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Updated: Jul 18, 2026
Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
Published on: September 5, 2018
Carboxylate-Directed Self-Assembly of [Mo2O4]2+ Units for Enhanced Proton Conduction
Qianqian Liu1, Jiajia Li2, Shilei Liu1
1Key Laboratory of Polyoxometalate and Reticular Chemistry of Ministry of Education Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
Abstract:
Three new polyoxomolybdate-based complexes functionalized with organic carboxylic acid ligands were synthesized and structurally characterized: Na2[CN3H6]4[(MoV2O4)2(MoVIO4)2(HC3O5)2(H2O)3]·2H2O (complex 1); [CN3H6]6[(MoV2O4)2(MoVIO4)2(HC3O5)2] (complex 2); and [CN3H6]4[(MoV2O4)2(H2C4O6)2]·2H2O (complex 3). Complexes 1-3 were obtained via condensation reactions between the organic carboxylic acid ligands and the [Mo2O4(H2O)6]2+ precursor. Each complex features [Mo2O4(H2O)6]2+ cores, organic carboxylate moieties, and protonated guanidiniums ([CN3H6]+) as structural components. Notably, complexes 1-3 exhibit extensive hydrogen-bonding networks, contributing to their remarkable proton conductivity. Under the conditions of 50 °C and 90% relative humidity, complexes 1-3 demonstrated proton conductivities of 3.52 × 10-2, 9.78 × 10-4, and 1.87 × 10-2 S cm-1, respectively. Furthermore, molecular electrostatic potential (MEP) analysis revealed the surface charge distribution of the polyoxometalate (POM) anion clusters. Combined with single-crystal X-ray diffraction studies, these analyses elucidated potential proton transfer sites and the conduction pathway.
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