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  • Title: One-dimensional imidazole aggregate in aluminium porous coordination polymers with high proton conductivity.
    Author: Bureekaew S, Horike S, Higuchi M, Mizuno M, Kawamura T, Tanaka D, Yanai N, Kitagawa S.
    Journal: Nat Mater; 2009 Oct; 8(10):831-6. PubMed ID: 19734885.
    Abstract:
    The development of anhydrous proton-conductive materials operating at temperatures above 80 degrees C is a challenge that needs to be met for practical applications. Herein, we propose the new idea of encapsulation of a proton-carrier molecule--imidazole in this work--in aluminium porous coordination polymers for the creation of a hybridized proton conductor under anhydrous conditions. Tuning of the host-guest interaction can generate a good proton-conducting path at temperatures above 100 degrees C. The dynamics of the adsorbed imidazole strongly affect the conductivity determined by (2)H solid-state NMR. Isotope measurements of conductivity using imidazole-d4 showed that the proton-hopping mechanism was dominant for the conducting path. This work suggests that the combination of guest molecules and a variety of microporous frameworks would afford highly mobile proton carriers in solids and gives an idea for designing a new type of proton conductor, particularly for high-temperature and anhydrous conditions.
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