Abstract
Abstract In this study, a range of organic dyes were prepared to investigate difference between five- and six- number-membered ring transition states for internal proton transfer in excited state. Different strength intramolecular hydrogen bond in the target dyes was demonstrated by X-ray crystallography, 1 H NMR spectroscopy and ultraviolet/visible spectroscopy. The fluorescence measurement suggested excited state intramolecular proton transfer occurred via six number-membered ring transition state, while it could not occur through five number-membered ring transition state. The molecular geometry optimization of the target dyes further accounted for the difference of internal proton transfer in excited state occurred by five- or six- number-membered ring transition state.
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