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Syntheses and spectrothermal studies of triethanolamine complexes of Co(II), Ni(II), Cu(II) and Cd(II) squarates

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 a...

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Published in:Journal of thermal analysis and calorimetry 2007-07, Vol.89 (1), p.261-265
Main Authors: YESILEL, O. Z, OLMEZ, H
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description 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.
doi_str_mv 10.1007/s10973-005-7477-y
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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&gt;Co(II), 230°C&gt;Cu(II), 226°C&gt;Cu(II), 170°C in static air atmosphere. The final decomposition products — the respective metal oxides — were identified by FTIR spectroscopy.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1007/s10973-005-7477-y</doi><tpages>5</tpages></addata></record>
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1588-2926
1572-8943
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subjects Cadmium compounds
Chemistry
Coordination compounds
Copper
Decomposition
Dehydration
Differential thermal analysis
Exact sciences and technology
Infrared spectroscopy
Inorganic chemistry and origins of life
Magnetic permeability
Metal oxides
Nickel
Preparations and properties
Spectrum analysis
Thermal decomposition
Thermal stability
Triethanolamine
title Syntheses and spectrothermal studies of triethanolamine complexes of Co(II), Ni(II), Cu(II) and Cd(II) squarates
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