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Intramolecular Charge Transfer of 1-Aminoanthraquinone and Ultrafast Solvation Dynamics of Dimethylsulfoxide

Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Grazia Cottone
Int. J. Mol. Sci. 2021, 22(21), 11926; https://doi.org/10.3390/ijms222111926
Received: 17 September 2021 / Revised: 29 October 2021 / Accepted: 1 November 2021 / Published: 3 November 2021
(This article belongs to the Section Physical Chemistry and Chemical Physics)
The intramolecular charge transfer (ICT) of 1-aminoanthraquinone (AAQ) in the excited state strongly depends on its solvent properties, and the twisted geometry of its amino group has been recommended for the twisted ICT (TICT) state by recent theoretical works. We report the transient Raman spectra of AAQ in a dimethylsulfoxide (DMSO) solution by femtosecond stimulated Raman spectroscopy to provide clear experimental evidence for the TICT state of AAQ. The ultrafast (~110 fs) TICT dynamics of AAQ were observed from the major vibrational modes of AAQ including the νC-N + δCH and νC=O modes. The coherent oscillations in the vibrational bands of AAQ strongly coupled to the nuclear coordinate for the TICT process have been observed, which showed its anharmonic coupling to the low frequency out of the plane deformation modes. The vibrational mode of solvent DMSO, νS=O showed a decrease in intensity, especially in the hydrogen-bonded species of DMSO, which clearly shows that the solvation dynamics of DMSO, including hydrogen bonding, are crucial to understanding the reaction dynamics of AAQ with the ultrafast structural changes accompanying the TICT. View Full-Text
Keywords: intramolecular charge transfer; excited-state dynamics; solvation dynamics; coherent oscillations; femtosecond stimulated Raman spectroscopy intramolecular charge transfer; excited-state dynamics; solvation dynamics; coherent oscillations; femtosecond stimulated Raman spectroscopy
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MDPI and ACS Style

Jeon, K.; Jen, M.; Lee, S.; Jang, T.; Pang, Y. Intramolecular Charge Transfer of 1-Aminoanthraquinone and Ultrafast Solvation Dynamics of Dimethylsulfoxide. Int. J. Mol. Sci. 2021, 22, 11926. https://doi.org/10.3390/ijms222111926

AMA Style

Jeon K, Jen M, Lee S, Jang T, Pang Y. Intramolecular Charge Transfer of 1-Aminoanthraquinone and Ultrafast Solvation Dynamics of Dimethylsulfoxide. International Journal of Molecular Sciences. 2021; 22(21):11926. https://doi.org/10.3390/ijms222111926

Chicago/Turabian Style

Jeon, Kooknam, Myungsam Jen, Sebok Lee, Taehyung Jang, and Yoonsoo Pang. 2021. "Intramolecular Charge Transfer of 1-Aminoanthraquinone and Ultrafast Solvation Dynamics of Dimethylsulfoxide" International Journal of Molecular Sciences 22, no. 21: 11926. https://doi.org/10.3390/ijms222111926

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