Abstract
The synthesis, structure, and electronic properties of a series of tertiary polyarylureas possessing pyrene and dimethylaniline capping groups separated by zero-to-four phenylenediamine bridging groups are described. These molecules adopt folded π-stacked structures. The dynamics of photoinduced charge separation and charge recombination are investigated by femtosecond broadband pump-probe spectroscopy. The structure lacking a bridging group displays ultrafast charge separation (within 2 ps) and charge recombination typical of stacked dyad systems. Structures having one-to-four bridging groups undergo charge separation with decay times of 8-21 ps and charge recombination with decay times of 60-120 ps that are only weakly dependent upon the distance between the pyrene and dimethylaniline capping groups. This behavior is similar to that of wire-like systems having extended conjugated bridges and provides the first example of wire-like behavior in a π-stacked donor-bridge-acceptor system.
Original language | English (US) |
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Pages (from-to) | 9848-9849 |
Number of pages | 2 |
Journal | Journal of the American Chemical Society |
Volume | 129 |
Issue number | 32 |
DOIs | |
State | Published - Aug 15 2007 |
ASJC Scopus subject areas
- General Chemistry
- Biochemistry
- Catalysis
- Colloid and Surface Chemistry