화학공학소재연구정보센터
Journal of Physical Chemistry B, Vol.102, No.15, 2640-2645, 1998
Intramolecular triplet energy transfer. 4. A carbazole-naphthalene system having a flexible alkyl spacer doped in poly(methyl methacrylate) matrixes
The rates of intramolecular tripler 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 tripler energy transfer was also investigated.