Proton Conduction at High Temperature in High-Symmetry Hydrogen-Bonded Molecular Crystals of Ru^III Complexes with Six Imidazole-Imidazolate Ligands.

ABSTRACT: A new H-bonded crystal [Ru^III (Him)₃ (Im)₃ ] with three imidazole (Him) and three imidazolate (Im^- ) groups was prepared to obtain a higher-temperature proton conductor than a Nafion membrane with water driving. The crystal is constructed by complementary N-H⋅⋅⋅N H-bonds between the Ru^III complexes and has a rare Icy-c* cubic network topology with a twofold interpenetration without crystal anisotropy. The crystals show a proton conductivity of 3.08×10^-5  S cm^-1 at 450 K and a faster conductivity than those formed by only HIms. The high proton conductivity is attributed to not only molecular rotations and hopping motions of HIm frameworks that are activated at ∼113 K, but also isotropic whole-molecule rotation of [

SUBMITTER: Tadokoro M 

PROVIDER: S-EPMC9545294 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature