A Dy4 single-molecule magnet and its Gd((III)), Tb((III)), Ho((III)), and Er((III)) analogues encapsulated by an 8-hydroxyquinoline Schiff base derivative and a-diketonate coligand

作者：Gao, Hong-Ling^*; Zhou, Xiao-Pu; Bi, Yan-Xia; Shen, Hai-Yun; Wang, Wen-Min; Wang, Ni-Ni; Chang, Yi-Xin; Zhang, Ru-Xia; Cui, Jian-Zhong

来源：Dalton Transactions, 2017, 46(14): 4669-4677.

DOI：10.1039/c7dt00118e

• LANTHANIDE(III) DINUCLEAR COMPLEXES
• SLOW RELAXATION
• 2-STEP RELAXATION
• CRYSTAL-STRUCTURE
• SMM BEHAVIOR
• MAGNETIZATION
• TETRANUCLEAR
• CLUSTER
• LN
• LIGAND

Five new tetranuclear complexes based on an 8-hydroxyquinoline Schiff base derivative and the beta-diketone coligand, [Ln(4)(acac) L-4(6)(mu(3)-OH)(2)].CH3CN.0.5CH(2)Cl(2) (Ln = Gd (1), Tb (2), Dy (3), Ho (4) and Er (5); HL = 5-(benzylidene) amino-8-hydroxyquinoline; acac = acetylacetonate) have been synthesized, and structurally and magnetically characterized. Complexes 1-5 have similar tetranuclear structures. Each LnIII ion is eight coordinated and its coordination polyhedra can be described as being in a distorted squareantiprismatic geometry. The magnetic studies reveal that 1 features the magnetocaloric effect (MCE) with the magnetic entropy change of -Delta S-m(T) = 25.08 J kg(-1) K-1 at 2 K for Delta H = 7 T, and 3 displays the slow magnetic relaxation behavior of Single Molecule Magnets (SMMs) with the anisotropic barrier of 86.20 K and the pre-exponential factor t0 = 2.99 x 10 (8) s.

• 出版日期2017-4-14
• 单位天津大学; 南开大学