Lyotropic liquid crystalline matrices as chiral receptors, molecular sensors and nano-filtration membranes

ORGN 172

J. Shailaja, Chemistry and Biochemistry, University of Colorado, Boulder, 215 UCB, Cristol building, Boulder, CO 80309 and Douglas L. Gin, Dept. of Chemistry & Biochemistry, and Dept. of Chemical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0424.
One of the frontiers in materials chemistry is the nano-scale architectural control of synthetic materials that is primarily responsible for the impressive properties of many biological structural materials and the unique reactivity of many organic and inorganic catalysts. Lyotropic liquid crystal functional materials have been designed with self-organizing nano-structures that form phases intermediate between crystalline solids and isotropic liquids. Through molecular design, it has been possible to incorporate functional properties into the LLC assemblies and subsequently polymerize them into robust polymer networks with preservation of their nano-structure. The nanoarchitecture, chemical composition, and processing of these LLC materials can be controlled and engineered for applications in nanofiltration membranes, molecular sensors and chiral receptors. The head groups of these amphiphilic molecules have been modified with carboxylic acid, amino sulfonic acid, amino thiol, amino acid and amino alcohol. The amide bonds in the molecular assembly provide strong hydrogen bonding interactions and hold the inverted hexagonal arrangement. These monomers could be cast on polymer supports and photo-cross-linked to give a stable material. Application in nano-filtration includes filtering small molecules like dyes, some biological molecules like protein and food material like wine and coffee. Some of the bulk samples can be used to absorb heavy metal cations from organic and aqueous solutions. Chirally modified LLC could be used for sensing and binding to other natural and non-natural chiral molecules and chiral resolution purposes. The poster will present a detailed description of the above stated work.

 

Asymmetric Reactions and Syntheses, Metal-Mediated Reactions, Materials, Molecular Recognition
8:00 PM-10:00 PM, Sunday, August 22, 2004 Pennsylvania Convention Center -- Hall D, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, August 23, 2004 Pennsylvania Convention Center -- Hall D, Sci-Mix

Division of Organic Chemistry

The 228th ACS National Meeting, in Philadelphia, PA, August 22-26, 2004