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. 2016 Dec 7;138(48):15519-15522.
doi: 10.1021/jacs.6b08377. Epub 2016 Nov 29.

Chemical Conversion of Linkages in Covalent Organic Frameworks

Peter J Waller  1 , Steven J Lyle  1 , Thomas M Osborn Popp  1   2 , Christian S Diercks  1 , Jeffrey A Reimer  2 , Omar M Yaghi  1   3
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Free article

Chemical Conversion of Linkages in Covalent Organic Frameworks

Peter J Waller et al. J Am Chem Soc. .
Free article

Abstract

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 ([C2(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 13C 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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