Transition between dilute and concentrated solution behaviour as revealed by excimer fluorescence |
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| Authors: | J Roots B Nyström |
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| Institution: | Institute of Physical Chemistry, University of Uppsala, P.O. Box 532, S-751 21 Uppsala, Sweden |
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| Abstract: | Excimer fluorescence measurements at 25° on polystyrene, with molecular weights 111,000, 392,000 and 900,000, in 1,2-dichloroethane over an extended concentration region are reported. The curve representing the normalized ratio of excimer to monomer fluorescence intensities shows an upward curvature at cη] ≈ 1 for all the molecular weights. This observation is attributed to enhanced intermolecular excimer formation. Some theoretical aspects on this phenomenon are also considered. |
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