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Benzo-annulated aza[9]helicene ([9]AH) and thia[9]helicene ([9]TH) were prepared as novel π-extended heterohelicenes. [9]TH showed a quite short fluorescence lifetime of ∼0.3 ns and intense phosphorescence at low temperature that were attributed to its larger spin–orbit coupling and faster intersystem crossing between pseudo-degenerate S1/2 and triplet states.
Y. Kondo, Y. Tsutsui, Y. Matsuo, T. Tanaka and S. Seki, Nanoscale Adv., 2024, 6, 4567 DOI: 10.1039/D4NA00516C
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