Scientific article
English

Ground-State Structure and Excited-State Dynamics of a Donor–Acceptor Complex with Two Charge-Transfer Bands

Published inThe journal of physical chemistry letters, vol. 16, p. 5327-5333
First online date2025-05-20
Abstract

Although electron donor-acceptor complexes have been known for more than 70 years and are increasingly used in various applications, very little is still known about their structure in liquids. Here, we investigate the excited-state dynamics of a complex with two charge-transfer (CT) bands, which are usually discussed in terms of two distinct geometries, opening the possibility for photoselection. Apart from an initial ultrafast internal conversion to the lowest CT state upon high-energy band excitation, the ensuing dynamics do not depend on which CT transition has been excited, suggesting complexes of similar structures. The pure ground-state bleach dynamics, extracted using polarized transient absorption measurements, does not exhibit any hole-burning effect and is independent of the excitation wavelength, indicating an absence of photoselection. These results are rationalized using molecular dynamics simulations, which point to a broad distribution of structures with a significant oscillator strength for both transitions, contrary to the generally accepted picture.

Research groups
Citation (ISO format)
WEGA, Johannes, RUMBLE, Christopher A, VAUTHEY, Eric. Ground-State Structure and Excited-State Dynamics of a Donor–Acceptor Complex with Two Charge-Transfer Bands. In: The journal of physical chemistry letters, 2025, vol. 16, p. 5327–5333. doi: 10.1021/acs.jpclett.5c01136
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Article (Published version)
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Article (Accepted version)
accessLevelRestrictedaccessLevelPublic 21/05/2026
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Additional URL for this publicationhttps://pubs.acs.org/doi/10.1021/acs.jpclett.5c01136
Journal ISSN1948-7185
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