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Thermal Decomposition of Lanthanum O-Hydroxybenzoate and O-Bromobenzoate | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 24, 2014, Pages 551-560 | ||
| Authors | ||
| Mustaffa .Taha; Abed Al- Kader. M.N; Hadi Hessen Jusim | ||
| Abstract | ||
| Abstract The conditions of thermal analysis of Lanthanum -O-Hydroxybenzoate and Lanthanum -O-Bromobenzoate were studied . The Hydrated complexes lose water of crystallization in two steps . Lanthanum -O-Hydroxybenzoate starts to lose water of crystallization between (60-230)oC , but Lanthanum -O-Bromobenzoate loses water of crystallization between (100-320)oC . The intermediate products La2O3(OHC6H4COO)5 and La2(BrC6H4COO)6 were obtained by heating the two complexes at(320-350)oC and (320-380)oC respectively . In the fourth step , anhydrous structures of the complexes decomposed in one step and then were transformed to La2O3 . These results are using TG,DTG,DTA,IR and (X – ray) diffraction techniques . DTA curves revealed exothermic peaks for the decomposition steps , but endothermic peaks were obtained from the dehydration of complexes . | ||
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