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

The complexes of trivalent gallium, indium and thallium with trioctylamine (TOA, R3N) and trioctylmethylammonium chloride (TOMAC, R3R'NCl) were prepared by drying in vacuum the organic extracts from aqueous solutions containing the chlorides of their metals with TOA and TOMAC in benzene. 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-ray 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. (author)