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Magnesium doped Gallium Phosphonates Ga₁-ₓMgₓ[H₃₊ₓ(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity

Title data

Homburg, Thomas ; Tschense, Carsten ; Wolkersdoerfer, Konrad ; Reinsch, Helge ; Wark, Michael ; Többens, Daniel ; Zander, Stefan ; Senker, Jürgen ; Stock, Norbert:
Magnesium doped Gallium Phosphonates Ga₁-ₓMgₓ[H₃₊ₓ(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity.
In: Zeitschrift für anorganische und allgemeine Chemie. Vol. 644 (1 February 2018) Issue 2 . - pp. 86-91.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201700371

Abstract in another language

In our contribution to the development of new proton conductive coordination polymers (CPs) we focus on the impact of a partial replacement of Ga3+ by Mg2+. This approach should come along with the introduction of additional protons due to charge balances. In a first step we have synthesized an isostructural compound to the literature known compound AlH3P3N [H6P3N = nitrilotris(methylene)triphosphonic acid], where Al3+ is replaced by Ga3+, since all attempts to incorporate Mg2+ ions directly into AlH3P3N were not successful. The relative amount of Mg2+ and Ga3+ was established by EDX analysis. Rietveld refinement of the synchrotron data located the Ga3+ and Mg2+ ions on a split position, proving the disordered incorporation of the Mg2+ ions. Solid‐state NMR spectroscopy confirms a disordered protonation of the phosphonate groups as well and shows that all amine groups are protonated. In order to investigate the effect on the proton conductivity the compounds Ga[H3(O3PCH2)3N], denoted GaH3P3N as well as Ga0.80Mg0.20[H3.20(O3PCH2)3N], denoted GaMgH3.20P3N, were characterized by electrochemical impedance spectroscopy (EIS). Arrhenius behavior in the investigated temperature range (70–130 °C) was found for both compounds (activation energies of Ea = 0.15 eV for GaH3P3N and 0.17 eV for GaMgH3.20P3N). The GaMgH3.20P3N sample shows a reduced proton mobility (σ = 1.2 × 10–4 S·cm–1) of about one order of magnitude in comparison to GaH3P3N (σ = 1.0 × 10–3 S·cm–1).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Metal phosphonate; Proton conductivity; Structure elucidation; Gallium; NMR crystallography; Proton dynamic
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry III > Chair Anorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 28 Jun 2018 09:49
Last Modified: 26 Sep 2019 06:26
URI: https://eref.uni-bayreuth.de/id/eprint/44745