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High Proton Conduction in a Chiral Ferromagnetic Metal–Organic Quartz-like Framework

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journal contribution
posted on 05.10.2011 by Emilio Pardo, Cyrille Train, Geoffrey Gontard, Kamal Boubekeur, Oscar Fabelo, Hongbo Liu, Brahim Dkhil, Francesc Lloret, Kosuke Nakagawa, Hiroko Tokoro, Shin-ichi Ohkoshi, Michel Verdaguer
A complex-as-ligand strategy to get a multifunctional molecular material led to a metal–organic framework with the formula (NH4)4[MnCr2(ox)6]·4H2O. Single-crystal X-ray diffraction revealed that the anionic bimetallic coordination network adopts a chiral three-dimensional quartz-like architecture. It hosts ammonium cations and water molecules in functionalized channels. In addition to ferromagnetic ordering below TC = 3.0 K related to the host network, the material exhibits a very high proton conductivity of 1.1 × 10–3 S cm–1 at room temperature due to the guest molecules.