title: Structure property relationships affecting the proton conductivity in imidazole loaded Al-MOFs.
abstract: The structures of the imidazole loaded derivatives of Al-MIL-53 [Al(OH)(1,4-BDC-(CH3)x)] (x = 0, 1, 2) and CAU-11 ([Al(OH)(SDBA)]) (1,4-H2BDC = terephthalic acid; H2SDBA = 4,4'-sulfonyldibenzoic acid) were determined from powder X-ray diffraction data. Impedance spectroscopy measurements were carried out to evaluate their proton conductivities under anhydrous conditions at temperatures up to 110 °C. In Al-MIL-53-(CH3)x_HIm (x = 0, 1, 2) the formation of hydrogen bonds between the framework and the guest molecules results in a decrease in proton conductivity (x0= 1.7 × 10-6, x1= 1.9 × 10-8and x2= 1.7 × 10-9S cm-1at 110 °C and Eact= 0.42, 0.41 and 0.46 eV, for 0, 1 and 2 CH3-groups, respectively). The highest conductivity has been measured for CAU-11_HIm with 3.0 × 10-4S cm-1at 110 °C (Eact= 0.19 eV), where no host-guest hydrogen bonding interactions are observed.
authors.affiliation: Institut für Anorganische Chemie Christian-Albrechts-Universität zu Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany. stock@ac.uni-kiel.de.
authors.forename: T
authors.initials: T
authors.lastname: Homburg
authors.affiliation: Institut für Anorganische Chemie Christian-Albrechts-Universität zu Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany. stock@ac.uni-kiel.de.
authors.forename: C
authors.initials: C
authors.lastname: Hartwig
authors.affiliation: Institut für Anorganische Chemie Christian-Albrechts-Universität zu Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany. stock@ac.uni-kiel.de.
authors.forename: H
authors.initials: H
authors.lastname: Reinsch
authors.affiliation: Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Wark
authors.affiliation: Institut für Anorganische Chemie Christian-Albrechts-Universität zu Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany. stock@ac.uni-kiel.de.
authors.forename: N
authors.initials: N
authors.lastname: Stock