title: Polyoxometalate (W/Mo) compounds connected via lanthanide cations with a three-dimensional framework, H2{[K(H2O)2]2[Ln(H2O)5]2(H2M12O42)}.nH2O: synthesis, structures, and magnetic properties.
abstract: A series of 10 novel polyoxometalate (W/Mo) compounds connected via a trivalent lanthanide cation bridge, H2{[K(H2O)2]2[Ln(H2O)5]2(H2M12O42)}.n(H2O) (Ln = La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu; M = W or W/Mo) (1-10), were designed and synthesized on the basis of the abduction of Al3+ in aqueous solution. X-ray diffraction analyses reveal that the structures of complexes 1-10 are three-dimensional frameworks assembled from the arrangement of H2M12O42(10-) (named paradodecmetalate-B) and Ln(H2O)53+ with two planes, which are constructed via the unification of H2M12O42(10-) and Ln(H2O)53+, along the [100] and [001] directions. Magnetic measurements reveal the paramagnetic properties and a strong ferromagnetic coupling between the two nearest-neighboring lanthanide cations, Ln3+ (Ln = Dy, Er), within the circle for compounds 2 and 4-9.
authors.affiliation: Department of Chemistry, Shandong University, Jinan 250100, China, Department of Chemistry, Liaocheng University, Liaocheng 252000, China, and Department of Physics, Shandong University, Jinan 250100, China.
authors.forename: Xiutang
authors.initials: X
authors.lastname: Zhang
authors.forename: Daqi
authors.initials: D
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Dou
authors.forename: Shishen
authors.initials: S
authors.lastname: Yan
authors.forename: Xinxin
authors.initials: X
authors.lastname: Yao
authors.forename: Jianzhuang
authors.initials: J
authors.lastname: Jiang