Abstract
Phenyleneethynylene-based and thienyleneethynylene-based π-conjugated polymers with imidazolium cationic units in the main chain and their model compounds were synthesized and characterized. The imidazolium-containing cationic polymers were transferred to an ionic liquid by the spontaneous anion-exchange from iodide to bis(trifluoromethanesulfonyl)imide (TFSI). The fluorescence quantum yield of phenyleneethynylene-based π-conjugated polymer in the ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (emimTFSI), was higher than that of polymer based on iodide anion in pyridine because of a low degree of aggregation of the main chain and/or the absence of an external heavy-atom effect of the iodide counteranion. UV−vis and fluorescence spectra of N-methylated polymer and model compound with TFSI counteranion exhibited a significant blue shift with respect to the parent neutral molecules. Density functional theory (DFT) calculations for the model compounds showed a decrease in π-conju...
Published Version
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