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The Halogen-Bond Nature in Noble Gas–Dihalogen Complexes from Scattering Experiments and Ab Initio Calculations
Open AccessArticle

Halogen-Bond Assisted Photoinduced Electron Transfer

Department of Physical Chemistry, University of Geneva, CH-1211 Geneva, Switzerland
Author to whom correspondence should be addressed.
Current address: Department of Chemistry, James Franck Institute and Institute for Biophysical Dynamics, University of Chicago, Chicago, IL 60637, USA.
Molecules 2019, 24(23), 4361;
Received: 12 November 2019 / Revised: 25 November 2019 / Accepted: 25 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Halogen Bonds: Combining Experiment and Theory)
The formation of a halogen-bond (XB) complex in the excited state was recently reported with a quadrupolar acceptor–donor–acceptor dye in two iodine-based liquids (J. Phys. Chem. Lett. 2017, 8, 3927–3932). The ultrafast decay of this excited complex to the ground state was ascribed to an electron transfer quenching by the XB donors. We examined the mechanism of this process by investigating the quenching dynamics of the dye in the S1 state using the same two iodo-compounds diluted in inert solvents. The results were compared with those obtained with a non-halogenated electron acceptor, fumaronitrile. Whereas quenching by fumaronitrile was found to be diffusion controlled, that by the two XB compounds is slower, despite a larger driving force for electron transfer. A Smoluchowski–Collins–Kimball analysis of the excited-state population decays reveals that both the intrinsic quenching rate constant and the quenching radius are significantly smaller with the XB compounds. These results point to much stronger orientational constraint for quenching with the XB compounds, indicating that electron transfer occurs upon formation of the halogen bond. View Full-Text
Keywords: photochemistry; excited-state dynamics; time-resolved fluorescence; ultrafast IR spectroscopy photochemistry; excited-state dynamics; time-resolved fluorescence; ultrafast IR spectroscopy
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MDPI and ACS Style

Dereka, B.; Fureraj, I.; Rosspeintner, A.; Vauthey, E. Halogen-Bond Assisted Photoinduced Electron Transfer. Molecules 2019, 24, 4361.

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