ORGN 318 |
| Jeremy Collette, Department of Chemistry, University of Southern California, Loker Hydrocarbon Research Institute, MS1661, Los Angeles, CA 90025 and Aaron W. Harper, Department of Chemistry, Loker Hydrocarbon Institute, University of Southern California, 837 Bloom Walk, Los Angeles, CA 90089. |
| Advancement over the past decade of materials based on two-photon absorption has been phenomenal, yet, a need for greater understanding of multi-photon processes remains. Questions of design to maximize two-photon absorbance cross-sections and quantum yields have been addressed quantitatively; however, effects of the chemical environment on the absorption and emission processes in these chromophores are largely unexplored. This study presents the effects of solvent on the absorbance and fluorescence characteristics of a set of six two-photon engineered alkylamino substituted styryl pyrazine dyes. The solvatochromic comparison method is employed to derive structure-optical property relationships within this family of fluorophores, and the effects of solvent polarity, hydrogen-bonding, and inductive and dispersive forces are discussed. DFT frontier orbital calculations and conclusions drawn from the spectroscopic study of these chromophores suggests that cooperative and competitive intramolecular charge transfer coupling between the electron donating arms of the fluorophores affect both solvatochromic bandwidth and quantum yield. |
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Materials, Devices, and Switches
8:00 AM-11:20 AM, Tuesday, September 9, 2003 Sheraton New York -- Versailles Ballroom, Oral
Division of Organic Chemistry |