Citation: Qin, Xiao; Ni, Xin-Long; Hu, Jing-Xu; Chen, Kai; Zhang, Yun-Qian; Redshaw, Carl; Zhu, Qian-Jiang; Xue, Sai-Feng; Tao, Zhu (2013). Macrocycle-based metal ion complexation: a study of the lanthanide contraction effect towards hexacyclohexanocucurbit[6]uil. CrystEngComm, 15, pp. 738-.