title: [Laser photolysis studies on pyrene in ionic liquids and conventional solvents].
abstract: The photochemistry of pyrene in conventional solvents (acetone, acetonitrile, cyclohexane) and ionic liquids [Bmim] [PF6], [BuPy][BF4], R4 NNTf2 was investigated by time-resolved laser photolytic techniques. The transient absorption spectra of the excited pyrene and other radical species were compared. The absorption band of pyrene cation radical was observed in the acetone, acetronitrile and pyridinium ionic liquid [BuPy][BF4] systems. Only excited triplet pyrene was observed in cyclohexane and [Bmim][PF6] and R4 NNTf2. The result demonstrates that there was an interaction between pyrene and solvents, and the pyrene cation radical was formed by electron transfer from the excited state of pyrene to acetonitrile, acetone and [BuPy][BF4]. The possible mechanisms of the six systems were suggested.
authors.affiliation: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. fuhaiying@sinap.ac.cn
authors.forename: Hai-ying
authors.initials: HY
authors.lastname: Fu
authors.forename: Zhao-guo
authors.initials: ZG
authors.lastname: Xing
authors.forename: Guo-zhong
authors.initials: GZ
authors.lastname: Wu