Magnesium doped Gallium Phosphonates Ga_1–xMg_x[H_3+x(O₃PCH₂)₃N] (x = 0, 0.20) and the Influence on Proton Conductivity

Abstract

In our contribution to the development of new proton conductive coordination polymers (CPs) we focus on the impact of a partial replacement of Ga 3+ by Mg 2+ . 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 AlH 3 P3N [H 6 P3N = nitrilotris(methylene)triphosphonic acid], where Al 3+ is replaced by Ga 3+ , since all attempts to incorporate Mg 2+ ions directly into AlH 3 P3N were not successful. The relative amount of Mg 2+ and Ga 3+ was established by EDX analysis. Rietveld refinement of the synchrotron data located the Ga 3+ and Mg 2+ ions on a split position, proving the disordered incorporation of the Mg 2+ ions. Solid-state NMR spec-

Ligand-Functionalized MIL-68-type Indium(III) Metal–Organic Frameworks with Prominent Intrinsic Proton Conductivity

“…Our indium-based MOFs without any postprocessing have proton conductivity up to 10 –3 S/cm. As illustrated in Table , compared with previously reported MOFs, ,,− our study has certain advantages. The highest σ values of MIL-68-In-OH and MIL-68-In-NH 2 are at the forefront of the main-group metal-based MOFs that have been reported. ,,− The organic ligands we chose contain –NH 2 and OH, which are postmodifiable groups, and we believe that the postmodification proton conductivity of these MOFs will be even better, which proves that such MOFs have a broad utilization value in the field of fuel cells and electrochemistry and also provides us with the ideas for our future research.…”

Tailored Porous Ferrocene-Based Metal–Organic Frameworks as High-Performance Proton Conductors

“…They are much smaller than the proton conductivity of Al-MOF, MIL-53-FcDC-Al constructed by ferrocene dicarboxylate ligands reported in this paper under similar testing conditions, due to the scarcity of reports in the literature on the σ of similar MOFs built by carboxyl ligands, particularly Ga- and In-MOFs. As illustrated in Table , we compared the σ of the three MOFs in this paper with other MOFs with good performance and discovered that they were at the forefront. ,,− It is worth noting that the proton conductivity of the three MOFs can reach 10 –3 S/cm without any additional processing, which thoroughly reveals the performance advantage of ferrocenyl carboxylic acid–based MOFs.…”