Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 90, Issue 2, Pages 533-539Publisher
SPRINGER
DOI: 10.1007/s10973-006-7734-8
Keywords
1,2,4-benzenetricarboxylic acid; dehydration; lanthanide complexes; TG-DTA; TG-FTIR
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The new 1,2,4-benzenetricarboxylates of lanthanide(III) of the formula Ln(btc)center dot nH(2)O, 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-benzenetricarboxylate 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 degrees 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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