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Article

Intramolecular Charge Transfer of Curcumin and Solvation Dynamics of DMSO Probed by Time-Resolved Raman Spectroscopy

Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea
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Academic Editors: Hyotcherl Ihee, Tae Kyu Kim, Hyungjun Kim and Young Min Rhee
Int. J. Mol. Sci. 2022, 23(3), 1727; https://doi.org/10.3390/ijms23031727
Received: 19 December 2021 / Revised: 25 January 2022 / Accepted: 31 January 2022 / Published: 2 February 2022
Intramolecular charge transfer (ICT) of curcumin in dimethyl sulfoxide (DMSO) solution in the excited state was investigated by femtosecond electronic and vibrational spectroscopy. Excited-state Raman spectra of curcumin in the locally-excited and charge-transferred (CT) state of the S1 excited state were separated due to high temporal (<50 fs) and spectral (<10 cm−1) resolutions of femtosecond stimulated Raman spectroscopy. The ultrafast (0.6–0.8 ps) ICT and subsequent vibrational relaxation (6–9 ps) in the CT state were ubiquitously observed in the ground- and excited-state vibrational modes of the solute curcumin and the νCSC and νS=O modes of solvent DMSO. The ICT of curcumin in the excited state was preceded by the disruption of the solvation shells, including the breakage of hydrogen bonding between curcumin and DMSO molecules, which occurs at the ultrafast (20–50 fs) time scales. View Full-Text
Keywords: intramolecular charge transfer; excited-state dynamics; solvation dynamics; femtosecond stimulated Raman spectroscopy; hydrogen bonding intramolecular charge transfer; excited-state dynamics; solvation dynamics; femtosecond stimulated Raman spectroscopy; hydrogen bonding
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MDPI and ACS Style

Jen, M.; Lee, S.; Lee, G.; Lee, D.; Pang, Y. Intramolecular Charge Transfer of Curcumin and Solvation Dynamics of DMSO Probed by Time-Resolved Raman Spectroscopy. Int. J. Mol. Sci. 2022, 23, 1727. https://doi.org/10.3390/ijms23031727

AMA Style

Jen M, Lee S, Lee G, Lee D, Pang Y. Intramolecular Charge Transfer of Curcumin and Solvation Dynamics of DMSO Probed by Time-Resolved Raman Spectroscopy. International Journal of Molecular Sciences. 2022; 23(3):1727. https://doi.org/10.3390/ijms23031727

Chicago/Turabian Style

Jen, Myungsam, Sebok Lee, Gisang Lee, Daedu Lee, and Yoonsoo Pang. 2022. "Intramolecular Charge Transfer of Curcumin and Solvation Dynamics of DMSO Probed by Time-Resolved Raman Spectroscopy" International Journal of Molecular Sciences 23, no. 3: 1727. https://doi.org/10.3390/ijms23031727

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