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Fluorescent Signaling Based on Control of Excited State Dynamics. Biarylacetylene Fluorescent Chemosensors

2002; American Chemical Society; Volume: 124; Issue: 7 Linguagem: Inglês

10.1021/ja017309i

1943-2984

Sherri A. McFarland, Nathaniel S. Finney,

Molecular Sensors and Ion Detection

We have previously reported that metal ion binding could restrict the excited state rotation of a biaryl chromophore, suppressing intersystem crossing and leading to increased emission. We have now applied the restriction of excited state dynamics to suppression of the other fundamental nonradiative decay pathway, internal conversion, in biarylacetylenes. This indicates that both nonradiative decay pathways are subject to conformational control, and that this signaling pathway should be generally accessible in simple flexible fluorophores.