title: Probing the magnetic relaxation and magnetic moment arrangement in a series of Dy4squares.
abstract: Three μ4-O bridged Dy4squares, {[Dy4(μ4-O)(HL1)4(H2O)4]2(NO3)3(OH)}·2H2O·2CH3OH (1), [Dy4(μ4-O)(HL2)4(SCN)2]·2H2O·4CH3OH (2) and [Dy4(μ4-O)(H2L3)2(SCN)2]·6H2O (3) were assembled by using a Schiff base ligand and its dimerized and reduced congener, respectively. These complexes share a similar μ4-O bridged Dy4core, while, both the coordination geometry and metal-ligand interactions are slightly changed upon the modulation of the ligands, resulting in distinct single-molecular magnetic (SMM) and single-molecular toroic (SMT) properties. In complex 1, the Schiff base ligands are in an antiparallel fashion and all DyIIIions are in a similar coordination geometry, realizing the toroidal arrangement of magnetic moments. For complex 2, the reduced ligand H3L2in a parallel fashion results in double relaxation processes and a 9-fold increase of the Ueff. Interestingly, with the use of the dimerized ligand H6L3, we obtained complex 3, which is similar to complex 2, while due to the slight changes of the coordination environment both the single molecular magnetic property and toroidal magnetic moments almost disappeared.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn and University of Chinese Academy of Sciences, Beijing, 100039, P. R. China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn.
authors.forename: Shuang-Yan
authors.initials: SY
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn.
authors.forename: Si
authors.initials: S
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn.
authors.forename: Xiao-Lei
authors.initials: XL
authors.lastname: Li
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn.
authors.forename: Lang
authors.initials: L
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn and University of Chinese Academy of Sciences, Beijing, 100039, P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. tang@ciac.ac.cn.
authors.forename: Jinkui
authors.identifier: http://orcid.org/0000-0002-8600-7718
authors.initials: J
authors.lastname: Tang