期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 47, 页码 14614-14617出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201607745
关键词
gas capture; metal-organic frameworks; phosphonate monoester; phosphonates; porous solids
资金
- Carbon Management Canada
- Natural Sciences and Engineering Research Council (NSERC) of Canada
A crystalline and permanently porous copper phosphonate monoester framework has been synthesized from a tetraaryl trigonal phosphonate monoester linker. This material has a surface area over 1000 m(2) g(-1), as measured by N-2 sorption, the highest reported for a phosphonate-based metalorganic framework (MOF). The monoesters result in hydrophobic pore surfaces that give a low heat of adsorption for CO2 and low calculated selectivity for CO2 over N-2 and CH4 in binary mixtures. By careful manipulation of synthetic conditions, it is possible to selectively remove some of the monoesters lining the pore to form a hydrogen phosphonate while giving an isomorphous structure. This increases the affinity of the framework for CO2 giving higher ambient uptake, higher heat of adsorption, and much higher calculated selectivity for CO2 over both N-2 and CH4. Formation of the acid groups is noteworthy as complexation with the parent acid gives a different structure.
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