Molecular wire behavior in pi-stacked donor-bridge-acceptor tertiary arylureas

作者：Zeidan Tarek A; Wang Qiang; Fiebig Torsten^*; Lewis Frederick D

来源：Journal of the American Chemical Society, 2007, 129(32): 9848-+.

DOI：10.1021/ja073219n

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 pi-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 pi-stacked donor-bridge-acceptor system.

• 出版日期2007-8-15
• 单位西北大学