Citation: Fu, Kai; Ren, Cai-Xia; Chen, Cheng; Cai, Li-Xuan; Tan, Bin; Zhang, Jie (2014). Auxiliary ligand-controlled photochromism and decolourization of two bipyridinium-based metal--organic hybrid materials with various water clusters. CrystEngComm, 16, pp. 5134-.