A solvent- and pH-stable NiII-based metal-organic framework with benzothiadiazole derivative for proton conduction.

• A 1D MOF based on benzothiadiazole derivative has been solvothermally synthesized and fully characterized. • JXUST-26 exhibits good solvents and pH stabilities as well as relatively good thermal stability. • The proton conductivity reaches 3.24 × 10–7 S·cm-1 at 80 °C under 98% relative humidity. A one-dimensional metal–organic framework (MOF) with the formula of {[N i (BIBT)(pydc)(H 2 O) 2 ]·H 2 O} n (JXUST-26 , BIBT = 4,7-bis(1 H -imidazole-1-yl)-2,1,3-benzothiadiazole, H 2 pydc = 3,5-pyridinedicarboxylic acid) has been successfully synthesized under solvothermal condition, which crystallizes in the monoclinic C 2 /c space group. It is noteworthy that JXUST-26 exhibits good solvents and pH stabilities as well as relatively good thermal stability. The proton conductivity increases with increasing temperature, and reaches 1.65 × 10−8 S·cm−1 at 30 °C and 3.24 × 10−7 S·cm−1 at 80 °C under 98% relative humidity, respectively. In the low temperature range of 303–353 K, the activating energy (E a) is 0.51 eV, which belongs to the Vehicle mechanism. A NiII-based metal-organic framework based on benzothiadiazole derivative has been solvothermally synthesized, which exhibits good solvent, pH and thermal stability as well as significant proton conductivity (3.24 × 10–7 S·cm-1 at 80 °C and 98% RH). [Display omitted] [ABSTRACT FROM AUTHOR]