Organic Hybrid Antimoniotungstate Layered Ionic Crystal: Synthesis, Structure, and Interlayer-Confined Proton Conduction.

A synchronous crystal- and microstructure-dependent strategy was implemented to synthesize the organic hybrid antimoniotungstate layered ionic crystal Na 5.5 H 6.5 [(SbW 9 O 33 ) 2 {WO 2 (OH)} 2 {WO 2 }RuC 7 H 3 NO 4 ]·36H 2 O, and the layered structure was constructed through the Na + bridged sheet and the hydrogen-bonded layers. It displayed an effective proton conductivity of 2.97 × 10 -2 S cm -1 at 348 K and 75% RH, owing to the complete interlayer confined hydrogen-bond network formed by the hydrogens of interlayer crystal waters, organic ligands ({RuC 7 H 3 NO 4 } 2+ , {C 7 H 3 NO 4 } is formed by the hydrolysis of pyridine 2,5-dicarboxylic acid (C 7 H 5 NO 4 )), and acidic protons (H + ), along with the interlayer domain as a transport channel. Furthermore, the hydrogen-bond network originating from interlayer organic ligands and acidic protons was more stable at a higher temperature of 423 K, preserving a high conductivity of 1.99 × 10 -2 S cm -1 .