Water and Protons in Porous Coordination Polymers

Osamu Yamamuro (Institute for Solid State Physics, University of Tokyo)

Porous coordination polymers (abbreviated to PCP) are remarked as a new system confining water and also as good proton conductors. The merit of PCP is that various pores can be designed by changing metals and legands. Protons are usually supplied by weak-acid group of legands and carried by water. So far, we have studied copper rubeanate (CuC2N2S2H2) [1,2], biimidazole complexes ([M(H2bim)3](TMA) (M = Co, Cr, ..., TMA = trimesic acid)) [3], zinc oxalate complex ((NH4)2[HOOC(CH2)4COOH][Zn2(C2O4)3]) [4], etc. We have measured the quasielastic neutron scattering of these materials to investigate the dynamics of water molecules and protons in the pores. The heat capacities and X-ray/neutron diffraction patterns of these materials were also measured to investigate their phase behaviors and structures. The general mechanism of the proton conduction in PCPs will be discussed.

References [1] T. Yamada, et al., J. Phys. Chem. B 114, 8405 (2010). [2] T. Yamada, et al., J. Phys. Chem. B 115, 13563 (2011). [3] M. Tadokoro, et al., J. Phys. Chem. B 114, 2091 (2010). [4] M. Sadakiyo et al., J. Am. Chem. Soc. 131, 9906 (2009).

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