The fluorescence quenching of organic dyes via H-bonding interactions is well-known. However, the mechanism of this Hydrogen-Bond Induced Nonradiative Deactivation (HBIND) is not understood. To gain insight into this process, we applied a new ‘solute-pump/solvent probe’ approach to directly monitor the local solvent environment around the dye. H-bonds strengthening and dissipation of the excitation energy from the chromophore into the solvent can be visualised with femtosecond time resolution. Our data reveal the key role of both H-bond strength and intermolecular coupling. HBIND could be exploited for the design of new fluorescent probes that only light up when located in non-aqueous environments.
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Physical Chemistry Department - Sciences II - University of Geneva
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