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Thermal decomposition of the solvent-extracted chloro complexes of trivalent gallium, indium and thallium with trioctylamine and trioctylmethylammonium chloride

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Abstract

The complexes of trivalent gallium, indium and thallium with trioctylamine (TOA, R3N) and trioctylmethylammonium chloride (TOMAC, R3R′NCl) were prepared by drying in vacuo the organic extracts from aqueous solutions containing the chlorides of their metals with TOA and TOMAC in benzene: R3NHGaCl4, (R3NH)2InCl5, R3NHTlCl4, R3R'NGaCl4, R3R'NInCl4 and R3RTlCl4. The prepared complexes were examined by TG and DTA under an atmosphere of nitrogen, and the products of their thermal decompositions, such as volatile matter and residues, were examined by gas chromatography, X-ay diffraction study and infrared spectrophotometry. It was found that the complexes of these trivalent metals with TOA and TOMAC decompose thermally to the chlorides (GaCl3, InCl3 and TlCl) through the cracking of alkyl groups.

Zusammenfassung

Komplexe von dreiwertigem Gallium, Indium und Thallium mit Trioctylamin (TOA, R3N) und Trioctylmcthylarnmonium-Hydrochlorid (TOMAC, R3R'NCl) wurden durch Trocknung der benzolischen Extrakte der die Metallchloride mit TOA bzw. TOMAC enthaltenden wässrigen Lösungen im Vakuum dargestellt: R3NHGaCl4, (R3NH)2InCl5, R3NHTlCl4, R3R'NGaCl4, R3R'NInCl4 und R3R'TlCl4. Die dargestellten Komplexe wurden durch TG und DTA in Stickstoffatmosphäre untersucht. Die Produkte der thermischen Zersetzung, flüchtige Substanzen und Rückstände, wurden gas-chromatographisch, röntgendiffraktometrisch und 1R-spektrophotometrisch untersucht. Es wurde festgestellt, daß die Komplexe dieser dreiwertigen Metalle sich thermisch durch Krackung der Alkylgruppen zu den Chloriden (GaCl3, InCl3 und TlCl3) zersetzen.

Резюме

Комплексы хлоридов т рехвалентных галлия, индия и таллия с триок тиламином (ТОА, R3N) и триоктилметил аммоний хлоридом (ТОМ АС, R3R′NCl) состава R3NHGaCl4, (R3NH)2InCl5, R3NHTlCl4, R3R′NGaCl4, R3R′NInCl4 и R3R′NTlCl4 бы ли получены высушиванием в вакуу ме органических экст рактов, полученных при совме стном экстрагировании хло ридов металлов с ТОА и ТОМАС в бензоле. Полученные к омплексы были изучены методами ТГ и ДТА в атмосфере азота, а продукты термического разлож ения анализировались газ овой хроматографией, рентгено-фазовым ана лизом и ИК спектромет рией. Установлено, что эти к омплексы разлагаютс я до хлоридов металлов (GaCl3, InCl3 и TlCl) c расщеплением алкиль ных групп.

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We wish to thank the Research and Development Laboratory, Swiss Aluminium Ltd., Neuhausen, Switzerland, for the gift of gallium metal, and the Koei Chemical Co. Ltd. for samples of TOA and TOMAC.

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Sato, T., Takahashi, T. Thermal decomposition of the solvent-extracted chloro complexes of trivalent gallium, indium and thallium with trioctylamine and trioctylmethylammonium chloride. Journal of Thermal Analysis 31, 653–666 (1986). https://doi.org/10.1007/BF01914243

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  • DOI: https://doi.org/10.1007/BF01914243

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