ORGN 294 |
| J. Shailaja and Douglas L. Gin. Chemistry and Biochemistry, University of Colorado, Boulder, 215 UCB, Cristol building, Boulder, CO 80309 |
| Lyotropic liquid crystalline (LLC) based nanoporous materials with catalytic properties can potentially be used to degrade organic impurities in water. Many organic contaminants in gray water are small unsaturated or aromatic molecules. Catalytic oxidation (oxygenation) of these unsaturated organics under mild conditions into more hydrophilic and/or lower molecular weight entities would make them more easily biodegraded. Cross-linked LLCs are organic materials that are similar to zeolites which have ordered three-dimensional microporous structures and have been used as host matrices for photosensitization based catalytic oxidation. However, LLC networks have better structural and chemical tunability, mechanical properties and processability. A cationic organic photosensitizer dye methylene blue (MB) has been ion-exchanged into the anionic framework of a cross-linked inverted hexagonal LLC assembly. Upon visible light irradiation in presence of oxygen, MB generates singlet oxygen in the cavities of the LLC matrix which oxidizes hydrocarbons. 2-Methyl-2-heptene, a hydrocarbon has been oxidized in water using the MB/LLC complex. Oxidation has been achieved in water under ambient temperature in air and with the use of a commercially available inexpensive flood light. Studies with other sensitizers which either involve singlet oxygen or superoxide mechanism are underway. Oxidation of other aromatic and non-aromatic substrates are also being explored in water with these LLC materials. The poster will present the detailed work in this area. |
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Physical Organic, Combinatorial, Materials, Molecular Recognition
8:00 PM-10:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Organic Chemistry |
