1. Key Laboratory of Magnetic Molecules & Magnetic Information Materials of the Ministry of Education, School of Chemistry & Material Science Shanxi Normal University Taiyuan Shanxi 030031 China
2. Weinan Bureau of Natural Resources and Planning Weinan Shaanxi 714000 China
3. Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology Nanjing Normal University Nanjing Jiangsu 210023 China
4. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico‐Inorganic Chemistry College of Chemistry and Materials Science Northwest University, Xi'an, Shaanxi 710127 China