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Supramolecular engineering of intrinsic and extrinsic porosity in covalent organic cages
- Source :
- Journal of the American Chemical Society. 133(41)
- Publication Year :
- 2011
-
Abstract
- Control over pore size, shape, and connectivity in synthetic porous materials is important in applications such as separation, storage, and catalysis. Crystalline organic cage molecules can exhibit permanent porosity, but there are few synthetic methods to control the crystal packing and hence the pore connectivity. Typically, porosity is either 'intrinsic' (within the molecules) or 'extrinsic' (between the molecules)--but not both. We report a supramolecular approach to the assembly of porous organic cages which involves bulky directing groups that frustrate the crystal packing. This generates, in a synthetically designed fashion, additional 'extrinsic' porosity between the intrinsically porous cage units. One of the molecular crystals exhibits an apparent Brunauer-Emmett-Teller surface area of 854 m(2) g(-1), which is higher than that of unfunctionalized cages of the same dimensions. Moreover, connectivity between pores, and hence guest uptakes, can be modulated by the introduction of halogen bonding motifs in the cage modules. This suggests a broader approach to the supramolecular engineering of porosity in molecular organic crystals.
- Subjects :
- Models, Molecular
Halogen bond
Chemistry
Macromolecular Substances
Surface Properties
Supramolecular chemistry
Nanotechnology
General Chemistry
Biochemistry
Catalysis
Crystal
Colloid and Surface Chemistry
Chemical engineering
Covalent bond
Molecule
Organic Chemicals
Particle Size
Porosity
Porous medium
Subjects
Details
- ISSN :
- 15205126
- Volume :
- 133
- Issue :
- 41
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....0d391c7662040c831c9c206e9dd4aeda