A novel coordination polymer of zinc(II) biphenyldicarboxylate bearing a sulfone group, [Zn(sbdc)(H2O)3]·(H2sbdc)· H 2O (H2sbdc: sulfone biphenyldicarboxylic acid), has been synthesized. It is composed of a one-dimensional chain structure of alternating Zn(II) cations and sbdc anions. This coordination polymer possesses noncoordinating uncharged acid H2sbdc existing between the chains with hydrogen-bonding networks. The proton conductivity of [Zn(sbdc)(H 2O)3]· (H2sbdc) · H2O strongly depended on the relative humidity (RH), being 2.5 x 10-7 S cm-1 at 95% RH. The activation energy for proton conductivity was estimated to be 0.32 eV at 95% RH.
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