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Article Abstract
Three new polyoxomolybdate-based complexes functionalized with organic carboxylic acid ligands were synthesized and structurally characterized: Na[CNH][(MoO)(MoO)(HCO)(HO)]·2HO (complex ); [CNH][(MoO)(MoO)(HCO)] (complex ); and [CNH][(MoO)(HCO)]·2HO (complex ). Complexes - were obtained via condensation reactions between the organic carboxylic acid ligands and the [MoO(HO)] precursor. Each complex features [MoO(HO)] cores, organic carboxylate moieties, and protonated guanidiniums ([CNH]) as structural components. Notably, complexes - exhibit extensive hydrogen-bonding networks, contributing to their remarkable proton conductivity. Under the conditions of 50 °C and 90% relative humidity, complexes - demonstrated proton conductivities of 3.52 × 10, 9.78 × 10, and 1.87 × 10 S cm, 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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