Four tetra-nuclear lanthanide complexes based on 8-hydroxyquinolin derivatives: magnetic refrigeration and single-molecule magnet behaviour

作者：Fang, Ming^*; Shao, Li-Jun; Shi, Tian-Xing; Chen, Ying-Ying; Yu, Hong; Li, Peng-Fei; Wang, Wen-Min^*; Zhao, Bin^*

来源：New Journal of Chemistry, 2018, 42(14): 11847-11853.

DOI：10.1039/c8nj02161a

• METAL-ORGANIC FRAMEWORKS
• ION MAGNET
• DY-III
• RELAXATION
• LN
• LIGAND
• GD
• HYDROGEN
• CAGES
• ANISOTROPY

Four tetra-nuclear lanthanide complexes: {[Ln(4)(L)(6)(tmhd)(4)((3)-OH)(2)]mH(2)O} (Ln = Gd (1, m = 0), Tb (2, m = 3), Dy (3, m = 0), Ho (4, m = 0); L = 5-((pyridin-4-ylmethylene)amino)quinolin-8-ol, tmhd = 2,2,6,6-tetramethylheptane-3,5-dione) were fabricated and structurally characterized. Compounds 1-4 are isostructural and belong to the monoclinic system with space group P2(1)/n. The cores of the complexes contain a tetranuclear arrangement of Ln(III) ions, which is bridged by the two pyramidal (3)-OH- ions, and the four Ln(III) ions are precisely coplanar. The magnetic study reveals that 1 exhibits cryogenic magnetic refrigeration property (-S-m = 20.85 J K-1 kg(-1)), whereas compound 3 exhibits slow relaxation of the magnetization.

• 出版日期2018-7-21
• 单位河北科技师范学院; 太原师范学院; 南开大学