Proton conduction via lattice water molecules in oxalato-bridged lanthanide porous coordination polymers
| Autor: | Sadahiro Yagishita, Brian K. Breedlove, Shunya Ueno, Ryuta Ishikawa, Satoshi Kawata, Hitoshi Kumagai |
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| Rok vydání: | 2016 |
| Předmět: |
Lanthanide
Proton Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences Oxalate 0104 chemical sciences Ion Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Lattice (order) Molecule Grotthuss mechanism 0210 nano-technology |
| Zdroj: | Dalton Transactions. 45:15399-15405 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/c6dt02677j |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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