Affiliation:
1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 China
2. College of Chemical Engineering Guizhou University of Engineering Science Bijie 551700 China
3. Laboratory of Nuclear Energy Chemistry Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China
Abstract
AbstractTwo five‐coordinate mononuclear DyIII single‐molecule magnets [(TrapenTMS)Dy(L)] (Trapen=tris(2‐aminobenzyl) amine; TMS=SiMe3; L=OPMe3 1, OPEt3 2) have been synthesized by the reaction of [(TrapenTMS)Dy(THF)] and OPMe3, OPEt3, respectively. The molecular structures of 1 and 2 were fully established by single crystal X‐ray diffraction. The centre DyIII ions of both complexes exhibit distorted triangular bipyramid geometries, varying with different neutral ligands L on the apex. The TrapenTMS ligand forms the pyramid base of the trigonal bipyramid. Subtle structural modifications of the axial O‐ligand terminal substituent result in different dynamic magnetic behaviors. Magnetic data analysis reveals that 1 and 2 exhibit the characteristic behavior of SMM without a dc field, accompanying an unambiguous quantum tunneling of the magnetization. Field‐induced slow magnetic relaxation was observed for 1 and 2 under an applied bias dc field of 1000 Oe, the relaxation energy barriers are 107 K and 88 K for 1 and 2, respectively. We have investigated the differences in magnetism and magnetic anisotropy between the two complexes by ab initio calculations.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
China Postdoctoral Science Foundation
Natural Science Foundation of Ningxia Province
Cited by
1 articles.
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