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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Magnetic properties and structure of tetranuclear lanthanide complexes based on 8-hydroxylquinoline Schiff base
Hong-Ling Gao1, Shao-Xia Huang, Xiao-Pu Zhou
1Department of Chemistry, Tianjin University, Tianjin 300354, P. R. China. cuijianzhong@tju.edu.cn ghl@tju.edu.cn.
Abstract:
Five tetranuclear lanthanide complexes [Gd4(dbm)4(L)6(μ3-OH)2]·5CH3CN (1), [Tb4(dbm)4(L)6(μ3-OH)2]·2CH3CH2OH·4CH3CN (2), [Dy4(dbm)4(L)6(μ3-OH)2]·4CH3CN·2H2O (3), [Ho4(dbm)4(L)6(μ3-OH)2]·CH3CH2OH·4CH3CN·2H2O (4) and [Er4(dbm)4(L)6(μ3-OH)2] (5) are obtained from the reaction of 5-(4-pyridinecarboxaldehyde)amino-8-hydroxylquinoline (HL) and Ln(dbm)3·2H2O (dbm = 1,3-diphenyl-1,3-propanedione). Complexes 1-5 are isomorphous and crystallize in the monoclinic space group P21/c. The metal ions in 1-5 adopt an approximately square-antiprismatic coordination environment. Magnetic studies indicate that complex 1 features a magnetocaloric effect (MCE) with the magnetic entropy change of -ΔSm(T) = 16.35 J kg-1 K-1 at 3 K for ΔH = 7 T. Additionally, complex 3 displays single molecule magnet (SMM) behavior, exhibiting an effective energy barrier of the relaxation of magnetization Ueff/kB = 89.38 K and pre-exponential factor τ0 = 3.32 × 10-8 s.
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