Altering singlet fission pathways in perylene-dimers; perylene-diimide versus perylene-monoimide

Papadopoulos I, Gutierrez-Moreno D, Bo Y, Casillas R, Greißel P, Clark T, Fernandez-Lazaro F, Guldi DM (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Nanoscale Royal Society of Chemistry

Book Volume: 14

Pages Range: 5194-5203

Journal Issue: 13

DOI: 10.1039/d1nr08523a

Abstract

We used a systematic approach to shed light on the inherent differences in perylenes, namely monoimides versus diimides, including coplanarity and dipole moment, and their impact on singlet fission (SF) by designing, synthesizing, and probing a full fledged series of phenylene- and naphthalene-linked dimers. Next to changing the functionality of the perylene core, we probed the effect of the spacers and their varying degrees of rotational freedom, molecular electrostatic potentials, and intramolecular interactions on the SF-mechanism and -efficiencies. An arsenal of spectroscopic techniques revealed that for perylene-monoimides, a strong charge-transfer mixing with the singlet and triplet excited states restricts SF and yields low triplet quantum yields. This is accompanied by an up-conversion channel that includes geminate triplet-triplet recombination. Using perylene-diimides alters the SF-mechanism by populating a charge-separated-state intermediate, which either favors or shuts-down SF. Napthylene-spacers bring about higher triplet quantum yields and overall better SF-performance for all perylene-monoimides and perylene-diimides. The key to better SF-performance is rotational freedom because it facilitates the overall excited-state polarization and amplifies intramolecular interactions between chromophores.

Authors with CRIS profile

Ilias Papadopoulos Lehrstuhl für Physikalische Chemie I Yifan Bo Lehrstuhl für Physikalische Chemie I Ruben Casillas Pacheco Lehrstuhl für Physikalische Chemie I Phillip Greißel Lehrstuhl für Physikalische Chemie I Timothy Clark Computer-Chemie-Centrum (CCC) Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Involved external institutions

Miguel Hernández University of Elche (UMH) / Universidad Miguel Hernández de Elche ES Spain (ES)

How to cite

APA:

Papadopoulos, I., Gutierrez-Moreno, D., Bo, Y., Casillas, R., Greißel, P., Clark, T.,... Guldi, D.M. (2022). Altering singlet fission pathways in perylene-dimers; perylene-diimide versus perylene-monoimide. Nanoscale, 14(13), 5194-5203. https://doi.org/10.1039/d1nr08523a

MLA:

Papadopoulos, Ilias, et al. "Altering singlet fission pathways in perylene-dimers; perylene-diimide versus perylene-monoimide." Nanoscale 14.13 (2022): 5194-5203.

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