Related Experiment Video
Updated: Feb 10, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Enacting Two-Electron Transfer from a Double-Triplet State of Intramolecular Singlet Fission
Hyungjun Kim1, Bradley Keller1, Rosina Ho-Wu1
1Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States.
Abstract:
A simulation-led strategy enacts two-electron transfer between an intramolecular singlet fission chromophore (tetracyanomethylene quinoidal bithiopehene with β,β'-solubilizing groups) and multielectron acceptor (anthraquinone). The thermodynamic plausibility of multielectron transfer from a double-triplet state and the absorption spectra of electron transfer (ET) products were predicted using quantum chemical simulations. These predictions are consistent with experimental observations of reduced lifetimes in time-resolved fluorescence spectroscopy, changes in transmission profile, and appearance of new absorption bands in transient absorption spectroscopy, all of which support multi-ET in the QOT2/AQ mixture. The analysis suggests 2ET is favored over 1ET by a 2.5:1 ratio.
Related Concept Videos
Intermolecular vs Intramolecular Forces
Nuclear Fission
Ionic Bonding and Electron Transfer
Binary Fission
Binary Fission
Intramolecular Aldol Reaction

