Browsing by Subject "adsorption properties"
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Item A Benzocrown-6-Calix 4 Arene Methacrylate Copolymer: Selective Extraction of Caesium Ions from a Multi-Component System(2010-09) Rambo, Brett M.; Kim, Sung Kuk; Kim, Jong Seung; Bielawski, Christopher W.; Sessler, Jonathan L.; Rambo, Brett M.; Kim, Sung Kuk; Bielawski, Christopher W.; Sessler, Jonathan L.The synthesis and extraction properties of a copolymer comprised of a 10: 1 molar ratio of methyl methacrylate (MMA) and a methacrylate functionalized benzocrown-6-calix[ 4] arene are reported. Under aqueous-dichloromethane liquid-liquid extraction conditions, the copolymer displayed an enhanced selectivity for caesium over sodium and potassium (in the form of their picrate salts) as compared to an appropriate small molecule analogue. Further, the copolymer was capable of removing caesium nitrate from aqueous solution in the presence of various other anionic (e. g., F(-), Cl(-), and SO(4)(-)) and cationic species (e. g., K(+) and Na(+)). The ability of this polymeric system to extract inorganic caesium salts into dichloromethane from aqueous media scaled with the relative hydration energies (D(hyd)G degrees) of each anion studied (i.e., NO(3)(-) > Br(-) >> Cl(-) or F(-)).Item Construction of 1-D 4F and 3D-4F Coordination Polymers with Flexible Schiff Base Ligands(2011-07) Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.; Wong, Wai-Kwok; Yang, Xiaoping; Lam, Daniel; Chan, Christopher; Stanley, Julie M.; Jones, Richard A.; Holliday, Bradley J.Three new lanthanide 1-D coordination polymers ({[Ln(2)(H2L)(OAc)(6)]center dot EtOH center dot 2H(2)O}(n) (Ln = Eu (1), Er (2)) and {YbNiLCl(OAc)(2)(H2O)}(n) (3)) and a heterobinuclear complex [YbNiLCl3(H2O)(3)] (4) are reported which are formed from salen type Schiff-base ligands H2L (H2L = N,N'-bis(3-methoxysalicylidene) butane-1,4-diamine). The polymeric structures are formed by bridging H2L units in the case of 1 and 2, and by acetate groups in 3. The structures of 1-4 were determined by single crystal X-ray crystallographic studies and their luminescence properties in MeCN solution were determined.