Photoionization of the C‐1-C‐4 monosubstituted alkyl benzenes: Thermochemistry of [C7H7]+ and [C8H9]+ formation
- 1 February 1979
- journal article
- research article
- Published by Wiley in Journal of Mass Spectrometry
- Vol. 14 (2) , 104-108
- https://doi.org/10.1002/oms.1210140209
Abstract
The appearance energies for the [C7H7]+ and [C8H9]+ fragment ions produced in the fragmentation of the C‐1C‐4 monosubstituted alkyl benzenes have been measured by photon impact. The mean heat of formation calculated for [C7H7]+ is 205.3 ± 1.9 kcal mol−1 which is consistent with a threshold tropylium structure. For [C8H9]+ the mean heat of formation is calculated to be 199.2 ± 1.3 kcal mol−1 which can be equated with either a methyl tropylium or α‐phenylethyl structure at threshold. Some evidence is provided for the existence of the α‐phenylethyl ion.Keywords
This publication has 15 references indexed in Scilit:
- A photoionization study of the [C7H8] ion formed from some monosubstituted alkyl benzenesJournal of Mass Spectrometry, 1978
- Detection and investigation of allyl and benzyl radicals by photoelectron spectroscopyJournal of the American Chemical Society, 1978
- Gaseous ions. 5. Calculated (MINDO/3) properties of monosubstituted tropylium ions and benzyl cationsJournal of the American Chemical Society, 1977
- An ion cyclotron resonance study of the structures of C7H7+ ionsJournal of the American Chemical Society, 1977
- Threshold photoionization and dissociation of toluene and cycloheptatrieneJournal of the American Chemical Society, 1977
- Collisional activation and metastable ion characteristics. 53. Thirteen stable isomers of gaseous C8H9+ cationsJournal of the American Chemical Society, 1977
- Gaseous ions. 2. MINDO/3 study of the rearrangements of toluene and cycloheptatriene molecular ions and the formation of tropyliumJournal of the American Chemical Society, 1977
- Electron-impact-induced rearrangements of organic ions VIUnimolecular reactions of isomeric[C8H9]+ionsJournal of Mass Spectrometry, 1975
- Nature of the C7H7+ ions from toluene parent ion photodissociationJournal of the American Chemical Society, 1975
- Gas phase benzyl cations from toluene precursorsJournal of the American Chemical Society, 1974