Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 45, Pages 18809-18815Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja309000s
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Funding
- National Institutes of Health [5R01CA088986, 5P41RR005351, 8P41GM103390, R01GM067169]
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Fluorogenic reactions in which non- or weakly fluorescent reagents produce highly fluorescent products can be exploited to detect a broad range of compounds including biomolecules and materials. We describe a modified dibenzocyclooctine that under catalyst-free conditions undergoes fast strain promoted cycloadditions with azides to yield strongly fluorescent triazoles. The Cycloaddition products are more than 1000-fold brighter compared to the Starting cyclooctyne, exhibit large Stokes shift,. and can be excited above 350 nm, which is required for many applications. Quantum mechanical: calculations indicate that the fluorescence increase upon triazole formation is due to large differences in oscillator strengths of the S-0 <-> S-1 transitions in the planar C-2v-symmetric starting material compared to the symmetry broken and nonplanar.cycloaddition products. The new fluorogenic probe was successfully employed for labeling of proteins modified by an azide moiety.
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