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Copper(II) and cobalt(II) hydroxypyridinecarboxylates: Synthesis, crystal structures, spectral and magnetic properties

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Abstract

Synthesis and characterization of six copper(II) and cobalt(II) octahedral complexes [M(6-OHpic)2(H2O)2] (6-OHpic is 6-hydroxypicolinato), [M(2-OHnic)2(H2O)2] (2-OHnic is 2-hydroxynicotinato), [Cu(6-OHnic)2(H2O)2] (6-OHnic is 6-hydroxynicotinato) as well as [Co(H2O)6](6-OHnic)2 are reported. Their characterization was carried out using elemental analysis, infrared, and magnetic measurements. Based on IR spectra, N,O-coordination of 6-OHpic (via the oxygen atom of the carboxyl group and the nitrogen atom of the pyridine ring), O,O-asymmetrically chelating coordination of the carboxyl groups as well as ionic coordination of 6-OHnic and chelating O,O-coordination (through the oxygen atom of the carboxyl group and the oxygen atom of the amide group) of keto(amide) tautomer of 2-OHnic were supposed. Moreover, crystal structures of 2-OHnicH and the complex [Co(2-OHnic)2(H2O)2]) were determined by X-ray single crystal structure analysis. The system of hydrogen bonds predominantly stabilizes the keto(amide) tautomer of both 2-hydroxynicotinic acid and 2-OHnic anion in the cobalt(II) complex. Intermolecular hydrogen bonds (between the oxygen atom of the amide group and the hydrogen atom of the NH group) interconnect two neighbouring molecules of 2-OHnicH forming dimers. Cobalt(II) in complex [Co(2-OHnic)2(H2O)2] has nearly a regular compressed tetragonal bipyramidal arrangement.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Natural Sciences, University of St. Cyril and Methodius, 917 01, Trnava, Slovakia

    Jozef Miklovič & Ján Titiš

  2. Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovakia

    Peter Segľa, Dušan Mikloš & Milan Melník

  3. Department of Inorganic Chemistry, Palacký University, Křížkovského 10, 77147, Olomouc, Czech Republic

    Radovan Herchel

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  1. Jozef Miklovič
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  2. Peter Segľa
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  3. Dušan Mikloš
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  4. Ján Titiš
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  5. Radovan Herchel
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  6. Milan Melník
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Correspondence to Jozef Miklovič.

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Miklovič, J., Segľa, P., Mikloš, D. et al. Copper(II) and cobalt(II) hydroxypyridinecarboxylates: Synthesis, crystal structures, spectral and magnetic properties. Chem. Pap. 62, 464–471 (2008). https://doi.org/10.2478/s11696-008-0056-5

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