title: Synthesis and characterization of three ytterbium coordination polymers featuring various cationic species and a luminescence study of a terbium analogue with open channels.
abstract: Four novel metal-organic frameworks with 4,4'-oxybis(benzoate) (OBA) ligands and suitable cationic species, [NH(3)(CH(2))(2)NH(3)](0.5)[Yb(OBA)(2)(H(2)O)] (1), (NH(4))[Yb(OBA)(2)(H(2)O)(2)] (2), Na[Yb(OBA)(2)] x 0.4 DMF x 1.5 H(2)O (3), and Na[Tb(OBA)(2)] x 0.4 DMF x 1.5 H(2)O (4), have been synthesized and structurally characterized. The two-dimensional structure of 1 possesses open channels filled with ethylenediamine cations. The two-dimensional structure of 2 contains the network featuring organic ligands with uncoordinated functional RCO(2) groups suspended within the windows. The three-dimensional structure of 3, in which Na(+) cations replaced the NH(4)(+) cations of 2 and the presence of DMF molecules, adopts an open framework with large rhombic channels. The evacuated phase "Na[Yb(OBA)(2)]" in 3 retained rigidity and crystallinity to a high temperature. Framework 4, a terbium analogue of 3, has the potential sensing ability; it exhibited gradually increasing luminescence intensities when dispersed sequentially in water, methanol, and ethanol as suspensions.
authors.affiliation: Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: You-Wen
authors.initials: YW
authors.lastname: Lin
authors.forename: Bo-Ren
authors.initials: BR
authors.lastname: Jian
authors.forename: Sin-Chiang
authors.initials: SC
authors.lastname: Huang
authors.forename: Chin-Her
authors.initials: CH
authors.lastname: Huang
authors.forename: Kuei-Fang
authors.initials: KF
authors.lastname: Hsu