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SUMMARY:Colloquium To Benzazoles and Back:	 Cruciform Fluorophores and Dynamic Self-Sorting Libraries
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: Sensing of chemical species represents one of the broadest and most persistent challenges in Chemistry and related disciplines. Our ambition in this field is to create a generalized sensing strategy that would allow qualification and quantification of virtually any analyte using a family of structurally closely related sensors. We are attacking this problem from two directions. On one side, we are working on the synthesis, characterization, and sensing behavior of benzobisoxazole-based cruciform fluorophores.  These cruciforms have their frontier molecular orbitals localized on different portions of the molecule (analogous to the previous work of Bunz and others), which makes them well-suited to act as sensors: wherever the analyte binds, it induces a change in the HOMO–LUMO gap and the associated optical properties. Carboxylic and organoboronic acids, phenols, amines, ureas, and small inorganic anions can=0D=0A=
be sensed using this compound class. On the other front, we are creating and studying self-organizing mixtures of imines and other reversibly formed compounds. These dynamic libraries can respond to stimuli by amplifying the component with that best adapts to the stimulus. Our intention is to use this behavior to identify and amplify best sensors for given analytes under dynamic conditions—thus minimizing the synthetic effort invested in the optimization of sensor structures. This presentation will highlight our recent results in both of these areas.=0D=0A=
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For additional information contact Mrs. Barbara Rauls, 710-4926=0D=0A=
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LOCATION:BSB C105
DTSTART;TZID=US_Central:20121116T153000
DTEND;TZID=US_Central:20121116T163000
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