Water stable oxalate-based coordination polymers with in situ generated cyclic dipeptides showing high proton conductivity

Abstract

Presented here are two water stable oxalate-based coordination polymers with in situ generated cyclic dipeptides, namely, (C₁₂H₁₆N₆O₂)[Zn₂(C₂O₄)₃] (SCU-63) and Mn(C₂O₄)(C₁₂H₁₄N₆O₂) (SCU-66). SCU-63 has a honeycomb-like layer intercalated with protonated cyclic dipeptide cations. SCU-66 has a diamondoid framework containing cyclic dipeptide ligands. The two compounds show high proton conductivity on the order of 10^-3 S cm^-1 at 85 °C under 98% relative humidity.