ORGN 377 |
| Organic synthetic methodologies provide excellent control over the molecular composition of the elementary building blocks in organic materials. Properties such as electron affinity, ionization potential and emission frequencies are under control. A major challenge, however, concerns being able to program at the molecular level the collective behavior of organic optoelectronic materials. As independent molecules begin to coalesce to form the condensed state, weak interactions determine the final arrangement in the bulk. The final organization determines the degree of electronic coupling and important parameters for enabling new technologies, such as charge carrier conduction, exchange of excited states, emission efficiencies and photoinduced charge transfer. Even when one extracts well defined unimolecular "pairs" of chromophores, there is a substantial challenge to our theoretical interpretation of the electronic states. Several examples will be presented that highlight recent advances in understanding through-space interactions in chromophores with π-delocalized electronic structures and the application of organic semiconductors in optically amplified biosensors, efficient light emitting devices and some of the most efficient "plastic" solar cells. Particular emphasis will be placed on molecules built on the [2.2]paracyclophane framework and in conjugated polyelectrolytes, where the properties of organic semiconductors are coupled with the charge-mediated behavior of polyelectrolytes.
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Arthur C. Cope and Arthur C. Cope Scholars Awards
8:00 AM-12:05 PM, Tuesday, August 21, 2007 BCEC -- Ballroom, Oral
Division of Organic Chemistry |
