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Control of electronic and exchange coupling by bridge substituents in donor acceptor triads with triptycene bridges

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2024

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Lambert, Christoph
Roger, Chantal
Schmiedel, Alexander
Holzapfel, Marco
Lukzen, Nikita

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Physical Chemistry, Chemical Physics. Royal Society of Chemistry (RSC). 2024, 26(38), S. 24983-24994. ISSN 1463-9076. eISSN 1463-9084. Verfügbar unter: doi: 10.1039/d4cp03148b

Zusammenfassung

A series of triads, consisting of a triarylamine electron donor and a perylene diimide electron acceptor which were attached to two different wings of a triptycene bridging unit, was investigated concerning the dynamics of photoinduced charge separation and charge recombination processes with a particular focus on the involved spin-chemical aspects. Attaching electron-donating or electron-withdrawing substituents to the third wing of the triptycene bridge allowed tuning the electron transfer processes. These processes were investigated via fs-transient absorption spectroscopy and ns-transient absorption spectroscopy in an external magnetic field. The resulting magnetic field-dependent decay dynamics were analysed and modelled using the stochastic Liouville equation which yielded rate constants for the charge recombination and the exchange energy. In combination with a diabatic rate theory and Anderson's perturbative treatment of the exchange energy, these data gave a complete set of rate constants for charge separation and charge recombination from which the diverse electronic couplings between the involved states were derived. These couplings depend linearly on the inverse energy of virtual triptycene bridge states which allows tuning the electron transfer dynamics by modifying the triptycene bridge.

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570 Biowissenschaften, Biologie

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ISO 690LAMBERT, Christoph, Chantal ROGER, Alexander SCHMIEDEL, Marco HOLZAPFEL, Nikita LUKZEN, Ulrich STEINER, 2024. Control of electronic and exchange coupling by bridge substituents in donor acceptor triads with triptycene bridges. In: Physical Chemistry, Chemical Physics. Royal Society of Chemistry (RSC). 2024, 26(38), S. 24983-24994. ISSN 1463-9076. eISSN 1463-9084. Verfügbar unter: doi: 10.1039/d4cp03148b
BibTex
@article{Lambert2024Contr-71186,
  year={2024},
  doi={10.1039/d4cp03148b},
  title={Control of electronic and exchange coupling by bridge substituents in donor acceptor triads with triptycene bridges},
  number={38},
  volume={26},
  issn={1463-9076},
  journal={Physical Chemistry, Chemical Physics},
  pages={24983--24994},
  author={Lambert, Christoph and Roger, Chantal and Schmiedel, Alexander and Holzapfel, Marco and Lukzen, Nikita and Steiner, Ulrich}
}
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