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Journal of Coordination Chemistry
Year: 2011  |  Volume: 64  |  Issue: 19  |  Page No.: 3353 - 3365

Synthesis, characterization, and biological evaluation of Cu(II) complexes with the proton transfer salt of 2,6-pyridinedicarboxylic acid and 2-amino-4-methylpyridine

Cengiz Yenikaya, Nurgun Buyukkidan, Musa Sari, Recep Kesli, Halil Ilkimen, Metin Bulbul and Orhan Buyukgungor    

Abstract: A proton transfer compound, (Hamp)+(Hdipic)- · 1.5H2O (1), and Cu(II) complexes, [Cu(dipic)(amp)(H2O)] · [Cu(dipic)(amp)] · H2O · CH3COOH (2) and [Cu(dipic)(amp)Cu(dipic)(amp)(H2O)Cu(dipic)(amp)(H2O)] · 3H2O (3), have been synthesized from 2,6-pyridinedicarboxylic acid (H2dipic) and 2-amino-4-methylpyridine (amp). They have been characterized by elemental, spectral (1H-NMR, IR, and UV-Vis), and thermal analyses. In addition, magnetic measurements and single crystal X-ray diffraction have been applied to 2 and 3. The crystal structure of 2 consists of two independent and different cationic sites with Cu2+ ions. Cu1 is four-coordinate in a distorted square planar geometry and Cu2 is five-coordinate in a distorted square pyramid. Compound 3 has three independent and different cationic sites of Cu2+ ions. Cu1 is four-coordinate in a distorted square planar geometry and Cu2 and Cu3 have five-coordinate, distorted square-pyramidal sites. Inhibitory effects of 1, 2, and 3 have been studied and compared with starting compounds (amp and H2dipic) on bacterial growth of Staphylococcus aureus and Escherichia coli cultures. Compounds 2 and 3 prevent bacterial growth although 1 has no effect. Compounds 2 and 3 are more effective than amp and H2dipic, at similar concentrations on preventing bacterial growth for both organisms.

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