Excited state intramolecular proton transfer mechanism of o-hydroxynaphthyl phenanthroimidazole
Liu Shuang1, Ma Yan-Zhen2, Yang Yun-Fan2, Liu Song-Song1, Li Yong-Qing2, †, Song Yu-Zhi1, ‡
       

(color online) Optimized structures of HNPI molecules of enol and keto forms in S0 state: blue: H, yellow: C, red: O, pink: N. The dash line refers to the intramolecular hydrogen bond.