Add time:07/17/2019         Source:sciencedirect.com

Ionization and appearance potentials determined with a time-of-flight mass spectrometer are reported for the principal positive ions in the mass spectra of dimethylzinc, trimethylaluminum, and trimethylantimony. The heats of formation, deduced by the application of the experimentally determined energetics and additional thermochemical data, have been listed for the principal positive ions of the three metal alkyls. The observed ionization potentials for Zn(CH3)2 (8.86±0.15 eV), Al(CH3)3 (9.09±0.26 eV), and Sb(CH3)3 (8.04±0.16 eV) are compared to the ionization potentials reported previously for methyl-substituted metal compounds. Additionally, the ionization potentials of the following radicals have been estimated: Zn(CH3) ⋍ 9.2 eV; Al(CH3)2 ⋍ 6.6 eV; AlCH3 ⋍ 7.8 eV; Sb(CH3)2 ⋍ 7.7 eV; and SbCH3 ⋍ 9.4 eV.

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