Enhanced intersystem crossing in core-twisted aromatics
We describe the design, bottom-up synthesis and X-ray single crystal structure of systematically twisted aromatics and for efficient intersystem crossing. Steric congestion at the cove region creates a nonplanar geometry that induces a significant yield of triplet excited states in the electron-poor...
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| Veröffentlicht in: | Chemical science (Cambridge) 2017-03, Vol.8 (3), p.1776-1782 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | We describe the design, bottom-up synthesis and X-ray single crystal structure of systematically twisted aromatics
and
for efficient intersystem crossing. Steric congestion at the cove region creates a nonplanar geometry that induces a significant yield of triplet excited states in the electron-poor core-twisted aromatics
and
. A systematic increase in the number of twisted regions in
and
results in a concomitant enhancement in the rate and yield of intersystem crossing, monitored using femtosecond and nanosecond transient absorption spectroscopy. Time-resolved absorption spectroscopic measurements display enhanced triplet quantum yields (
= 10 ± 1% for
and
= 30 ± 2% for
) in the twisted aromatics when compared to a negligible
( |
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| ISSN: | 2041-6520 2041-6539 |
| DOI: | 10.1039/c6sc05126j |