1. Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou University Guangdong 515063 China
2. Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515031 China
3. College of Chemistry Nankai University Tianjin 300071 China
4. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan Key Laboratory of Magnetic Resonance in Biological Systems Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China