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Síntese, caracterização e comportamento térmico de amidossulfonatos de terras raras Synthesis, characterization and thermal behavior of rare earth amidosulfonates

Author(s): José Marques Luiz | Ronaldo Spezia Nunes | Jivaldo do Rosário Matos

Journal: Química Nova
ISSN 0100-4042

Volume: 36;
Issue: 3;
Start page: 426;
Date: 2013;
Original page

Keywords: amidosulfonates | lanthanides | thermogravimetry

Hydrated compounds prepared in aqueous solution by reaction between amidosulfonic acid [H3NSO3] and suspensions of rare earth hydroxycarbonates [Ln2(OH)x(CO3)y.zH2O] were characterized by elemental analysis (% Ln, % N and % H), infrared spectroscopy (FTIR) and thermogravimetry (TG). The compounds presented the stoichiometry Ln(NH2SO3)3.xH2O (where x = 1, 5, 2.0 or 3.0). The IR spectra showed absorptions characteristic of H2O molecules and NH2SO3 groups. Degree of hydration, thermal decomposition steps and formation of stable intermediates of the type [Ln2(SO4)3] and (Ln2O2SO4), besides formation of their oxides, was determined by thermogravimetry.
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