Synthesis, characterization and thermal behavior of some trivalent lanthanide 4-amino-benzenesulfonate salts

The lanthanide 4-amino-benzenesulfonate salts (or sulfanilates) were obtained by the reaction of lanthanide carbonates (La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ and Gd 3+ ) and 4-amino-benzenesulfonic (or sulfanilic) acid in aqueous solution. Simultaneous thermogravimetry, differential thermal...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2017-12, Vol.130 (3), p.2185-2190
Main Authors: Matias, Fabrício Rossi Marques, da Silva, Vivian Martins F., Nunes, Ronaldo Spezia, Luiz, José Marques
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Calorimetry
Carbonates
Cerium
Chemistry
Chemistry and Materials Science
Decomposition
Dehydration
Differential scanning calorimetry
Diffraction
Endothermic reactions
Enthalpy
Fourier transforms
Infrared analysis
Infrared spectroscopy
Inorganic Chemistry
Measurement Science and Instrumentation
Physical Chemistry
Polymer Sciences
Rare earth metal compounds
Rare earth metals
Thermal analysis
Thermal decomposition
Thermodynamic properties
Thermogravimetry
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Summary:The lanthanide 4-amino-benzenesulfonate salts (or sulfanilates) were obtained by the reaction of lanthanide carbonates (La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ and Gd 3+ ) and 4-amino-benzenesulfonic (or sulfanilic) acid in aqueous solution. Simultaneous thermogravimetry, differential thermal analysis and differential scanning calorimetry, elemental analysis, X-ray powder diffractometry and infrared spectroscopy (FTIR) were used to characterize and to study the thermal behavior of these compounds. The general formula could be established as LnL 3 · n H 2 O, where Ln represents trivalent lanthanide ions (La–Gd), L is the 4-amino-benzenesulfonate anion (NH 2 C 6 H 4 SO 3 − ) and n  = 8 (La–Gd) and n  = 7 only for Ce. The thermal behavior indicates that dehydration occurs in a single step up to 443 K, characterized by an endothermic peak, and the enthalpy of dehydration was evaluated by DSC. Thermal decomposition takes place above 523 K producing a stable intermediate Ln 2 O 2 SO 4 characterized by X- ray diffraction, which in the sequence decomposed to the respective oxides. For the La 3+ , Nd 3+ and Pr 3+ sulfanilates, the residual oxide formation occurs only after 1573 K.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-017-6581-0