title: A single-molecule magnet featuring a parallelogram [Dy4(OCH2-)4] core and two magnetic relaxation processes.
abstract: An alkoxido-bridged tetranuclear Dy(iii) complex, [Dy4(H3L)2(OAc)6]·2EtOH {, H6L = 1,3-bis[tris(hydroxymethyl)methylamino]propane}, has been solvothermally synthesized and characterized. An X-ray crystallographic study revealed that complex possesses a novel "parallelogram" [Dy4(OCH2-)4] core, and a new binding mode η(3):η(3):η(1):η(1):η(1):η(2):μ(4) of the Bis-tris propane ligand was observed. Magnetic investigations indicated that it is a single-molecule magnet (SMM), showing two distinct magnetic relaxation processes with the energy barriers of 44 K and 107 K, respectively. Such a two-step magnetic relaxation process could be well described by the sum of two modified Debye functions.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Center for Molecular Science, Institute of Chemistry, Key Laboratory of Organic Solids, Chinese Academy of Sciences, Beijing 100190, P. R. China. cmliu@iccas.ac.cn.
authors.forename: Cai-Ming
authors.initials: CM
authors.lastname: Liu
authors.forename: De-Qing
authors.initials: DQ
authors.lastname: Zhang
authors.forename: Dao-Ben
authors.initials: DB
authors.lastname: Zhu