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Tautomerization of lumichrome promoted by supramolecular complex formation with cucurbit[7]uril

Paper ID Volume ID Publish Year Pages File Format Full-Text
27303 44015 2009 5 PDF Available
Title
Tautomerization of lumichrome promoted by supramolecular complex formation with cucurbit[7]uril
Abstract

Addition of cucurbit[7]uril to an aqueous solution of lumichrome led to the formation of a new red-shifted band in both the absorption and fluorescence spectra indicating that binding to this rigid macrocyclic host facilitated the partial transformation into isoalloxazine-type structure. Global analysis of the results of spectrophotometric and spectrofluorometric titrations provided log K = 3.92 ± 0.06 for the logarithm of the equilibrium constant of 1:1 association. The dual fluorescence of the complex was quenched by protons in a diffusion-controlled process. Cucurbit[7]uril was found to exert negligible effect on the deprotonation of lumichrome in basic solution.

Keywords
Self-assembly; Inclusion complex; Fluorescence; Tautomerization; Host–guest binding
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 207, Issue 1, 5 September 2009, Pages 47–51
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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