title: A re-evaluation of the photophysical properties of 1,4-bis(phenylethynyl)benzene: a model for poly(phenyleneethynylene).
abstract: 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.
authors.affiliation: Department of Chemistry, University of Durham, Durham DH1 3LE, United Kingdom. Andrew.Beeby@durham.ac.uk
authors.forename: Andrew
authors.initials: A
authors.lastname: Beeby
authors.forename: Karen
authors.initials: K
authors.lastname: Findlay
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Low
authors.forename: Todd B
authors.initials: TB
authors.lastname: Marder