The article traces the development of the epr and optical spectroscopic characterisation and progressive theoretical understanding of the aryl cation, starting from the initial cryogenic epr study of 2,5-dialkoxyl-4-morpholinophenyl cation, which defined unambiguously its triplet state character, through simple MO, ab initio and DFT calculations on substituted aryl cations, to picosecond laser photolysis studies in fluorinated solvents, noting especially the early and vital contribution of Martyn Symons.
LicariJ. J., and CrepeauP. C., US patent 3, 205, 157 (1965).
11.
TyrrellA., Basics of reprography, Focal Press, London, 1972.
12.
TaftR. W., J. Am. Chem. Soc., 1961, 83, 5428.
13.
CoxA., KempT. J., PayneD. R., SymonsM. C. R., AllenD. M., and Pinot de MoiraP., J. Chem. Soc., Chem. Commun., 1976, 694.
14.
CoxA., KempT. J., PayneD. R., SymonsM. C. R., and Pinot de MoiraP., J. Am Chem. Soc., 1978, 100, 4779.
15.
AmbrozH. B., and KempT. J., J. Chem. Soc., Perkin 2, 1979, 1420.
16.
AbsarL., and McEwenK. L., cited in R. A. Abramovitch in Advances in Free Radical Chemistry, ed. WilliamsG. H., Academics Press, London. 1967, vol. 2, p. 116.
17.
EvlethE. M., and HorowitzP. M.J. Am. Chem. Soc., 1971, 93, 5636.
18.
GleiterR., HoffmannR., and StohrerW. D., Chem. Ber., 1972, 105, 8.
19.
DillJ. D., SchleyerP. von R., BinkleyJ. S., SeegerR., PopleJ. A., and HaselbachE., J. Am. Chem. Soc., 1976, 98, 5428.
20.
DillJ. D., SchleyerP. von R., and PopleJ. A., J. Am. Chem. Soc., 1977, 99, 1.
21.
NicolaidesA., SmithD. M., JensenF., and RadomL., J. Phys. Chem., 1997, 119, 8083.
22.
HrusákJ., SchröderD., and IwataS., J. Chem. Phys., 1997, 106, 7541.
23.
LaaliK. K., RasulG., Surya PrakashG. K., and OlahG. A., J. Org. Chem., 2002, 67, 2913.
24.
AschiM., and HarveyJ. N., J. Chem. Soc., Perkin Trans. 2, 1999, 1059.
25.
SmithD. M., MaksicZ. B., and MaskillH., J. Chem. Soc., Perkin Trans. 2, 2002, 906.
26.
AmbrozH. B., and KempT. J., J. Chem. Soc., Perkin II, 1980, 768.
