Macrocyclic Hexagonal Bipyramidal Dy(III)-Based Single-Molecule Magnets with a D 6h Symmetry

作者：Jia, Shuwen; Zhu, Xinrui; Yin, Bing^*; Dong, Yubao; Sun, Ao; Li, Dong-feng^*

来源：Crystal Growth and Design, 2023, 23(9): 6967-6973.

DOI：10.1021/acs.cgd.3c00813

• ZERO-FIELD
• ION
• RELAXATION
• MAGNETIZATION
• ANISOTROPY
• BARRIER
• AXIALITY
• REVERSAL
• BEHAVIOR
• MEMORY

An air-stable Dy-III complexwith a hexagonalbipyramid D (6h) symmetry derived of a neutralhexaaza macrocyclic Schiff base ligand shows zero-field single-moleculemagnet behavior with an open magnetic hysteresis loop up to 13 K andthe effective barrier of 584 K. @@@ Thedesign and synthesis of air-stable single-molecule magnets(SMMs) with large effective barriers of magnetic reversal and remarkablyslow relaxation times are challenging. The design and synthesis ofair-stable complexes with large effective magnetic reversal barriersand remarkably slow relaxation times are challenging in the fieldof SMMs. Herein, we present an air-stable hexagonal bipyramid [Dy-III(bpyN4)(Ph3SiO)(2)](BPh4)(1) (bpyN4 = neutral hexaaza macrocyclic Schiff baseligand derived of 6,6 & PRIME;-diformyl-2,2 & PRIME;-bipyridyl and triethylenetetramine).The magnetic data demonstrate that the complex shows zero-field SMMbehavior with magnetic hysteresis loops up to 13 K and an effectivebarrier of 584 K for 1. The experimental effective barrieris close to the energy of the first excited Kramers doublet (E (KD1)) obtained from ab initio calculations.

• 单位
  西北大学