1. Institute of Organic Chemistry, Shanxi Normal University, Gongyuan Street 1, Linfen, Shanxi Province 041004, People′s Republic of China
2. School of Chemical and Materials Science, Shanxi Normal University, Gongyuan Street 1, Linfen, Shanxi Province 041004, People′s Republic of China
3. Key Laboratory of Magnetic Molecules and Magnetic Information Material, Ministry of Education, People′s Republic of China
4. Institut für Anorganische Chemie der Universität Göttingen, Tammannstrasse 4 37077, Göttingen, Germany