Excited state intramolecular proton transfer mechanism of o-hydroxynaphthyl phenanthroimidazole

Liu Shuang¹, Ma Yan-Zhen², Yang Yun-Fan², Liu Song-Song¹, Li Yong-Qing^{2, †}, Song Yu-Zhi^{1, ‡}

(color online) (a) Plot of reduced density gradient (RDG) versus for function value 1 and function value 2. (b) Different types of weak interactions represented by different color gradients as well as RDG isometric surfaces.