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    Öğe
    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.
  • [ X ]
    Öğe
    Synthesis, structural characterization and antimicrobial activity of Schiff bases and benzimidazole derivatives and their complexes with CoCl2, PdCl2, CuCl2 and ZnCl2
    (Elsevier, 2021) Alterhoni, Elham; Tavman, Aydin; Hacioglu, Mayram; Sahin, Onur; Tan, A. Seher Birteksoz
    In this study, new Schiff bases (H2L1 and H2L2) and benzimidazolylphenol derivatives (HL3 - HL5) derived from 5-chlorosalicylaldehyde and appropriate aminophenol and o-phenylenediamine derivatives including 4-methyl/4,5-dimethyl/4-chloro-5-nitro groups were synthesized and characterized. CoCl2, PdCl2, CuCl2 and ZnCl2 complexes of the ligands were synthesized and characterized by using elemental analysis, molar conductivity, magnetic moment, FT-IR and NMR spectroscopy. In addition, the crystal structure of H2L1 and [Pd(L-1)(CH3CN)]center dot H2O were determined by X-ray diffraction spectroscopy. Keto-enol tautomerism is observed in the Schiff base compounds according to spectral data. Antimicrobial activities of the compounds were tested toward six bacteria and three fungi. Some metal complexes (e.g. Co(II) complexes of the benzimidazole derivatives) showed higher activity towards the test microorganisms than the ligands. In addition, it is observed that the Co(II) complexes show in a wide range antimicrobial activity compared to the other complexes. (C) 2020 Elsevier B.V. All rights reserved.