Modulating the magnetization dynamics of four phenoxo-O bridged Dy2 complexes based on a Schiff base derived from 8-hydroxyquinoline

作者：Wu, Dong-Fang; Shen, Hai-Yun; Chu, Xiao-Ya; Chang, Wen-Ju; Zhao, Li-Hua; Duan, Yao-Yao; Chen, Huan-Huan; Cui, Jian-Zhong^*; Gao, Hong-Ling^*

来源：New Journal of Chemistry, 2018, 42(20): 16836-16845.

DOI：10.1039/c8nj02888e

• SINGLE-MOLECULE MAGNET
• LANTHANIDE(III) DINUCLEAR COMPLEXES
• SLOW RELAXATION PROCESSES
• ION MAGNETS
• DYSPROSIUM LAYER
• GUEST MOLECULES
• BEHAVIOR
• LIGAND
• ANISOTROPY
• TETRANUCLEAR

Four novel -O bridged dinuclear Dy-2 clusters have been synthesized successfully by utilizing an 8-hydroxyquinoline (8-HQ) Schiff base ligand and four different co-ligands: [Dy-2(bfa)(2)(L)(2)(H2O)(2)]4CH(3)OH (1), [Dy-2(TTA)(2)(L)(2)(H2O)(2)]4CH(3)OH (2), [Dy-2(acac)(2)(L)(2)(H2O)(2)]2H(2)O (3) and [Dy-2(PhCOO)(2)(L)(2)(H2O)(2)] (4) (Hbfa = benzoyl trifluoroacetylacetone, HTTA = thiophene trifluoroacetylacetone, Hacac = acetylacetone, PhCOOH = benzoic acid, H2L = 2-[(4-pyridinebenzoylhydrazone)methyl]-8-hydroxyquinoline). Magnetic studies show that only complex 1 exhibits SMM behavior under a zero dc field with a magnetic relaxation barrier of 68.89 K. When a dc field of 1500 Oe is applied, the value of E/k(B) increases to 72.63 K. The different dynamic magnetic behaviors of the four Dy-2 complexes mainly originate from the tiny changes of the coordination environment and magnetic coupling interaction of the central ions caused by the different co-ligands. Meanwhile, it proves that the co-ligands play an important role in modulating the magnetic properties of Dy-SMMs based on 8-HQ derivatives.

• 出版日期2018-10-21
• 单位南开大学; 天津大学