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1 Polish Journal of Chemistry

1 2005

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Spectroscopic and Thermal Studies of Magnesium(II), Barium(II), Zinc(II), Copper(II), Lanthanum(III) and Aluminium(III) Comlexes with 3-Phenyl-1-methylpyrazolo[3,4-b}quinolino-6-carboxylic Acid

Kowalczyk B., Brągiel P., Kapuśniak J., Giełzak-Koćwin K., Tsvirko M., Siemion P., Jarosz B.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1721-1730

Magnesium(II), barium(II), zinc(II), copper(II), lanthanum(III) and aluminium(III) complexes with 3-phenyl-1-methylpyrazolo[3,4-b]quinlino-6-carboxylic acid (HPQ) were stud ied by IR and EPR methods, TG-DSC ther mal analysis, powder X-ray method, absorption and fluorescence spectroscopy. The IR spectra suggest that the carboxylate ligand acts as mono- or bidentate species. EPR spectra indi ate the dimerization of copper(II) complex. During thermal decomposition the hy drated complexes lose all the crystallization and coordination water molecules and decompose gradually to oxides, and to BaCO3 in the case of barium(II) complex. The powder fluorescence spectra in dicated the differences in emission of ligand and zinc(II), magnesium(II), aluminium(III) and copper(II) complexes.