New Journal of Chemistry p. 11847 - 11853 (2018)
Update date:2022-08-11
Topics:
Fang, Ming
Shao, Li-Jun
Shi, Tian-Xing
Chen, Ying-Ying
Yu, Hong
Li, Peng-Fei
Wang, Wen-Min
Zhao, Bin
Four tetra-nuclear lanthanide complexes: {[Ln4(L)6(tmhd)4(μ3-OH)2]·mH2O} (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 P21/n. The cores of the complexes contain a tetranuclear arrangement of LnIII ions, which is bridged by the two pyramidal μ3-OH- ions, and the four LnIII ions are precisely coplanar. The magnetic study reveals that 1 exhibits cryogenic magnetic refrigeration property (-ΔSm = 20.85 J K-1 kg-1), whereas compound 3 exhibits slow relaxation of the magnetization.
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