title: A series of lanthanide-organic polymers incorporating nitrogen-heterocyclic and aliphatic carboxylate mixed-ligands: structures, luminescent and magnetic properties.
abstract: Seven new lanthanide-organic coordination polymers incorporating both nitrogen heterocyclic dicarboxylate and various auxiliary ligands, {[Ln(3)(Hpimda)(4)(mu(2)-HCOO).5H(2)O].H(2)O}(n)} Ln = Sm (1), Ln = Eu (2), Ln = Gd (3), Ln = Dy (4), Ln = Ho (5), {[Ce(2)(Hpimda)(2)(mu(4)-C(2)O(4)).8H(2)O].2H(2)O}(n) (6), {[Yb(2)(pyda)(mu(4)-C(2)O(4))(2).4H(2)O].3H(2)O}(n) (7) (H(3)pimda = 1H-2-propyl-4,5-imidazoledicarboxylic acid, H(2)pyda = 2,6-pyridinedicarboxylic acid) have been fabricated successfully and characterized systematically. Complexes 1-5 are isomorphous and isostructural, and are built from two-dimensional (2-D) double-decker networks based on the tetranuclear basic carboxylate as a secondary building unit (SBU). Both polymers 6 and 7 feature a (3,4)-connected 3-D framework consisting of 2-D lanthanide-organic hexagonal grids, which are further interlinked via the mu(4)-oxalate ligand. The results of magnetic determination show the same end-to-end bridging fashion of formate group results in different magnetic properties occurring between lanthanide centers. The luminescence emission spectra of the complexes vary depending on the lanthanide ion present.
authors.affiliation: College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, 471022, P. R. China.
authors.forename: Xun
authors.initials: X
authors.lastname: Feng
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Li-Ya
authors.initials: LY
authors.lastname: Wang
authors.forename: Jian-She
authors.initials: JS
authors.lastname: Zhao
authors.forename: Jian Ge
authors.initials: JG
authors.lastname: Wang
authors.forename: Ng Seik
authors.initials: NS
authors.lastname: Weng
authors.forename: Xin-Ge
authors.initials: XG
authors.lastname: Shi