Syntheses and spectrothermal studies of triethanolamine complexes of Co(II), Ni(II), Cu(II) and Cd(II) squarates |
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Authors: | O Z Yeşilel H Ölmez |
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Institution: | (1) Department of Chemistry, Faculty of Arts and Sciences Eskişehir Osmangazi University, 26480 Eskişehir, Turkey;(2) Department of Chemistry, Faculty of Arts and Sciences Ondokuz Mayıs University, 55139 Kurupelit-Samsun, Turkey |
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Abstract: | The triethanolamine complexes, M(tea)2]sq·nH2O, (n=2 for Co(II), n=0 for Ni(II), Cu(II) and n=1 for Cd(II), tea=triethanolamine, sq2−=squarate), have been synthesized and characterized by elemental analyses, magnetic susceptibility and conductivity measurements,
UV-Vis and IR spectra, and thermal analyses techniques (TG, DTG and DTA). The Co(II), Ni(II) and Cu(II) complexes possess
octahedral geometry, while the Cd(II) complex is monocapped trigonal prismatic geometry. Dianionic squarate behaves as a counter
ion in the complexes. The thermal decomposition of these complexes takes place in three stages: (i) dehydration, (ii) release of the tea ligands and (iii) burning of organic residue. On the basis of the first DTGmax of the decomposition, the thermal stability of the anhydrous complexes follows the order: Ni(II), 289°C>Co(II), 230°C>Cu(II),
226°C>Cu(II), 170°C in static air atmosphere. The final decomposition products — the respective metal oxides — were identified
by FTIR spectroscopy. |
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Keywords: | squaric acid thermal decomposition triethanolamine complexes |
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