Tuning Intramolecular Förster Resonance Energy Transfer and Activating Intramolecular Singlet Fission. Issue 50 (19th October 2018)

• Record Type: Journal Article
• Authors: Lavarda, Giulia; Zirzlmeier, Johannes; Gruber, Marco; Rami, Parisa R.; Tykwinski, Rik R.; Torres, Tomás; Guldi, Dirk M.
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 50(2018)
• Page Start: 16291
• Page End: 16295
• Publication Date: 2018-10-19
• Subjects: Förster resonance energy transfer -- intramolecular singlet fission -- photochemistry -- transient absorption spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201808652
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The synergy of panchromatic absorption throughout most of the visible range of the solar spectrum and intramolecular singlet fission (SF) has been realized in a series of conjugates featuring different light‐harvesting subphthalocyanines (SubPcs) and an energy accepting pentacene dimer (Pnc2 ). At the focal point was a modular SubPc approach, which was based on decorating the SubPc core with different peripheral substituents to tailor and fine‐tune their optical properties. Transient absorption measurements assisted in corroborating that the SubPcs act as energy‐transfer antennas by means of unidirectional and quantitative intramolecular Förster resonance energy transfer (FRET) to the Pnc2, where an intramolecular SF affords triplet quantum yields reaching unity. Abstract : FRETter by design : Three subphthalocyanine (SubPc)/pentacene dimer (Pnc2 ) conjugates were prepared for the synergy of panchromatic light absorption, energy transfer, and intramolecular singlet fission (SF). Transient absorption measurements confirmed the reaction sequence of light harvesting by the SubPcs, unidirectional Förster resonance energy transfer (FRET) from the SubPcs to the Pnc2, and almost quantitative intramolecular SF.