Abstract
Solid-state Ln-Bz compounds, where Ln stands for trivalent lanthanides and Bz is benzoate have been synthesized. Simultaneous thermogravimetric and differential thermal analysis in a CO2 atmosphere were used to study the thermal decomposition of these compounds
Highlights
Benzoic acid and some of its derivatives are used as conservant, catalyst polymers precursors, in pharmaceutical industries, etc
A survey of literature shows that the complexes of rare earth elements with benzoic acid and some of their derivatives have been investigated in aqueous solutions [1,2,3,4,5] and in solid state [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]
The preparation of the solid state compounds of trivalent lanthanides and yttrium (III) with Bz, as well as, the determination of hydration water, metallic ions and ligand contents, the same procedure were used as previously described in Ref. 25
Summary
Benzoic acid and some of its derivatives are used as conservant, catalyst polymers precursors, in pharmaceutical industries, etc. After their dehydration the anhydrous compounds are stable up to 350 oC, and the endothermic peaks at 250 oC (La), 245 oC (Pr) and 240 oC (Nd) are atributed to the reversible crystalline phase transition, in agreement with the thermal decomposition of these compounds in an air atmosphere [25]. The first one corresponding to endothermic peaks is attributed to thermal decomposition of these compounds and tests with hydrochloric acid solution on samples heated up to the final temperature of this step, showed in all cases, the presence of carbonaceous residue and evolution of CO2, indicating the formation of carbonate or a derivative of carbonate, as intermediate.
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