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Laser Flash Photolysis Generation, Spectra, and Lifetimes of Phenylcarbenium Ions in Trifluoroethanol and Hexafluoroisopropyl Alcohol. On the UV Spectrum of the Benzyl Cation
Author(s) -
McClelland Robert A.,
Chan Christopher,
Cozens Frances,
Modro Agnieszka,
Steenken Steen
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199113371
Subject(s) - flash photolysis , radiolysis , chemistry , benzyl alcohol , ion , photochemistry , photodissociation , irradiation , alcohol , spectral line , organic chemistry , kinetics , catalysis , reaction rate constant , radical , physics , quantum mechanics , astronomy , nuclear physics
What UV/VIS properties are anticipated for the benzyl cation? Studies on substituted benzyl cations created by laser flash photolysis predict a strong band at λ = 300–310 nm and a (ca. 90%) weaker band at λ = 430–460 nm for PhCH 2 . This indicates that the transient formed by pulse radiolysis and described in the literature as a benzyl cation with λ max = 363 nm is probably another carbenium ion, perhaps a cyclohexadienyl cation. The lifetime for PhCh 2 ⊕in (CF 3 ) 2 CHOH is probably only 2–20 ns.