Add time:08/08/2019         Source:sciencedirect.com

The formation of inclusion complexes between styryl dyes containing a dimethylamino group or azacrown-ether residue and cucurbit[7]uril (CB[7]) in aqueous solution was studied by 1H NMR spectroscopy and quantum chemistry. The complexes are characterized by 1:1 composition and the pseudorotaxane structure, which was confirmed by quantum chemical calculations. The free dyes and [email protected][7] complexes exhibit both prompt fluorescence and an ability to intersystem crossing. The triplet–triplet absorption spectra and the triplet lifetime of the free dyes and [email protected][7] were measured by ns-laser photolysis.

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