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Anion Exchange in Coordination-Network Materials

Authors

  • Pongthipun Phuengphai,

    1. Department of Fundamental Science, Faculty of Science and Technology, Surindra Rajabhat University, Surin 32000, Thailand
    2. Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
    3. Leiden Institute of Chemistry, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands
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  • Chiara Massera,

    1. Dipartimento di Chimica, Università degli Studi di Parma, Viale delle Scienze 17/A, 43124 Parma, Italy
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  • Jan Reedijk,

    1. Leiden Institute of Chemistry, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands
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  • Sujittra Youngme,

    1. Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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  • Patrick Gamez

    1. Departament de Química Inorgànica QBI, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain, http://www.bio-inorganic-chemistry-icrea-ub.com
    2. Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain
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Abstract

Six coordination polymers, namely, the three-dimensional frameworks {[Zn3(4,4′-bpy)3.5(μ-O2CH)4(H2O)2](ClO4)2(H2O)2}n (1, 4,4′-bpy = 4,4′-bipyridine) and {[Zn3(4,4′-bpy)3.5(μ-O2CH)4(H2O)2](PF6)2}n (2), the two-dimensional networks {[Zn(4,4′-bpy)(μ-O2CH)(H2O)2](CF3SO3)(H2O)}n (3) and {[Zn3(4,4′-bpy)4(μ-O2CCH2CH3)4](ClO4)2(4,4′-bpy)2(H2O)4}n (4), the one-dimensional double-stranded zigzag chain {[Zn3(4,4′-bpy)4(μ-O2CCH2CH3)4(H2O)2](PF6)2(H2O)2}n (5), and the one-dimensional double-ladder chain {[Zn2(4,4′-bpy)2(μ-O2CCH2CH3)2(H2O)2](CF3SO3)2}n (6), have been prepared. The solid-state structures of the six compounds all exhibit void spaces that contain anions and neutral guest molecules, namely, water for 1, 3 and 5, and water/4,4′-bpy for 4. The anion-exchange properties of the compounds have been investigated by monitoring the substitution of the ions by infrared spectroscopy. Furthermore, X-ray powder diffraction studies and elemental analyses have been used to further confirm the anion exchange. The results show that the anions in all compounds can be replaced with ClO4 or PF6 for 1, 2, 4, and 5, ClO4 and PF6 for 3, and ClO4, PF6, and BF4 for 6. Furthermore, compound 1 shows interesting reversible anion-exchange properties in aqueous solution.

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