Electron Hopping in π-Stacked Covalent and Self-Assembled Perylene Diimides Observed by ENDOR Spectroscopy
- 25 January 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 128 (6), 1782-1783
- https://doi.org/10.1021/ja057031k
Abstract
We have carried out room-temperature, solution-phase electron paramagnetic resonance and electron−nuclear double resonance studies on a series of radical anions based upon perylene-3,4:9,10-bis(dicarboximide) (PDI). The following systems were studied: two PDI monomers, a covalent, cofacial dimer, and two covalent trefoil-PDI3 molecules, one of which self-assembles into π-stacked dimers. Full sharing of the unpaired electron in the covalent and self-assembled dimers is revealed by a halving of the hyperfine coupling constants in these species, relative to those of the monomers. These results and the electronic absorption spectra show that electron hopping on a >107 Hz time scale occurs between a reduced and neutral chromophoric pair.Keywords
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