Study of
Proton Conductivity of a 2D Flexible MOF
and a 1D Coordination Polymer at Higher Temperature
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Abstract
We
report the proton conduction properties of a 2D flexible MOF and a
1D coordination polymer having the molecular formulas {[Zn(C<sub>10</sub>H<sub>2</sub>O<sub>8</sub>)<sub>0.5</sub>(C<sub>10</sub>S<sub>2</sub>N<sub>2</sub>H<sub>8</sub>)]·5H<sub>2</sub>O]}<sub><i>n</i></sub> (<b>1</b>) and {[Zn(C<sub>10</sub>H<sub>2</sub>O<sub>8</sub>)<sub>0.5</sub>(C<sub>10</sub>S<sub>2</sub>N<sub>2</sub>H<sub>8</sub>)]·2H<sub>2</sub>O]}<sub><i>n</i></sub> (<b>2</b>), respectively. Compounds <b>1</b> and <b>2</b> show high conductivity values of 2.55 × 10<sup>–7</sup> and 4.39 × 10<sup>–4</sup> S cm<sup>–1</sup> at
80 °C and 95% RH. The conductivity value of compound <b>1</b> is in the range of those for previously reported flexible MOFs,
and compound <b>2</b> 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
