Thermochemistry of beryllium β-diketonates and Be–O bond energies

Abstract

Enthalpies of formation of the crystalline complexes of beryllium with 2,2,6,6-tetramethylheptane-3,5-dione (dpm), 1,1,1-trifluoropentane-2,4-dione (tfac), and tropolone, have been determined at 298.15 K by solution calorimetry: ΔH_f°[Be(dpm)₂](c)=–386.5 ± 2.0 kcal mol^–1, ΔH_f°[Be(tfac)₂](c)=–597.3 ± 2.0 kcal mol^–1, and ΔH_f°[Be(trop)₂](c)=–208.56 ± 0.42 kcal mol^–1. Gas phase enthalpies have been calculated and from these the Be–O bond energies have been derived.