Thermal and spectroscopic investigations of new lanthanide complexes with 1,2,4-benzenetricarboxylic acid |
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Authors: | R ?yszczek |
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Institution: | (1) Department of General and Coordination Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, M. C. Skłodowskiej Sq. 2, 20-031 Lublin, Poland |
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Abstract: | The new 1,2,4-benzenetricarboxylates of lanthanide(III) of the formula Ln(btc)·nH2O, where btc is 1,2,4-benzenetricarboxylate; Ln is La-Lu, and n=2 for Ce; n=3 for La, Yb, Lu; and n=4 for Pr-Tm were prepared and characterized by elemental analysis, infrared spectra and X-ray diffraction patterns. Polycrystalline
complexes are isotructural in the two groups: La-Tm and Yb, Lu. IR spectra of the complexes show that all carboxylate groups
from 1,2,4-benzentricarboxylate ligands are engaged in coordination of lanthanide atoms.
The thermal analysis of the investigated complexes in air atmosphere was carried out by means of simultaneous TG-DTA technique.
The complexes are stable up to about 30°C but further heating leads to stepwise dehydration. Next, anhydrous complexes decompose
to corresponding oxides. The combined TG-FTIR technique was employed to study of decomposition pathway of the investigated
complexes. |
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Keywords: | 1 2 4-benzenetricarboxylic acid dehydration lanthanide complexes TG-DTA TG-FTIR |
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