Abstract
A metal-organic framework (MOF) built from a combination of metal cations, neutral azole ligands and sulphate anions, [Cu2(DHBDI)3(SO4)2]n (1, DHBDI = 1H,5H-benzo[1,2-d:4,5-d']diimidazole), was synthesized. MOF 1 exhibits good chemical stability in acids, bases and boiling water while showing high hydrophilicity. Meanwhile, MOF 1 exhibits a proton conductivity of 1.14 × 10-3 S cm-1 at 90 °C and 98% RH, among the best for MOF materials with uncoordinated N sites. Temperature-dependent conductivity measurements suggest a vehicle mechanism (Ea = 0.64 eV) for proton transport.
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