The role of conformational heterogeneity in the excited state dynamics of linked diketopyrrolopyrrole dimers | ARC Centre of Excellence in Exciton Science
TitleThe role of conformational heterogeneity in the excited state dynamics of linked diketopyrrolopyrrole dimers
Publication TypeJournal Article
Year of Publication2021
AuthorsBradley, SJ, chi, ming, white, johnathan, Hall, CR, Goerigk, L, Smith, TA, Ghiggino, KP
JournalPhysical Chemistry Chemical Physics
Volume23
Issue15
Start Page9357
Pagination9357-9364
Abstract

Diketopyrrolopyrrole (DPP) derivatives have been proposed for both singlet fission and energy upconversion as they meet the energetic requirements and exhibit superior photostability compared to many other chromophores. In this study, both time-resolved electronic and IR spectroscopy have been applied to investigate excited state relaxation processes competing with fission in dimers of DPP derivatives with varying linker structures. A charge-separated (CS) state is shown to be an important intermediate with dynamics that are both solvent and linker dependent. The CS state is found for a subset of the total population of excited molecules and it is proposed that CS state formation requires suitably aligned dimers within a broader distribution of conformations available in solution. No long-lived triplet signatures indicative of singlet fission were detected, with the CS state likely acting as an alternative relaxation pathway for the excitation energy. This study provides insight into the role of molecular conformation in determining excited state relaxation pathways in DPP dimer systems.

Briefly describe the importance of this publication: 
This study provides insight into the role of molecular conformation in determining excited state relaxation pathways in DPP dimer systems.
Will this item be attributed as an output of other ARC Projects?: 
No
Did you acknowledge the centre in this publication?: 
Yes
Were any international co-authors involved?: 
No
Were any of your co-authors not affiliated with the centre?: 
Yes
Reporting year: 
2021
Impact Factor - grouped: 
Is this a joint publication between nodes?: 
No
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Which Centre platforms are related to the research?: 
Impact Factor: 
3.430