ArticleChemical science2025
Isotropic proton conduction in an anisotropic crystal: the role of molecular rotational dynamics in imidazolium dihydrogen phosphate.
Article in Chemical science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Proton Tautomerism for Anhydrous Superprotonic Conduction in 1,2,3-Triazolium Dihydrogen Phosphate Crystal.Angewandte Chemie (International ed. in English) · 2026Article
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3 authors.
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Abstract
Understanding the intrinsic anhydrous proton conductivity and conduction mechanisms of solid electrolytes is of fundamental academic importance for their application in next-generation, non-humidified fuel cells. In this study, we investigated the anhydrous proton conductivity of single crystals of imidazolium dihydrogen phosphate (1), a material in which rotational motion of both the acid and base components is expected to contribute to the conduction mechanism. By controlling the crystallization conditions, we successfully and selectively prepared two polymorphs: a thermodynamically stable, non-centrosymmetric orthorhombic form (1A) and a metastable, centrosymmetric monoclinic form (1B). Single-crystal X-ray diffraction analysis of the stable phase 1A revealed an anisotropic crystal structure with one-dimensional hydrogen-bonding phosphate chains connected with N-H⋯O hydrogen bonds with imidazolium. Nevertheless, the intrinsic anhydrous proton conductivity, evaluated using single crystals, exhibited nearly isotropic behavior with minimal directional dependence. Solid-state
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