Kuo‐Chun Tang, Chyi-Lin Chen, Hsiao‐Han Chuang
Nov 28, 2011
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Journal of Physical Chemistry Letters
Abstract
7-Hydroxyquinoline-8-carboxylic acid (1), which possesses dual intramolecular hydrogen bonds, undergoes excited-state intramolecular double proton transfer, (ESIDPT) resulting in a quinolinone-like tautomer emission (λmax ∼ 470 nm). ESIDPT of 1 is cooperative, as evidenced by chemically blocking either proton donating site. While the overall rate of ESIDPT is higher than the system response limit, (220 fs)–1, the theoretical approach favors a concerted, asynchronous ESIDPT with a rather small or negligible barrier, demonstrating an intrinsic proton relay system that undergoes intramolecular double proton transfer in the electronic excited state.