CHED 819 |
| Yousuf O. Ali and Heather Grunkemeyer. Department of Chemistry, Ohio Wesleyan University, 61 S. Sandusky St., Delaware, OH 43015 |
| Designing optical sensors for the detection of metals and organic analytes has become increasingly important. The basis of optical sensor design is to develop a supramolecule that acts as a fluorescent receptor for the analyte of interest. We have investigated the synthesis of a supramolecule designed such that the fluorescent properties of the system change upon the inclusion of lead. We studied 1,5,9,13 - Tetrathiacyclohexane - 3,11 - diol, a sulfur crown ether analog, for its potential to bind lead using NMR spectroscopy. Shifts in the NMR spectra indicate the formation of a lead-sulfur-diol complex. Since the sulfur analog is spectroscopically inert, we have attached a fluorophore, a dansyl group, whose fluorescent properties are extremely sensitive to environment. We studied the effects of solvent polarity on the fluorescence emission and fluorescence quantum yield of dansyl chloride and the dansyl modified crown ether. Our work showed that even small changes in the environment have significant effects on dansyl chloride’s fluorescent properties. We have also studied the effects of solvent polarity on the fluorescence emission and fluorescence quantum yield of the dansyl modified sulfur crown ether analog. We have found that even small environmental changes also alter the fluorescence properties of our dansyl modified 1,5,9,13 - Tetrathiacyclohexane - 3,11 - diol. |
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Undergraduate Research Poster Session: Organic Chemistry
2:00 PM-4:00 PM, Monday, March 29, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Chemical Education |