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Synthesis, Characterization and Stability Constants of Polynuclear Metal Complexes

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Abstract

Unsymmetric tridentate ligands, 4-methyl-2,6-di(4-methyliminomethyl)phenol (HL1), 4-(t-butyl)-2,6-di(4-methylphenyliminomethyl)phenol (HL2), 2,6-di(4-bromophenyliminomethyl)-4-methylphenol (HL3), 2,6-di(4-bromophenyliminomethyl)-4-(t-butyl)phenol (HL4), 2,6-di(4-hydroxyphenyliminomethyl)-4-methylphenol (HL5) and 4-(t-butyl)-2,6-di(4-hydroxyphenyliminomethyl)phenol (HL6), and their binuclear CuII, CoII and NiII complexes were synthesized and characterized by elemental analysis, FT-IR, u.v.-vis spectrometry magnetic moments, 1H(13C)-n.m.r. and mass spectral data. Also, the electrical conductivities of the complexes have been measured using 10-3 M solutions in MeCN. The complexes are weak electrolytes. In the electronic spectra of the complexes of the HL1-HL6 ligands, the 480-410 nm band has been determined as the charge-transfer band. While the HL5 and HL6 ligands have five potential donor atoms, other ligands have only three. Protonation constants of the ligands have been studied in dioxan-water mixtures. In addition, the antimicrobial properties of the ligands and their metal complexes have been studied:Bacillus megaterium, Micrococcus luteus, Corynebavterium xenosis, Enterococcus faecalis, bacteria and Saccoramyces cerevisia, yeast. The keto-enol tautomeric equilibria of the ligands have been investigated in polar and non-polar solvents.

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Authors and Affiliations

  1. Faculty of Science and Arts, Department of Chemistry, University of Kahramanmaraş S¨tç¨ İmam, 46100, Kahramanmaraş, Turkey

    Mustafa Dolaz, Mehmet Tümer & Metin Diğrak

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  1. Mustafa Dolaz
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  2. Mehmet Tümer
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  3. Metin Diğrak
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Dolaz, M., Tümer, M. & Diğrak, M. Synthesis, Characterization and Stability Constants of Polynuclear Metal Complexes. Transition Metal Chemistry 29, 528–536 (2004). https://doi.org/10.1023/B:TMCH.0000037520.05914.66

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