ORGN 6 |
| Ted Goodson III, Chemistry Department, Chemistry Department, Wayne State University, 5101 cass ave, room 63, detroit, MI 48202 |
| The use of organic branched macromolecules for light emitting, nonlinear optical, and quantum optical applications has attracted a wide degree of recent interest. Much of this enthusiasm stems from the possibility of strong coupling of many participating chromophores in the three dimensional aggregate system which may lead to significantly enhanced transition dipole moments. In this presentation the results of time-resolved measurements as well as nonlinear optical investigations will be provided for several selected organic branched macromolecular systems. The energy transfer process as measured by fluorescence upconversion measurements in organic dendritic structures with different building blocks will be discussed. Low temperature ultra-fast fluorescence and fluorescence anisotropy (4K) measurements of energy migration in novel branched systems will also be given in relation to discerning the mode of excitation energy transport. Details of a comparison of important building block structures for enhanced energy transfer properties will be given. The results of nonlinear transmission measurements are provided in relation to the discussion of enhancement in the branching macromolecular architecture. Transient absorption measurements also provide strong evidence of the very fast initial delocalization of the branching center in certain nitrogen centered systems that help to facilitate the strong coupling of the branching chromophores.
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Molecular Mimicry of Photosynthesis
8:30 AM-12:00 PM, Sunday, August 22, 2004 Pennsylvania Convention Center -- Ballroom B, Oral
Division of Organic Chemistry |