Transition metal complexes with pyrazole based ligands. Part 27. Structural and thermal characterization of cobalt(II) halide and pseudohalide complexes with 4-acetyl-3-amino-5-methylpyrazole
АуториLeovac, Vukadin M.
Tomić, Zoran D.
Szecsenyi, Katalin Meszaros
Jovanovic, Ljiljana S.
Joksović, Milan D.
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The crystal and molecular structures of four tetrahedral structurally similar [Co(aamp)(2)X-2] complexes (aamp = 4-acetyl-3-amino-5-methylpyrazole, X = Cl, Br, I and NCS) were determined by X-ray diffraction analysis and are discussed in detail. It was found that the different capacity of the ligand X (NCS vs. Cl, Br, I) for the formation of non-bonding contacts influence the mode of molecular association in the solid state. The complexes were characterized by UV-Vis spectroscopy. The first step of the thermal decomposition of the compounds was checked and is discussed in the view of the IR spectrum of the intermediate isolated from [Co(aamp)(2)Br-2] by the quasi-isothermal technique.
Кључне речи:cobalt(II) complexes / 4-acetyl-3-amino-5-methylpyrazole / crystal structure / electronic spectra / quasi-isothermal TA
Извор:Journal of the Serbian Chemical Society, 2007, 72, 12, 1281-1293
ISSN: 0352-5139 (print)