Ultrafast photophysics of conjugated polyelectrolytes

PHYS 342

Gustavo M Moriena, gustavom@chem.ufl.edu1, Sevnur Komurlu, sevnur@ufl.edu1, Xiaoyong Zhao, xyzhao@chem.ufl.edu1, Seoung Ho Lee1, Hui Jiang, huijiang@chem.ufl.edu2, Kirk S. Schanze, kschanze@chem.ufl.edu2, and Valeria D. Kleiman, kleiman@chem.ufl.edu3. (1) Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611, (2) Department of Chemistry and Center for Macromolecular Science and Engineering, University of Florida, PO Box 117200, Gainesville, FL 32611, (3) Department of Chemistry, Center for Chemical Physics, University of Florida, PO BOX 117200, Gainesville, FL 32611-7200
In this work we investigate time resolved photophysics of energy transfer in conjugated linear polyelectrolytes with hyperbranched side chains. In recent years, π-conjugated polyelectrolytes (CPEs) have been synthesized incorporating ionic solubilizing side groups thus enabling the CPE to be dissolved in water and other polar solvents. Due to their extended π-conjugation, CPEs show interesting optical and electronic properties, making them promising as active material for solar cells and chemical and biological sensors. We present here our latest results in the investigation of a “homologous series” of variable HOMO-LUMO band gap poly(arylene ethynylene)s with dendritic ionic terminal groups. Absorption and emission wavelengths are modulated by the nature of the arylene group, while side chains provide polyelectrolytes with negative or positive charges. Using fs/ps time-resolved absorption and emission techniques we explore exciton dynamics in these CPEs. In particular, we focus on intrachain energy transfer and transfer between isolated and aggregated CPEs chains.

 

PHYS Poster Session - Optical Probes of Dynamics in Complex Environments
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Sci-Mix

Division of Physical Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008