Various combinations of phosphonated molecules and metal ions are used to build up stable frameworks and are investigated in proton conductivity experiments.Depending on the ratio of both compounds still free phosphonic acid groups remain in the material which results in high proton conductivity. This can be further improved and values in the range of Nafion obtained by filling the framework with intrinsic proton-conducting small molecules. These MOF structures are elucidated by several analytical methods such as x-ray, solid-state NMR, TEM and SEM. Figure 1:  Plots of proton conductivity vs. temperature under 1 bar H2O atmosphere for hexakis(p-phosphonatophenyl)benzene-based metal phosphonates (?) and Nafion� 117 (?).

Proton-conducting phosphonated frameworks

246th National Meeting (2013)

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