Structure-Dependent Balance between Excited-State Deactivation Pathways in Cross-Conjugated Molecular Photoswitches

Diaryl thieno-[3,4- ]thiophenes (TT) are photoswitchable compounds that operate through reversible photoinduced cyclization/cycloreversion and have been designed specifically for integration within π-conjugated polymers to switchably manipulate polymer electronic properties. Here we report on how cr...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2024-12
Main Authors: O'Connor, Luke R, Adams, Nicholas P, Honick, Chana R, Song, Yuqi, Haldar, Neal, Tovar, J D, Bragg, Arthur E
Format: Article
Language:English
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Summary:Diaryl thieno-[3,4- ]thiophenes (TT) are photoswitchable compounds that operate through reversible photoinduced cyclization/cycloreversion and have been designed specifically for integration within π-conjugated polymers to switchably manipulate polymer electronic properties. Here we report on how cross conjugating the central TT moiety impacts photocyclization dynamics as interrogated using transient absorption spectroscopy (TAS) for a series of switches built with electron-rich substituents that have various electronic interaction strengths with the TT core. For cross-conjugated structures exhibiting a propensity to switch in steady-state photoconversion experiments, ultrafast TAS reveals signatures of rapid dynamics (occurring within
ISSN:1089-5639
1520-5215
1520-5215
DOI:10.1021/acs.jpca.4c06720