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Controlling the S1 Energy Profile by Tuning Excited-State Aromaticity.

Ryota KotaniLi LiuPardeep KumarHikaru KuramochiTahei TaharaPengpeng LiuAtsuhiro OsukaPeter B KaradakovShohei Saito
Published in: Journal of the American Chemical Society (2020)
The shape of the lowest singlet excited-state (S1) energy profile is of primary importance in photochemistry and related materials science areas. Here we demonstrate a new approach for controlling the shape of the S1 energy profile which relies on tuning the level of excited-state aromaticity (ESA). In a series of fluorescent π-expanded oxepins, the energy decrease accompanying the bent-to-planar conformational change in S1 becomes less pronounced with lower ESA levels. Stabilization energies following from ESA were quantitatively estimated to be 10-20 kcal/mol using photophysical data. Very fast planarization dynamics in S1 was revealed by time-resolved fluorescence spectroscopy. The time constants were estimated to be shorter than 1 ps, regardless of molecular size and level of ESA, indicating barrierless S1 planarization within the oxepin series.
Keyphrases
  • single molecule
  • high resolution
  • molecular dynamics simulations
  • electronic health record
  • artificial intelligence