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Homburg, Thomas ; Tschense, Carsten ; Wolkersdoerfer, Konrad ; Reinsch, Helge ; Wark, Michael ; Többens, Daniel M. ; 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.
Bd. 644
(2018)
Heft 2
.
- S. 86-91.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201700371
Abstract
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).
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Metal phosphonate; Proton conductivity; Structure elucidation; Gallium; NMR crystallography; Proton dynamic |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III > Lehrstuhl Anorganische Chemie III - Univ.-Prof. Dr. Jürgen Senker Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie III |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 28 Jun 2018 09:49 |
| Letzte Änderung: | 06 Apr 2023 09:21 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/44745 |