title: Formation and decomposition of distonic o-, m-, and p-benzyne radical cations from photolysis of Mg(+)(o-, m-, p-C(6)H(4)F(2)).
abstract: Distonic o-, m-, and p-benzyne radical cations (1-3) have been generated by a novel photolysis reaction of mass-selected Mg(+)-difluorobenzene complexes. The energy required for the formation of these radical cations is within 2.2 eV. The formation of o-benzyne cation is most facile. The benzyne radical cations dissociate further to yield ethyne and 1,3-butadiyne radical cation as major products given a sufficient amount of energy. The whole process involves only a single photon, and is very efficient. The calculated threshold for the formation of 1,3-butadiyne radical cation from Mg(+)(o-C(6)H(4)F(2)) is about 4.6 eV, quite comparable with the experimental estimate.
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Hai-Chuan
authors.initials: HC
authors.lastname: Liu
authors.forename: Chang-Sheng
authors.initials: CS
authors.lastname: Wang
authors.forename: Wenyue
authors.initials: W
authors.lastname: Guo
authors.forename: Yun-Dong
authors.initials: YD
authors.lastname: Wu
authors.forename: Shihe
authors.initials: S
authors.lastname: Yang