title: Dinuclear dysprosium SMMs bridged by a neutral bipyrimidine ligand: two crystal systems that depend on different lattice solvents lead to a distinct slow relaxation behaviour.
abstract: Two dinuclear dysprosium complexes with the Dy(iii) ions bridged by the neutral bipyrimidine (BPYM) ligand were synthesized and magnetically characterized. They crystallized in a monoclinic and triclinic crystal system, respectively, with almost the same structural core, only differing in the lattice solvent molecules. Alternating current (ac) susceptibility measurements revealed that they exhibit significant slow relaxation of magnetization until 25 K in the absence of a dc field. The single and double relaxation processes were assigned to one and two types of Dy(iii) environments in the two dimmers, respectively, with barriers of 266 and 345 K under zero field conditions. The magnetic hysteresis loops of 1 and 2 were both observed up to 2.5 K.
authors.affiliation: Beijing National Laboratory of Molecular Science State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. wangbw@pku.edu.cn gaosong@pku.edu.cn.
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Sun
authors.forename: Bing
authors.initials: B
authors.lastname: Yan
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Jia
authors.forename: Bing-Wu
authors.initials: BW
authors.lastname: Wang
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.forename: Xin
authors.initials: X
authors.lastname: Cheng
authors.forename: Hong-Feng
authors.initials: HF
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.forename: Zhe-Ming
authors.initials: ZM
authors.lastname: Wang
authors.forename: Song
authors.initials: S
authors.lastname: Gao