Abstract
Isotactic, syndiotactic and atactic poly(methyl methacrylate)s (i-, s- and a-PMMA) labeled with a donor (carbazole) or an acceptor (anthracene) were prepared. The distance between the donor and acceptor fluorophores in complexed tactic PMMA was measured using Forster's energy transfer method and compared with that found for atactic PMMA. The measured average distance of the fluorophores in the stereocomplex (˜3.7 nm) was found to be shorter than that in atactic systems where stereocomplexation does not take place. The upper and lower boundaries for the dipole-dipole orientation factor (K2) in Forster's theory were determined by time-resolved emission anisotropy. The orientational freedom of the fluorophores was found to be restricted for tactic PMMA in N,N-dimethylformamide as a result of stereocomplex formation but for tactic PMMA in 1,4-dioxane and atactic PMMA in 1,4-dioxane and N,N-dimethylformamide, the dynamic average value of 〈K2〉 = 2/3 was used.
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