Front Cover: Proton Conduction at High Temperature in High‐Symmetry Hydrogen‐Bonded Molecular Crystals of Ru^III Complexes with Six Imidazole‐Imidazolate Ligands (Chem. Eur. J. 47/2022)

Abstract

The crystals of [RuIII(HIm)3(Im)3](1) are one of the rapid proton‐transport materials to work as proton conductors at high temperatures. The proton flow is caused by the strong rotations of Im⋅⋅⋅H−Im H‐bonding imidazole groups from 200 K. In the upper left image, as the temperature increases to 400 K, six coordinated imidazole groups are strongly rotating to transport protons. In the lower right image, whole‐molecule rotations start becoming the main rotation above 400 K. More information can be found in the Research Article by M. Tadokoro et al. (DOI: 10.1002/chem.202201397).