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We performed detailed single-molecule polarization anisotropy studies of the bare and the encapsulated conjugated polymers, which indicate that the encapsulated polymers are more extended than the bare chains and less prone to kinking. However, in view of the lack of suitable standards of rigid rod polymers for GPC, we note that the absolute values of the molecular weight of the polymers should be treated with caution at present. We are currently working on more accurate determinations of the molecular weight. While relative comparisons between different chain lengths are unproblematic as shown in Figure 3, we refrain from making a direct comparison of the molecular weights of bare and encapsulated polymers. While the macrocycles do not appear to have an impact on the electronic properties of the polymer other than to improve photochemical stability, we anticipate that an enhancement of structural rigidity should facilitate exciton migration along the chain, a prerequisite for the in
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We performed detailed single-molecule polarization anisotropy studies of the bare and the encapsulated conjugated polymers, which indicate that the encapsulated polymers are more extended than the bare chains and less prone to kinking. However, in view of the lack of suitable standards of rigid rod polymers for GPC, we note that the absolute values of the molecular weight of the polymers should be treated with caution at present. We are currently working on more accurate determinations of the molecular weight. While relative comparisons between different chain lengths are unproblematic (as shown in Figure 3), we refrain from making a direct comparison of the molecular weights of bare and encapsulated polymers. While the macrocycles do not appear to have an impact on the electronic properties of the polymer other than to improve photochemical stability, we anticipate that an enhancement of structural rigidity should facilitate exciton migration along the chain, a prerequisite for the interaction of excitons generated on different chromophores of the polymer.
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71
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34250887129
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We refrain from attempting to calculate the precise number of excitons present per molecule for a given excitation density owing to the present uncertainty in determining the molecular weight accurately. Suffice it to note that the threshold for sublinear behavior-should provide a signature of the presence of two excitons on the molecule. We expect the threshold for nonlinear interactions to be substantially increased in the bare polymer owing to the reduced exciton (PL) lifetime and the most likely decreased rigidity which should impede exciton mobility
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We refrain from attempting to calculate the precise number of excitons present per molecule for a given excitation density owing to the present uncertainty in determining the molecular weight accurately. Suffice it to note that the threshold for sublinear behavior-should provide a signature of the presence of two excitons on the molecule. We expect the threshold for nonlinear interactions to be substantially increased in the bare polymer owing to the reduced exciton (PL) lifetime and the most likely decreased rigidity which should impede exciton mobility.
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