Enthalpies of combustion of tris-(acetylacetonato) derivatives of aluminium(III), gallium(III) and indium(III)

Abstract

The enthalpies of combustion of the following tris-(acetylacetonato) derivatives have been measured and the standard enthalpies of formation at 298.15 K derived. –ΔH^°_c/kJ mol^–1–ΔH^°_f/kJ mol^–1 Al(C₅H₇O₂)₃(c) 7948.4 ± 1.1 1793.3 ± 2.0, Ga(C₅H₇O₂)₃(c) 7963.0 ± 3.6 1476.0 ± 4.5, In(C₅H₇O₂)₃(c) 7961.1 ± 2.8 1405.7 ± 3.6. The mean metal—oxygen bond enthalpy contributions in these compounds have been assessed: D(Al—O) 215.6, D(Ga—O) 156.0, and D(In—O) 136.6 kJ mol^–1, and are in the expected sequence.