Synthesis and characterization of some novel cadmium(II) complexes with 3-hydroxypicolinic acid (3-OHpicH): Crystal and molecular structures of [CdI(3-OHpic)(3-OHpicH)(H2O)]2, [Cd(3-OHpic)2(H2O)2] and [Cd(3-OHpic)2]n |
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| Authors: | Boris-Marko Kukovec Zora Popovi? Gordana Pavlovi? Marijana Vinkovi? Dra?en Viki?-Topi? |
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| Institution: | 1. Laboratory of General and Inorganic Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia;2. Laboratory of General Chemistry, Department of Applied Chemistry, Faculty of Textile Technology, University of Zagreb, Prilaz baruna Filipovi?a 28a, HR-10000 Zagreb, Croatia;3. NMR Centre, Ru?er Boškovi? Institute, Bijeni?ka cesta 54, HR-10000 Zagreb, Croatia |
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| Abstract: | Cadmium(II) complexes of 3-hydroxypicolinic acid, namely CdI(3-OHpic)(3-OHpicH)(H2O)]2 (1), Cd(3-OHpic)2(H2O)2] (2) and Cd(3-OHpic)2]n (3) were prepared and characterized by spectroscopic methods (IR, NMR) and their molecular and crystal structures were determined by X-ray crystal structure analysis. Complexes 1 and 2 were prepared in similar reaction conditions using different cadmium(II) salts: cadmium(II) iodide and cadmium(II) acetate dihydrate, respectively, while 3 was prepared by recrystallization of 2 from N,N-dimethylformamide solution. Various coordination modes of 3-OHpicH in 1–3 were established in the solid state: bidentate N,O-chelated mode in 1 and 2, monodentate mode through the carboxylate O atom from zwitterionic ligand in 1 and bidentate N,O-chelated and bridging mode in 3. In the DMF solution of all prepared complexes, only monodentate mode of 3-OHpicH binding to cadmium(II) through the carboxylate O atom was established by 1H, 13C, 15N and 113Cd NMR spectroscopy. |
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| Keywords: | Cadmium(II) complexes 3-Hydroxypicolinic acid IR spectroscopy 1H 13C 15N 113Cd NMR spectroscopy Crystal structures |
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