The heat stabilities of trivalent metal 8-quinolinol chelates in inert atmospheres

The thermal stabilities of Al, Ga, In, Cr and Fe oxinates have been studied by thermogravimetry, differential thermal analysis, thermomanometric analysis and by a sealed tube extraction technique. The order of decreasing heat stability for the anhydrous chelates is Al>Cr~Ga>In>Fe. The compounds decompose with the evolution of hydrogen and the formation of large amounts of carbonaceous residue. The Al, Cr, Ga, and In oxinates can be melted without major decomposition when heated rapidly.