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Transient absorption spectroscopy of a twisted intramolecular charge transfer (TICT) state in a DCM molecule analyzed by isosbestic points

  • Original Paper - Atoms, Molecules and Optics
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Abstract

An organic dye molecule, 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), was investigated by UV-pump/visible-probe transient absorption spectroscopy with populating the S2 state in a twisted conformation of an electron donor, which is responsible for a twisted intramolecular charge transfer (TICT) excited state. We observed the formation and completion of a TICT state from the spectral change of a temporary isosbestic point. The solvation relaxation (~ 3 ps) of the TICT state was estimated, which is shorter than that of the intramolecular charge transfer (ICT) state (~ 10 ps). The isosbestic points were shifted in the excited-state dynamics of the TICT state toward a red wavelength region and in that of the ICT state toward the blue region with a different temporal range of times. This study presented the photoinduced dynamics of an emissive intermediate TICT state showing the spectral change of isosbestic points in ultrafast time-resolved transient absorption spectroscopy.

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Funding

This work was supported by grants from the “Ultra-short Quantum Beam Facility Program” and “GIST Research Institute Program” provided by Gwangju Institute of Science and Technology in 2022.

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Authors and Affiliations

  1. Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea

    Terry Park, Ingu Lee, Seong-Jin Son, Youngbin Na & Do-Kyeong Ko

  2. Research Center for Photon Science Technology, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea

    Terry Park, Seong-Jin Son, Youngbin Na & Do-Kyeong Ko

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  1. Terry Park
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Correspondence to Do-Kyeong Ko.

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Park, T., Lee, I., Son, SJ. et al. Transient absorption spectroscopy of a twisted intramolecular charge transfer (TICT) state in a DCM molecule analyzed by isosbestic points. J. Korean Phys. Soc. 80, 585–591 (2022). https://doi.org/10.1007/s40042-022-00461-7

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  • DOI: https://doi.org/10.1007/s40042-022-00461-7

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