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Ultrafast dynamics and solvent-dependent deactivation kinetics of BODIPY molecular rotors

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Abstract

Molecular rotors based on meso-substituted boron-dipyrromethane (BODIPY) are widely recognized fluorescent viscosity sensors. The viscosity dependence of their fluorescence arises from an efficient excited-state deactivation process that can only occur when molecular-scale motion is not hindered. Here, we use visible and IR pump–probe spectroscopies combined with TD-DFT calculations to show that this fluorescence deactivation takes place through a fast and irreversible process which does not involve intermediate electronic states. Our data indicate that nonradiative excited-state deactivation of BODIPY molecular rotors is practically independent of solvent polarity, but strongly governed by viscoelastic/free volume properties of the local environment in both low- and high-viscosity regimes.

Graphical abstract: Ultrafast dynamics and solvent-dependent deactivation kinetics of BODIPY molecular rotors

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Publication details

The article was received on 29 Mar 2017, accepted on 12 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02037F
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Ultrafast dynamics and solvent-dependent deactivation kinetics of BODIPY molecular rotors

    T. Suhina, S. Amirjalayer, S. Woutersen, D. Bonn and A. M. Brouwer, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP02037F

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