Switching the Local Symmetry from D5h to D4h for Single-Molecule Magnets by Non-Coordinating Solvents

Inorganics

Xu-Feng Zhang¹  Yi Lv¹  Chao Ke²  Xinliang Zhang³  Yan-Zhen Zheng⁴  Yuan-Qi Zhai⁴  Qian-Cheng Luo⁴  Xia-Li Ding⁴  Qian Zhang⁵  Lei Tian⁶ 

[1] Department of Hepatobiliary Surgery, The First Affiliated Hospital of Xi’an Jiaotong University, 277 West Yanta Road, Xi’an 710061, China;Department of Orthopaedic Trauma, Honghui Hospital, College of Medicine, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710054, China;Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, 76 Nanguo Road, Xi’an 710054, China;Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University Shenzhen Research School, State Key Laboratory for Mechanical Behavior of Materials, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi’an Key Laboratory of Sustainable Energy and Materials Chemistry, School of Chemistry and School of Physics, 99 Yanxiang Road, Xi’an 710054, China;State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Department of General Dentistry and Emergency, School of Stomatology, Air Force Medical University, 169 West Changle Road, Xi’an 710032, China;State Key Laboratory of Military Stomatology, National Clinical Research Center of Oral Diseases, Shaanxi Key Laboratory of Oral Diseases, Department of Cranio-facial Trauma and Orthognathic Surgery, School of Stomatology, The Fourth Military Medical University, 145 West Changle Road, Xi’an 710032, China;

关键词: dysprosium;    local symmetry;    single-molecule magnets;    magnetic relaxation;    solvent effect;   

DOI  :  10.3390/inorganics9080064

来源: DOAJ

【 摘 要 】

A solvent effect towards the performance of two single-molecule magnets (SMMs) was observed. The tetrahydrofuran and toluene solvents can switch the equatorial coordinated 4-Phenylpyridine (4-PhPy) molecules from five to four, respectively, in [Dy(O^tBu)₂(4-PhPy)₅]BPh₄1 and Na{[Dy(O^tBu)₂(4-PhPy)₄][BPh₄]₂}∙2thf∙hex 2. This alternation significantly changes the local coordination symmetry of the Dy(III) center from D_5h to D_4h for 1 and 2, seperately. Magnetic studies show that the magnetic anisotropy energy barrier of 2 is higher than that of 1, while the relation of blocking temperature is just on the contrary due to the symmetry effect. The calculations of the electrostatic potential successfully explained the driving force of solvents for the molecular structure change, confirming the feasibility of adjusting the performance of SMMs via diverse solvents.

【 授权许可】

Unknown