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Issue 39, 2016
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Proton conduction via lattice water molecules in oxalato-bridged lanthanide porous coordination polymers

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Abstract

The proton conducting properties of two different structural types of porous coordination polymers [La2(ox)3(H2O)6]·4H2O (1) and [Er2(ox)3(H2O)6]·12H2O (2), where ox2− = oxalate, were investigated. 1 has a two-dimensional layered structure, whereas 2 has a three-dimensional structure. Both 1 and 2 have hydrophilic one-dimensional channels filled by lattice water molecules with hydrogen-bonding networks. The coordinated H2O molecules are Lewis acidic due to the lanthanoid ions donating protons to lattice-filling H2O molecules, thereby forming efficient proton conduction pathways. Alternating-current impedance analyses of 1 and 2 indicated significant proton conduction (σ = 3.35 × 10−7 S cm−1 at 368 K for 1, 1.79 × 10−6 S cm−1 at 363 K for 2 under RH = 100%, with Ea = 0.35 eV for 1 and 0.47 eV for 2), which was attributed to the Grotthuss mechanism via the lattice H2O molecules.

Graphical abstract: Proton conduction via lattice water molecules in oxalato-bridged lanthanide porous coordination polymers

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Publication details

The article was received on 07 Jul 2016, accepted on 19 Aug 2016 and first published on 19 Aug 2016


Article type: Paper
DOI: 10.1039/C6DT02677J
Citation: Dalton Trans., 2016,45, 15399-15405

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    Proton conduction via lattice water molecules in oxalato-bridged lanthanide porous coordination polymers

    R. Ishikawa, S. Ueno, S. Yagishita, H. Kumagai, B. K. Breedlove and S. Kawata, Dalton Trans., 2016, 45, 15399
    DOI: 10.1039/C6DT02677J

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