1. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012 (P. R. China)
2. C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506 (USA)
3. Steacie Institute for Molecular Sciences, NRC Canada, Ottawa, Ontario, K1 A0R6 (Canada)