Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 5, Pages 1737-1741Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201509014
Keywords
covalent organic frameworks; gas adsorption; ionic polymers; lithium-ion conductivity; spiroborates
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Funding
- National Science Foundation [DMR-1055705]
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A novel type of ionic covalent organic framework (ICOF), which contains sp(3) hybridized boron anionic centers and tunable countercations, was constructed by formation of spiroborate linkages. These ICOFs exhibit high BET surface areas up to 1259 m(2) g(-1) and adsorb a significant amount of H-2 (up to 3.11 wt%, 77 K, 1 bar) and CH4 (up to 4.62 wt%, 273 K, 1 bar). Importantly, the materials show good thermal stabilities and excellent resistance to hydrolysis, remaining nearly intact when immersed in water or basic solution for two days. The presence of permanently immobilized ion centers in ICOFs enables the transportation of lithium ions with room-temperature lithium-ion conductivity of 3.05 x 10(-5) S cm(-1) and an average Li+ transference number value of 0.80 +/- 0.02. Our approach thus provides a convenient route to highly stable COFs with ionic linkages, which can potentially serve as absorbents for alternative energy sources such as H-2, CH4, and also as solid lithium electrolytes/separators for the next-generation lithium batteries.
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