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A Re-evaluation Of The Photophysical Properties Of 1,4-bis(phenylethynyl)benzene: A Model For Poly(phenyleneethynylene).

A. Beeby, Karen S. Findlay, P. Low, T. Marder
Published 2002 · Chemistry, Medicine

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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.



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