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Thermal behaviour and vibrational spectra of (NH4)3Ga(C2O4)3 · 3H2O and (NH4)3Al(C2O4)3 · 3H2O

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Abstract

The IR and Raman spectra and the thermal behaviour of the isomorphous compounds (NH4)3Ga(C2O4)3·3H2O and (NH4)3Al(C2O4)3·3H2O were investigated. Detailed stoichiometries, sustained by TG, DTA and IR spectroscopic analyses, were found in both cases. Different results, associated with the different polarizing powers of the metal cations, were obtained. The first evidence was found of the formation of basic gallium carbonates.

Zusammenfassung

Die IR- und Raman-Spektren der isomorphen Verbindungen (NH4)3Ga(C2O4)3·3H2O und (NH4)3Al(C2O4)3·3H2O wurden aufgenommen. Das thermische Verhalten dieser Verbindungen wurde untersucht. Durch TG, DTA und IR-Spektroskopie gestützte stöchiometrische Zusammenhänge wurden in beiden Fällen in Einzelheiten geklärt. Abhängig von der Polarisationswirkung der Metallkationen wurden unterschiedliche Ergebnisse erhalten. Die Bildung von basischem Galliumkarbonat wurde erstmals bewiesen.

Резюме

Исследовано термиче ское поведение, ИК спе ктры и спектры комбинацио нного рассеяния двух изомо рфных соединений (NH4)3Ga(C2O4)3 · 3H2O и (NH4)3Al(C2O4)3 · 3H2O. С помощью ТГ, ДТА и ИК спе ктроскопии установл ен стехиометрический с остав обоих соединений. Различны е результаты, получен ные для двух соединений, обусловл ены различной поляризуемостью кат ионов металла. Впервы е найдено доказательство обра зования основного карбоната галлия.

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Authors and Affiliations

  1. Química Inorgánica, Facultad de Ciencias Exactas, U.N.L.P., Calles 47 Y 115, 1900, LA Plata, Argentina

    I. L. Botto, E. J. Baran & A. C. Garcia

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  1. I. L. Botto
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  2. E. J. Baran
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  3. A. C. Garcia
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Additional information

This work was supported by CONICET (Programa QUINOR) and CICPBA. The authors wish to thank Mr. R. Garcia for technical assistance.

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Botto, I.L., Baran, E.J. & Garcia, A.C. Thermal behaviour and vibrational spectra of (NH4)3Ga(C2O4)3 · 3H2O and (NH4)3Al(C2O4)3 · 3H2O. Journal of Thermal Analysis 31, 1301–1308 (1986). https://doi.org/10.1007/BF01914642

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  • DOI: https://doi.org/10.1007/BF01914642

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