Matrices glassy, excited species

Figure 1 illustrates the total fluorescence matrix in contour format for BuPBD euid poly (VBuPBD) at 298K. These spectra graphically illustrate the above conclusions and the symmetry of the broadened profile of the polymer emission with respect to the emission/excitation axes is convincing evidence for the excimeric nature of the species responsible for the low energy intensity component. In addition the emission of both polymers reduces to that of the unassociated monomeric chromophore upon dispersal in a glassy (MeTHF) matrix at 77K. The effect is illustrated for poly (VBuPBD) in Figure 2. This observation is consistent with the formation of intramolecular excimers by a conformational sampling mecheutism.

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