title: A series of tetranuclear lanthanide complexes comprising two edge-sharing triangular units with field-induced slow magnetic relaxation for Dy4 species.
abstract: The syntheses, crystal structures and magnetic studies are reported for a series of Ln(4) clusters formulated as Ln(4)(μ(3)-OH)(2)(php)(2)(OAc)(6)(H(2)O)(2)]·4MeOH·nH(2)O (Ln = Gd (1), Tb (2), Dy (3) (n = 2) and Ho (4) (n = 0); H(2)php = 2,6-(picolinoylhydrazone)pyridine). The overall metal core of each cluster is comprised of two edge-sharing triangular Ln(3) units linked by μ(3)-OH bridges. Direct-current (dc) magnetic susceptibility studies reveal that the Ln(III) ions are very weakly coupled in all four compounds. Alternating-current (ac) magnetic susceptibility studies for 3 indicate that field-induced slow relaxation phenomenon occurs for this compound.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
authors.forename: Shufang
authors.initials: S
authors.lastname: Xue
authors.forename: Lang
authors.initials: L
authors.lastname: Zhao
authors.forename: Yun-Nan
authors.initials: YN
authors.lastname: Guo
authors.forename: Ruiping
authors.initials: R
authors.lastname: Deng
authors.forename: Yang
authors.initials: Y
authors.lastname: Guo
authors.forename: Jinkui
authors.initials: J
authors.lastname: Tang