Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 48, Pages 15519-15522Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08377
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Funding
- Army Research Office through a Multidisciplinary University Research Initiatives (MURI) [WG11NF-15-1-0047]
- Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001015]
- NSF
- Berkeley Center for Green Chemistry [1144885]
- ARAMCO, Saudi Arabia
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The imine linkages of two layered, porous covalent organic frameworks (COFs), TPB-TP-COF ([C6H3(C6H4N)(3)](2)[C6H4( CH)(2)](3), 1) and 4PE-1P-COF ([C-2(C6H4N)(4)][C6H4(CH)(2)](2), 2), have been transformed into amide linkages to make the respective isostructural amide COFs 1' and 2' by direct oxidation with retention of crystallinity and permanent porosity. Remarkably, the oxidation of both imine COFs is complete, as assessed by FT-IR and C-13 CP-MAS NMR spectroscopy and demonstrates (a) the first chemical conversion of a COF linkage and (b) how the usual crystallization problem encountered in COF chemistry can be bypassed to access COFs, such as these amides, that are typically thought to be difficult to obtain by the usual de novo methods. The amide COFs show improved chemical stability relative to their imine progenitors.
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