1. Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, P.R. China
2. Department of Chemistry, Youngstown State University, One University Plaza, Youngstown, Ohio 44555, United States
3. CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, 33600 Pessac, France
4. Université de Bordeaux, UPR 8641, Pessac F-33600, France
5. CNRS UPR9048, Université Bordeaux, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 87 avenue du Dr. Albert Schweitzer, Pessac Cedex, F-33608, France
6. Department of Chemistry and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China