Seven phenoxido-bridged complexes encapsulated by 8-hydroxyquinoline Schiff base derivatives and β-diketone ligands: single-molecule magnet, magnetic refrigeration and luminescence properties

Dalton Transactions : an International Journal of Inorganic Chemistry
Shi-Yu WangHong-Ling Gao

Abstract

Seven dinuclear complexes based on 8-hydroxyquinoline Schiff base derivatives and β-diketone ligands, [RE2(hfac)4L2] (RE = Y (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6) and Lu (7); hfac(-) = hexafluoroacetylacetonate; HL = 2-[(4-chloro-phenylimino)-methyl]-8-hydroxyquinoline), have been synthesized, and structurally and magnetically characterized. Complexes 1-7 have similar dinuclear structures, in which each RE(III) ion is eight coordinated by two L(-) and two hfac(-) ligands in a distorted dodecahedron geometry. The luminescence spectra indicate that complex 3 exhibits characteristic Tb(III) ion luminescence, while 1 and 7 show HL ligand luminescence. The magnetic studies reveal that 2 features a magnetocaloric effect with the magnetic entropy change of -ΔSm = 16.83 J kg(-1) K(-1) at 2 K for ΔH = 8 T, and 4 displays slow magnetic relaxation behavior with the anisotropic barrier of 6.7 K and pre-exponential factor τ0 = 5.3 × 10(-6) s.

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Citations

Nov 20, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Ru-Xia ZhangHong-Ling Gao
Oct 16, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Yaru QinYi-Quan Zhang
Jan 19, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Berta CasanovasLorenzo Di Bari
Nov 16, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Marek MachataZdeněk Trávníček
Nov 18, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhong-Yi LiGuang-Xiu Cao
Feb 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Hong-Ling GaoJian-Zhong Cui

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