PHYS 152 |
| The design, synthesis, and properties of microporous framework materials have been the subject of intense recent interest, for example in areas such as gas storage and molecular separations. In particular, there have been major advances in the preparation of crystalline metal organic and covalent organic frameworks. We have synthesized organic conjugated poly(aryleneethynylene) polymers using Sonogashira-Hagihara coupling chemistry. These polymers are nanoporous (pore size <2 nm) and exhibit specific surface areas of up to 834 m2/g (Jiang et al., Angew. Chem., Int. Ed., 2007, in press, DOI: 10.1002/anie.200701595). Unlike metal organic and covalent organic frameworks, these conjugated nanoporous polymers are formed under kinetic control and are thus amorphous and show no long-range molecular order. Despite this, we show that it is possible to tune the micropore size distribution and surface area by varying the length of the rigid organic linkers, as demonstrated for ordered crystalline materials. This suggests for the first time that order is not a prerequisite for fine control over the nanoporous properties of organic networks. These polyyne networks are both thermally robust and chemically stable with respect to many MOFs because they are composed solely of strong carbon-carbon and carbon-hydrogen bonds. |
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Nanostructured Materials
1:20 PM-5:00 PM, Monday, April 7, 2008 Morial Convention Center -- Rm. 338/339, Oral
Division of Physical Chemistry |