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    Öğe
    Raman, FT-IR, NMR spectroscopic data and antimicrobial activity of bis[?2-(benzimidazol-2-yl)-2-ethanethiolato-N,S,S-chloro-palladium(II)] dimer, [(?2-CH2CH2NHNCC6H4)PdCl]2•C2H5OH complex
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2007) Aghatabay, Naz M.; Somer, M.; Senel, M.; Dulger, B.; Gucin, F.
    The 1,6-bis(benzimidazol-2-yl)-3,4-dithiahexane (1) ligand and its palladium(H) chloride complex [(mu(2)-SCH2CH2NHNCC6H4)PdCl](2) center dot C2H5 OH (2) have been synthesised and characterised by spectroscopical methods. The crystal structure of the triclinic title compound (P-1 (no. 2), a = 879.6(l) pm, b = 984.4(l) pm, c = 1471.8(2) pm; a = 94.330(6)degrees, beta = 98.546(6)degrees, gamma = 99.258(7)degrees, Z = 2) was solved from X-ray single crystal diffraction data. In the binuclear complex, each palladium atom is coordinated in a slightly distorted square-planar arrangement by one nitrogen, two bridging sulphurs and one terminal chlorine atom. Molar conductivity, FT-Raman, FT-IR (mid-i.r., far-i.r.), H-1 and C-13 NMR spectra of the complex (2) have been recorded and show a good accordance with the square-planar geometry. The antimicrobial and antifungal activities of palladium(II) chloride, free ligand, its hydrochloride salt and the complex were evaluated using the disk diffusion method in dimethyl sulfoxide (DMSO) as well as the minimal inhibitory concentration (MIC) the dilution method, against 10 bacteria and five yeast cultures. The results for the antibacterial from the disk diffusion method were assessed in side-by-side comparison with those for penicillin-g, ampicillin, cefotaxime, vancomycin, ofloxacin and tetracycline. Antifungal activities were referenced with nystatin, ketaconazole, and clotrimazole, commercial antifungal agents. The data from the dilution procedure were compared with gentamycin as antibacterial and nystatin as antifungal agent, respectively. In most cases, the compounds tested showed broad-spectrum (Gram positive and Gram negative) activities that were comparatively more active, or as potent as referenced pharmaceutical agents. The palladium complex has the potential to generate new kind of metabolites by displaying high affinities for most of the receptors compared with palladium chloride, free ligand and its hydrochloride salt. (c) 2007 Elsevier Masson SAS. All rights reserved.
  • [ X ]
    Öğe
    Synthesis, characterization and antimicrobial activity of Fe(II), Zn(II), Cd(II) and Hg(II) complexes with 2,6-bis(benzimidazol-2-yl) pyridine ligand
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2007) Aghatabay, Naz M.; Neshat, A.; Karabiyik, T.; Somer, M.; Haciu, D.; Dulger, B.
    2,6-Bis(benzimidazol-2-yl)pyridine (L) ligand and complexes [M(L)Cl-2] and [Fe(L)(2)](ClO4)(2) (M = Zn, Cd, Hg) have been synthesized. The,geometries of the [M(L)Cl-2] complexes were derived from theoretical calculation in DGauss/DFT level (DZVP basis set) on CACHE. The central M(II) ion is penta-coordinated and surrounded by N3Cl2 environment, adopting a distorted trigonal bipyramidal geometry. The ligand is tridentate, via three nitrogen atoms to metal centre and two chloride ions lie on each side of the distorted benzimidazole ring. In the [Fe(L)21 (ClO4)(2) complex, the central Fe(H) ion is surrounded by two (3N) units, adopting a octahedral geometry. The elemental analysis, molecular conductivity, FT-Raman, FT-IR (mid-, far-IR), H-1, and C-13 NMR were reported. The antimicrobial activities of the free ligand, its hydrochloride salt, and the complexes were evaluated using the disk diffusion method in dimethyl sulfoxide (DMSO) as well as the minimal inhibitory concentration (MIC) dilution method, against 10 bacteria and the results compared with that for gentamycin. Antifungal activities were reported for Candida albicans, Khtyveromyces fragilis, Rhodotorula rubra, Debaryomyces hansenii, Hanseniaspora guilliemondii, and the results were referenced against nystatin, ketaconazole, and clotrimazole antifungal agents. In most cases, the compounds tested showed broad-spectrum (Gram positive and Gram negative bacteria) activities that were either more effective than or as potent as the references. The binding of two most biologically effective compounds of zinc and mercury to calf thymus DNA has also been investigated by absorption spectra. (c) 2006 Elsevier Masson SAS. All rights reserved.