Pyrene and N,N-dimethylaniline as an electron donor-acceptor pair in bridged π-stacked tertiary ureas: Dynamics and mechanism

ORGN 107

Tarek A. Zeidan, t-zeidan@northwestern.edu1, Qiang Wang2, Milen Raytschev2, Torsten Fiebig2, and Frederick D. Lewis, fdl@northwestern.edu1. (1) Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, (2) Department of Chemistry, Boston College, Chestnut Hill, MA 02467
Aromatic systems assembled with tertiary urea linkers form strain-free folded conformations. We have previously reported that N,N'-diaryl-N,N'-dimethyl-ureas can form intramolecular excimers, exciplexes, or ion pairs, depending upon the choice of aromatic components. Here, we will present the use of femtosecond broadband pump-probe spectroscopy to study the dynamics of charge separation and charge recombination in a series of polyarylureas having pyrene and N,N-diemthylaniline end groups, separated by bridging phenylenediamines. The dynamics of charge transport across the bridge reveal a significant dependence on the donor-acceptor distance.

 

Process R&D, Physical Organic Chemistry, Heterocycles, Aromatics, Metal-Mediated Reactions
8:00 PM-10:00 PM, Sunday, March 25, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Division of Organic Chemistry

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007