Excited State Proton Transfer of Quinone Cyanine 9: Implications on the Origin of Super-Photoacidity
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- Title
- Excited State Proton Transfer of Quinone Cyanine 9: Implications on the Origin of Super-Photoacidity
- Authors
- Lee, Changmin; Chung, Seyoung; Song, Hayoung; Rhee, Young Min; Lee, Eunsung; Joo, Taiha
- Date Issued
- 2021-03
- Publisher
- WILEY-V C H VERLAG GMBH
- Abstract
- Quinone cyanine 9 (QCy9) is one of the strongest photoacids known to date. The origin of "super"-photoacidity was investigated via time-resolved fluorescence (TF) with high time resolution to accurately resolve the ultrafast dynamics of the excited-state proton transfer (ESPT) to solvent. The ESPT of QCy9 in water is found to proceed fully by two ultrafast time constants of 40 fs (65 %) and 200 fs (35 %). More importantly, the initially created base form of QCy9 in the excited state undergoes a significant dynamic red shift of over 2700 cm(-1) by solvation. We suggest that the entirely ultrafast reaction rate and the massive solvation of the conjugate base could make QCy9 a particularly strong photoacid. Quantum chemical calculations show that structural diversity leads to the nonexponential behavior of the ESPT dynamics.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106690
- DOI
- 10.1002/cptc.202000254
- ISSN
- 2367-0932
- Article Type
- Article
- Citation
- CHEMPHOTOCHEM, vol. 5, no. 3, page. 245 - 252, 2021-03
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