Volume 57, Issue 50 pp. 16291-16295
Communication

Tuning Intramolecular Förster Resonance Energy Transfer and Activating Intramolecular Singlet Fission

Giulia Lavarda

Giulia Lavarda

Departamento de Química Orgánica and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain

These authors contributed equally to this work.

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Dr. Johannes Zirzlmeier

Dr. Johannes Zirzlmeier

Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058 Erlangen, Germany

These authors contributed equally to this work.

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Dr. Marco Gruber

Dr. Marco Gruber

Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany

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Parisa R. Rami

Parisa R. Rami

Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada

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Prof. Rik R. Tykwinski

Corresponding Author

Prof. Rik R. Tykwinski

Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany

Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada

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Prof. Dr. Tomás Torres

Corresponding Author

Prof. Dr. Tomás Torres

Departamento de Química Orgánica and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain

IMDEA-Nanociencia, Campus de Cantoblanco, 28049 Madrid, Spain

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Prof. Dr. Dirk M. Guldi

Corresponding Author

Prof. Dr. Dirk M. Guldi

Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058 Erlangen, Germany

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First published: 19 September 2018
Citations: 30

Dedicated to Professor Dan Meyerstein on the occasion of his 80th birthday

Graphical 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.

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.

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