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Abstract
AbstractTwo proton‐conducting organic–inorganic hybrid complexes have been constructed by the self‐assembly of protonated water clusters, transition‐metal aqua ions, [PMo12O40]3– anions and isonicotinic acid N‐oxide (HINO). Single‐crystal X‐ray diffraction analyses at 293 K revealed that both complexes presented exactly the same three‐dimensional supramolecular framework built from non‐covalent interactions. Interestingly, the [PMo12O40]3– anions self‐assembled into poly‐Keggin‐anion chains in the supramolecular frameworks. Thermogravimetric analyses showed no weight loss for either system in the temperature range of 20–100 °C, which indicates that none of the water molecules in the unit structure are easily lost below 100 °C. Surprisingly, the proton conductivities of 1 and 2 in the temperature range of 85–100 °C under 98 % relative humidity reached good proton conductivities of 10–3 S cm–1. A possible mechanism for the proton conduction in accord with experimental results is proposed.
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