1. Contribution from the Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China, State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, Xiamen University, Xiamen 361005, China, Leibniz-Institut für Festkörper- and Werkstofforschung, Helmholtzstrasse 20, D-01171 Dresden, Germany, and Department of Chemistry and Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan