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Synthesis and structure of cobalt(II) complexes with hydroxyl derivatives of pyridinecarboxylic acids: Conformation analysis of ligands in the solid state

✍ Scribed by Boris-Marko Kukovec; Zora Popović; Gordana Pavlović; Maša Rajić Linarić

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
529 KB
Volume
882
Category
Article
ISSN
0022-2860

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✦ Synopsis

Cobalt(II) complexes of 6-hydroxypicolinic acid (6-OHpicH), namely 2 (H 2 O) 2 ] (1) and 2 (4-pic) 2 ]AE4-pic (2), and of 2-hydroxynicotinic acid (2-OHnicH), [Co(2-OHnic) 2 (H 2 O) 2 ] (3) were prepared. The crystal structures of free 6-hydroxypicolinic acid monohydrate 6-OHpicHAEH 2 O (4), and the novel polymorph of 2-hydroxynicotinic acid 2-OHnicH (5) and complex 2 were determined by X-ray crystal structure analysis. All compounds were characterized by IR-spectroscopy and thermal methods (TGA/DSC) and data are in agreement with the structure analysis. It was established that 4 and 5 exist in solid state in keto tautomeric form. For 2, structure analysis revealed N,O-chelating mode of 6-hydroxypicolinic acid.

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