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Modulation of photophysics and photostability of cationic coumarin 1 dye upon inclusion with macrocyclic host cucurbit[7]uril

Paper ID Volume ID Publish Year Pages File Format Full-Text
26299 43945 2015 7 PDF Available
Title
Modulation of photophysics and photostability of cationic coumarin 1 dye upon inclusion with macrocyclic host cucurbit[7]uril
Abstract

•Improvement in solubility, fluorescence intensity (24 times) and laser photostability of proton congener of coumarin 1 dye in water upon inclusion with the macrocyclic host cucurbit[7]uril (CB[7]) was observed.•These new results on encapsulation of cationic coumarin 1 dye with CB[7] should pave the way to superior molecular probes as biological sensors and UV laser dye.

The investigations on modulated photophysics and photostability of proton congener of coumarin 1 dye (C1-NH+) upon inclusion with the macrocyclic host cucurbit[7]uril (CB[7]) were carried out. The higher solubility, binding constant and tighter inclusion geometry of the C1-NH+@CB[7] complex were confirmed than that of the complex of parent neutral coumarin 1(C1-N) molecule by absorption, steady state fluorescence, 1H NMR spectroscopy techniques and DFT molecular modeling. Photostability study of both forms of the dye@CB[7] complexes in water showed distinct behavior, upon excitation by third harmonic (at 355 nm) of a pulsed Nd:YAG laser. These new results on formation of stronger inclusion complex of the protonated coumarin 1 dye with the host CB[7], particularly significant improvement in its solubility, fluorescence intensity and photostability in water, should permit superior molecular scale aqueous biological probes, sensors and UV laser dye.

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Keywords
Cationic coumarin 1; Cucurbit[7]uril; Host–guest inclusion; Laser dye; DFT modeling
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Modulation of photophysics and photostability of cationic coumarin 1 dye upon inclusion with macrocyclic host cucurbit[7]uril
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 300, 1 March 2015, Pages 15–21
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