Anion Photoelectron Spectroscopy of Rubrene: Molecular
Insights into Singlet Fission Energetics
Version 2 2017-09-14, 14:29
Version 1 2017-09-14, 14:23
Posted on 2017-09-14 - 14:29
Rubrene (C42H28, RUB) has been seen to be
attractive as a promising building block for organic semiconductors.
By means of gas-phase anion photoelectron spectroscopy, the adiabatic
electron affinity for RUB molecules is determined to be 1.48 ±
0.03 eV, and the S0–T1 and S0–S1 transition energies of RUB are evaluated to
be 1.16 ± 0.05 and 2.42 ± 0.05 eV, showing the possibility
of singlet fission in terms of energy. The photoelectron spectra indicate
that the vibronic coupling in RUB is similar in the neutral electronic
states of S0, T1, and S1. Quantum
chemistry calculation results demonstrate that the vibronic coupling
in these states originates from their similarly restricted structural
displacement upon photoexcitation. Molecular insights into energetics
suggest the important role of a charge transfer state in singlet fission.
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Tsunoyama, Hironori; Nakajima, Atsushi (2017). Anion Photoelectron Spectroscopy of Rubrene: Molecular
Insights into Singlet Fission Energetics. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b06900
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