title: Synthesis, characterization, and properties of organically templated lanthanide oxalatophosphates with a three-dimensional honeycomb structure: (H4APPIP)[Ln3(C2O4)(5.5)(H2PO4)2].5H2O (Ln = Er-Lu, APPIP = 1,4-bis(3-aminopropyl)piperazine).
abstract: Four isostructural organically templated lanthanide oxalatophosphates, (H(4)APPIP)[Ln(3)(C(2)O(4))(5.5)(H(2)PO(4))(2)].5H(2)O (Ln = Er-Lu and APPIP = 1,4-bis(3-aminopropyl)piperazine), have been synthesized under hydrothermal conditions and characterized by single-crystal and powder X-ray diffraction. Their structures contain LnO(8) trigonal dodecahedra linked by three bis-bidentate oxalates to form layers in the (102) plane, which are connected by dihydrogen phosphate and bis-monodentate oxalate ligands to form a 3D framework. The charge-compensating tetraprotonated 1,4-bis(3-aminopropyl)piperazinium cations and lattice water molecules are located in the 12-membered ring straight channels. They are the first examples of organically templated lanthanide oxalatophosphates. The thermal stability, guest desorption-sorption properties, variable-temperature in situ powder X-ray diffraction, magnetic susceptibility, and photoluminescence spectrum of the Er compound and catalytic activity of the Yb compound for the Biginelli reaction have also been studied.
authors.affiliation: Department of Chemistry, National Central University, Jhongli, Taiwan 320, ROC.
authors.forename: Chih-Min
authors.initials: CM
authors.lastname: Wang
authors.forename: Yi-Ying
authors.initials: YY
authors.lastname: Wu
authors.forename: Chia-Hung
authors.initials: CH
authors.lastname: Hou
authors.forename: Chii-Chang
authors.initials: CC
authors.lastname: Chen
authors.forename: Kwang-Hwa
authors.initials: KH
authors.lastname: Lii