Heterophase synthesis and standard enthalpies of formation of metal acetylacetonates

Vaporization of Mn(acac)₃ has been studied by mass spectrometry on a quadrupole mass spectrometer with direct insertion probe, which was not previously used for these purposes. The enthalpy of sublimation of Mn(acac)₃ was calculated to be 130.5 ± 4.0 kJ/mol. Heterophase interactions in the [M-Mn(acac)₃] system were studied directly during the mass spectral experiment (in situ method). The reaction products were judged from the mass spectra of the gas phase. The enthalpies of formation in the gas phase Δ _f H _gas ^T of Pb, In, and Ga acetylacetonates were estimated to be −654, −1057, and −1035 kJ/mol, respectively.