Two Anhydrous Salts of Tetrafluoroterephthalic Acid (H2tF-­BDC): K2tF-BDC and Rb2tF-BDC

Authors

  • Melanie Werker,

    1. Department für Chemie, Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
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  • Benedikt Dolfus,

    1. Department für Chemie, Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
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  • Uwe Ruschewitz

    Corresponding author
    1. Department für Chemie, Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
    • Department für Chemie, Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany, Fax: +49-221-470-3933

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  • Dedicated to Professor Bernt Krebs on the Occasion of His 75th Birthday

  • Supporting Information for this article is available on the WWW under http://dx.doi.org/10.1002/zaac.201300480 or from the author.

Abstract

Two new anhydrous salts of tetrafluoroterephthalic acid (H2tF-BDC), namely K2tF-BDC (1) and Rb2tF-BDC (2), were synthesized and structurally characterized. The crystal structure of 1 (I2/m, Z = 2) was solved and refined from X-ray single crystal data. K+ (CN = 8) is coordinated by six oxygen atoms of five different tF-BDC2– linkers and two fluorine atoms of two of these linkers, which connect the KO6F2 polyhedra to a 3D network. The crystal structure of 2 (Pequation image, Z = 1) was refined from X-ray powder diffraction data. It crystallizes in a structure type already known from Tl2tF-BDC. Rb+ (CN = 8) is also coordinated by six oxygen and two fluorine atoms. But six tF-BDC2– linkers are involved in the coordination. Again, a 3D network is formed. Both compounds can be obtained as single-phase samples. They are not porous and stable in air. The thermal stability was investigated by DTA/TG measurements. The decomposition starts at approx. 200 °C (1) and 230 °C (2). Their good solubility in water makes them interesting starting materials for the synthesis of new MOFs with the perfluorinated linker tF-BDC2–.

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