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

• Published in: Journal of the American Chemical Society Vol. 124; no. 7; pp. 1178 - 1179
• Main Authors: McFarland, Sherri A, Finney, Nathaniel S
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 20.02.2002
• Subjects: Atomic and molecular physics; Exact sciences and technology; Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion); Molecular properties and interactions with photons; Physics; Radiationless transitions, quenching; Fluorescence spectroscopy; Acetylenic compound; Electronically excited state; Internal conversion; Intersystem crossing; Radiative lifetimes; Experimental study; Nonradiative transitions; Organic compounds; Luminescence decay
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/ja017309i

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.