Template-Free Synthesis of a Phenanthroline-Containing [2]Rotaxane: A Reversible pH-Controllable Molecular Switch. - Masahiro Muraoka; Kakeru Aoyama; Sae Fujihara; Risa Yamane; Ichiro Hisaki; Mikiji Miyata; Michihisa Murata; Yohji Nakatsuji (Symmetry, 2019)