Highly Proton‐Conductive Zinc Metal‐Organic Framework Based On Nickel(II) Porphyrinylphosphonate

The design of new solid‐state proton‐conducting materials is a great challenge for chemistry and materials science. Herein, a new anionic porphyrinylphosphonate‐based MOF (IPCE‐1Ni), which involves dimethylammonium (DMA) cations for charge compensation, is reported. As a result of its unique structure, IPCE‐1Ni exhibits one of the highest value of the proton conductivity among reported proton‐conducting MOF materials based on porphyrins (1.55×10−3 S cm−1 at 75 °C and 80 % relative humidity). Easy and efficient! A new porphyrinylphosphonate‐based MOF (IPCE‐1Ni) was synthesized by an original synthetic approach. The crystal structure of the IPCE‐1Ni includes dimethylammonium cations localized in the pores, that determines the proton conductivity of 1.55×10−3 S cm−1 at 75 °C and 80 % RH.