Naslov
Copper(II) complexes with 3- and 6-hydroxypicolinic acid. Preparation, structural, spectroscopic and thermal study

Autori
Kukovec, Boris-Marko ; Popović, Zora ; Pavlović, Gordana

Izvornik
Acta Chimica Slovenica (1318-0207) 55 (2008), 4; 779-787

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Copper(II) complexes; 3- and 6-hydroxypicolinic acids; IR spectroscopy; Thermal analysis (TGA/DTA); Crystal structure; π -π stacking interactions

Sažetak
Copper(II) complexes of 3-hydroxypicolinic acid (3-OHpicH), namely [Cu(3-OHpic)2] (1), [Cu(3-OHpic)2(4-pic)] (2) and of 6-hydroxypicolinic acid (6-OHpicH), namely [Cu(6-OHpic)2(H2O)2] (3) and [Cu(6-OHpic)2(4-pic)2] (4) were prepared and characterized by IR spectroscopy and thermal analysis (TGA/DTA). Molecular and crystal structures of 2 and 4 were determined by X-ray crystal structure analysis. Complexes 1 and 3 were prepared by reaction of copper(II) sulfate pentahydrate with 3-hydroxypicolinic and 6-hydroxypicolinic acid, respectively, in aqueous solution, while 2 and 4 were prepared by recrystallization of 1 and 3 from 4-picoline solution. Structure analysis revealed square-pyramidal copper(II) coordination in 2. Copper(II) ion is coordinated by two 3-OHpic ligands in the basal plane of square pyramid and by 4-picoline molecule in the axial position in the structure of 2. In the structure of 4, copper(II) is coordinated by two 6-OHpic ligands in the equatorial plane and by two 4-picoline molecules in the axial positions, leading to a distorted 4+2 octahedral coordination. The crystal packings of both 2 and 4 are dominated by intermolecular C-H...O hydrogen contacts and π -π stacking interactions which form a complex three-dimensional supramolecular architectures.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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