Study of Proton Conductivity of a 2D Flexible MOF and a 1D Coordination Polymer at Higher Temperature

We
report the proton conduction properties of a 2D flexible MOF and a
1D coordination polymer having the molecular formulas {[Zn­(C10H2O8)0.5(C10S2N2H8)]·5H2O]}n (1) and {[Zn­(C10H2O8)0.5(C10S2N2H8)]·2H2O]}n (2), respectively. Compounds 1 and 2 show high conductivity values of 2.55 × 10–7 and 4.39 × 10–4 S cm–1 at
80 °C and 95% RH. The conductivity value of compound 1 is in the range of those for previously reported flexible MOFs,
and compound 2 shows the highest proton conductivity
among the carboxylate-based 1D CPs. The dimensionality and the internal
hydrogen bonding connectivity play a vital role in the resultant conductivity.
Variable-temperature experiments of both compounds at high humidity
reveal that the conductivity values increase with increasing temperature,
whereas the variable humidity studies signify the influence of relative
humidity on high-temperature proton conductivity. The time-dependent
measurements for both compounds demonstrate their ability to retain
conductivity up to 10 h.