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Mechanically interlocked pyrene-based photocatalysts

https://doi.org/10.1038/s41929-022-00799-y

Garci, Amine ; Weber, Jacob A. ; Young, Ryan M. ; Kazem-Rostami, Masoud ; Ovalle, Marco ; Beldjoudi, Yassine ; Atilgan, Ahmet ; Bae, Youn Jue ; Liu, Wenqi ; Jones, Leighton O. ; et al ( June 2022 , Nature Catalysis)

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Combining Intra- and Intermolecular Charge Transfer with Polycationic Cyclophanes To Design 2D Tessellations

https://doi.org/10.1021/jacs.9b07877

Cetin, M. Mustafa ; Beldjoudi, Yassine ; Roy, Indranil ; Anamimoghadam, Ommid ; Bae, Youn Jue ; Young, Ryan M. ; Krzyaniak, Matthew D. ; Stern, Charlotte L. ; Philp, Douglas ; Alsubaie, Fehaid M. ; et al ( November 2019 , Journal of the American Chemical Society)

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Quintet-triplet mixing determines the fate of the multiexciton state produced by singlet fission in a terrylenediimide dimer at room temperature

https://doi.org/10.1073/pnas.1820932116

Chen, Michelle ; Krzyaniak, Matthew D. ; Nelson, Jordan N. ; Bae, Youn Jue ; Harvey, Samantha M. ; Schaller, Richard D. ; Young, Ryan M. ; Wasielewski, Michael R. ( April 2019 , Proceedings of the National Academy of Sciences)

Singlet fission (SF) is a photophysical process in which one of two adjacent organic molecules absorbs a single photon, resulting in rapid formation of a correlated triplet pair (T₁T₁) state whose spin dynamics influence the successful generation of uncorrelated triplets (T₁). Femtosecond transient visible and near-infrared absorption spectroscopy of a linear terrylene-3,4:11,12-bis(dicarboximide) dimer (TDI₂), in which the two TDI molecules are directly linked at one of their imide positions, reveals ultrafast formation of the (T₁T₁) state. The spin dynamics of the (T₁T₁) state and the processes leading to uncoupled triplets (T₁) were studied at room temperature for TDI₂aligned in 4-cyano-4′-pentylbiphenyl (5CB), a nematic liquid crystal. Time-resolved electron paramagnetic resonance spectroscopy shows that the (T₁T₁) state has mixed⁵(T₁T₁) and³(T₁T₁) character at room temperature. This mixing is magnetic field dependent, resulting in a maximum triplet yield at ∼200 mT. The accessibility of the³(T₁T₁) state opens a pathway for triplet–triplet annihilation that produces a single uncorrelated T₁state. The presence of the⁵(T₁T₁) state at room temperature and its relationship with the¹(T₁T₁) and³(T₁T₁) states emphasize that understanding the relationship among different (T₁T₁) spin states is critical for ensuring high-yield T₁formation from singlet fission.

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Singlet fission in core-linked terrylenediimide dimers

https://doi.org/10.1063/5.0026254

Zhao, Xingang ; Bae, Youn Jue ; Chen, Michelle ; Harvey, Samantha M. ; Lin, Chenjian ; Zhou, Jiawang ; Schaller, Richard D. ; Young, Ryan M. ; Wasielewski, Michael R. ( December 2020 , The Journal of Chemical Physics)
Substituent effects on energetics and crystal morphology modulate singlet fission in 9,10-bis(phenylethynyl)anthracenes

https://doi.org/10.1063/1.5110411

Bae, Youn Jue ; Christensen, Joseph A. ; Kang, Gyeongwon ; Zhou, Jiawang ; Young, Ryan M. ; Wu, Yi-Lin ; Van Duyne, Richard P. ; Schatz, George C. ; Wasielewski, Michael R. ( July 2019 , The Journal of Chemical Physics)