Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 16, Pages 5437-5448Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00634c
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Funding
- MINECO [CTQ2017-87773-P/AEI/FEDER]
- UE
- Spanish Structures Excellence Maria de Maeztu program [MDM-2017-0767]
- Catalan DURSI [2017SGR348]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Curie Skodowska-Curie grant [642294]
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Materials based on regular pi-stacks of planar organic radicals are intensively pursued by virtue of their technologically relevant properties. Yet, these pi-stacks are commonly unstable against pi-dimerization. In this computational study, we reveal that regular pi-stacks of planar dithiazolyl radicals can be rendered stable, in some range of temperatures,viatwo different mechanisms. When the radicals of a pi-stack are both longitudinally and latitudinally slipped with respect to each other, the corresponding regular pi-stacked configuration is associated with a locally stable minimum in the potential energy surface of the system. Conversely, those regular pi-stacks in which radicals are latitudinally slipped with respect to each other are stable as a result of a dynamic interconversion between two degenerate dimerized configurations. The existence of two stabilization mechanisms, which can be traced back to the bonding properties of isolated pi-dimers, translates into two different ways of exploiting spin-Peierls-like transitions in switchable dithiazolyl-based materials.
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