Abstract
The ionization energies and C 3H 5 + appearance energies for several C 3H 6 and C 4H 8 hydrocarbons have been measured by photoionization mass spectrometry. A 298 K heat of formation of 949.6±1.4 kJ mol −1, based on the stationary electron convention, is derived for the allyl cation in the gas phase; this results in a heat of formation for the allyl radical of 165.2±3.3 kJ mol −1. From corresponding measurements for the allyl halides, heats of formation at 298 K are obtained for 3-chloro-1-propene (−5.6 kJ mol −1), 3-bromo-1-propene (+47.7 kJ mo1 −1) and 3-iodo-1-propene (+99.5 kJ mol −1), together with values for the contributions of C-(C d)(H) 2(X) groups to heats of formation.
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