A re-evaluation of the photophysical properties of 1,4-bis(phenylethynyl)benzene: A model for poly(phenyleneethynylene)

被引:161
作者
Beeby, A [1 ]
Findlay, K [1 ]
Low, PJ [1 ]
Marder, TB [1 ]
机构
[1] Univ Durham, Dept Chem, Durham DH1 3LE, England
关键词
D O I
10.1021/ja025568h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Photophysical measurements, recorded in aerated cyclohexane at 283 K, indicate that 1,4-bis-(phenylethynyl) benzene behaves in a conventional manner, undergoing emission from the lowest vibrational level of the first excited singlet state; there is no evidence for aggregation of this material in cyclohexane solution in the concentration range (1-250) x 10(-6) mol dm(-3). However, in highly viscous, low-temperature glasses, the material does exhibit inhomogeneous fluorescence behavior, and wavelength-dependent excitation and emission spectra, indicative of a slow rate of relaxation of conformers of the excited states compared to the rate of fluorescence.
引用
收藏
页码:8280 / 8284
页数:5
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