Engineering the proton conductivity of metal–organic hybrid materials by varying the coordination mode of the ligand†
Abstract
Reports of the design and synthesis of adjustable proton-conducting metal–organic coordination hybrids are still rare. Herein, we synthesized and characterized two coordination compounds: Cu(HL)L (1) and H4Mo8O24L4·3H2O (2) (L = 4-(1H-imidazolyl) benzoic acid). In addition, we first report the adjustment of the proton conductivity of metal–organic hybrids via varying the coordination mode of a specific ligand L (L = 4-(1H-imidazolyl) benzoic acid). Compound 1 has a proton conduction of 1.08 × 10−3 S cm−1 at 97% RH at room temperature, whereas under the same conditions, 2 has an obviously lower proton conduction of 1.09 × 10−6 S cm−1. The proton conduction of the two hybrids varied by nearly one thousand fold.
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