M:L ratio. Antibacterial and antifungal activity of the compounds was evaluated against six bacteria and three fungi. In general, all the compounds showed moderate antimicrobial activity. Some of the complexes exhibited higher activity towards some microorganisms than the ligands. Antiviral activity of the compounds was tested against Parainfluenza Type -2 virus. The fact that H 2 L 2 has a higher antiviral effect than H 2 L 1 can be evaluated as that the tert -butyl group promotes the antiviral effect.
  • [ X ]
    Öğe
    Synthesis, Characterization and Antimicrobial Activity of Schiff Bases Including Three Hydroxy Groups and Their CoCl2, PdCl2, CuCl2and ZnCl2Complexes
    (Wiley-V C H Verlag Gmbh, 2020) Alterhoni, Elham; Tavman, Aydin; Gurbuz, Demet; Hacioglu, Mayram; Cinarli, Adem; Sahin, Onur; Tan, A. Seher Birteksoz
    Four Schiff bases, (3/4/2/4)-{[(2-hydroxy-5-methylphenyl)imino]methyl}benzene-1,2/1,3/1,4/1,2-diols (H3L1-H3L4), derived from 2,3/2,4/2,5/3,4-dihydroxybenzaldehydes and 2-amino-4-methylphenol, and their CoCl2, PdCl2, CuCl(2)and ZnCl(2)complexes were synthesized and characterized. The structures of the complexes were suggested on the basis of elemental analysis, TGA, molar conductivity, magnetic moment, FT-IR, UV-vis and NMR spectroscopy. According to the analytical and spectral data, the ligandsH(3)L(1),H(3)L(2)andH(3)L(3)acted as tridentate, giving chelate structures in the complexes, via the C=N nitrogen and two phenolate oxygen atoms whereasH(3)L(4)acted as bidentate. In addition, the crystal structure ofH(3)L(1)was determined by X-ray diffraction. The spectral data show that there is keto-enol tautomerization in the ligands and keto form is dominant inH(3)L(1)andH(3)L(3)while enol form is inH(3)L(2)andH(3)L(4). Antimicrobial activities of the compounds were tested against six bacteria and three fungi. [Zn(H2L1)Cl].4H(2)O showed superior activity toward the fungiC. albicans,C. parapsilosisandC. tropicaliscompared toH(3)L(1)and the other compounds. Strong activity ofH(3)L(1),H(3)L(2)andH(3)L(3)was observed towardS. aureuswhereas they showed weak activity to the other microorganisms.