- Excited-State Decay Pathways of Molecular Rotors: Twisted Intermediate or Conical Intersection?
- The Journal of Physical Chemistry Letters
- Volume | Issue number
- 7 | 21
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
Van 't Hoff Institute for Molecular Sciences (HIMS)
The fluorescence intensity of molecular rotors containing the dicyanomethylenedihydrofuran (DCDHF) motif increases strongly with solvent viscosity. Single-bond and double-bond rotations have been proposed as pathways of nonradiative decay for this and related molecular rotors. We show here that both are involved in the case of DCDHF rotors: Fluorescence is quenched by rotation around the dicyanomethylene double bond in nonpolar solvents, but in a sufficiently polar environment rotation about a formally single bond leads to a dark internal charge-transfer state.
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