Síntese, caracterização e comportamento térmico de amidossulfonatos de terras raras

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Data

2013-01-01

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Sociedade Brasileira de Química

Resumo

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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Palavras-chave

amidosulfonates, lanthanides, thermogravimetry

Como citar

Química Nova. Sociedade Brasileira de Química, v. 36, n. 3, p. 426-430, 2013.