The heat of formation of aluminium acetylacetonate

Abstract

A number of reactions pertaining to the heat of formation of aluminium acetylacetonate have been measured in 50%(by vol.) dioxan–water solution, and enthalpy changes for the following processes (A = acetylacetonate) have been obtained. AlCl₃(solv.)+ 3NaA (solv.)= AlA₃(solv.)+ 3NaCl (solv)ΔH=–3·894 kcal./mole, Al (g)+ 3HA(enol)(g)= AlA₃(g)+ 3/2 H₂(g)ΔH_chel.=–239·97 kcal./mole, Al (c)+ 15C (c)+ 10·5H₂(g)+ 3O₂(g)= Al(C₅H₇O₂)₃(c)ΔH_f°=–427·59 kcal./mole, Al (g)+ 3C₅H₇O₂·(g)= Al(C₅H₇O₂)₃(g)ΔH=–398·85 kcal./mole

From the heat of formation of aluminium acetylacetonate in the vapour state, the aluminium–oxygen bond energy is derived; D(Al–O) at 25°= 66 kcal./mole.