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Ultrafast Dynamics of a Solvatochromic Dye, Phenol Blue: Tautomerization and Coherent Wavepacket Oscillations.
Ota, Chikashi; Matsumoto, Akifumi; Hidaka, Tsubasa; Sugihara, Keita; Teramoto, Takahiro; Nagasawa, Yutaka.
Afiliación
  • Ota C; Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
  • Matsumoto A; Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
  • Hidaka T; Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
  • Sugihara K; Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
  • Teramoto T; Institute for Radiation Sciences, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
  • Nagasawa Y; Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
J Phys Chem B ; 125(38): 10832-10842, 2021 09 30.
Article en En | MEDLINE | ID: mdl-34543033
Femtosecond time-resolved transient absorption spectroscopy was performed for a nonfluorescent solvatochromic dye, phenol blue, N-(4-dimethylaminophenyl)-1,4-benzoquinoneimine, which exhibits ultrafast nonradiative decay due to its flexible molecular structure. By exciting the molecule in ethanol (EtOH) solution with two excitation wavelengths located at shorter- and longer-wavelength sides of the visible absorption band, we observed ultrafast nonradiative decay from the excited state, followed by spectral evolution in the ground state. The nonradiative decay in the subpicosecond range creates a vibrationally hot ground state with the lifetime in the picosecond range. Subsequently, a tautomer that absorbs at shorter wavelengths is produced from the hot state, which causes a red shift of the ground-state bleach (GSB). The tautomerization presumably involves twisting of the benzoquinoneimine moiety induced by the breaking of the hydrogen bond (H-bond) between the solute and the solvent molecules. The recombination of the H-bond occurs with a time constant of ∼30 ps, and the system returns to its original state. We also observed low-frequency coherent wavepacket oscillations that modulate the GSB with dephasing times similar to the excited-state lifetime.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Benzoquinonas / Compuestos de Anilina Idioma: En Revista: J Phys Chem B Asunto de la revista: QUIMICA Año: 2021 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Benzoquinonas / Compuestos de Anilina Idioma: En Revista: J Phys Chem B Asunto de la revista: QUIMICA Año: 2021 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos