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Photoprocesses in styryl dyes and their pseudorotaxane complexes with cucurbit[7]uril

Paper ID Volume ID Publish Year Pages File Format Full-Text
27237 44011 2013 10 PDF Available
Title
Photoprocesses in styryl dyes and their pseudorotaxane complexes with cucurbit[7]uril
Abstract

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 dye@CB[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 dye@CB[7] were measured by ns-laser photolysis.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlight► 4-Pyridine styryl dyes having a dimethylamino group or aza-18-crown-6-ether residue form stable 1:1 complexes with cucurbit[7]uril in aqueous solutions. ► Pseudorotaxane structure of host–guest complexes dye@CB[7] was confirmed by 1H NMR spectroscopy and DFT calculations. ► Fluorescence was strongly increased in the presence of CB[7] due to stabilization of planar E isomer of the dye within complex. ► The formation of complexes results in increasing of the probability of the intersystem crossing.

Keywords
Styryl dyes; Cucurbit[7]uril; Inclusion complexes; Stability constants; Triplet states; Fluorescence
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 253, 1 February 2013, Pages 52–61
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us