Abstract
The rates of intramolecular triplet energy transfer from carbazole (Cz) to naphthalene (Np) chromophore for the bichromophoric compounds with a flexible alkyl spacer, Cz−(CH2)n−Np, n = 4−12, doped in poly(methyl methacrylate) matrixes were measured by phosphorescence spectroscopy and laser flash photolysis. The results were interpreted in terms of a model that allows a distribution of donor−acceptor distances for a given spacer length by using Dexter's equation. This model provided the transfer rate for all the compounds tested, and the comparative study with experimental results indicated that the “through-space” mechanism mainly governs the intramolecular triplet−triplet energy transfer in flexible spacer compounds. The temperature dependence of the rates of triplet energy transfer was also investigated.
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