Photoinduced charge separation and photophysical dynamics in polynorbornene chromophore labeled and quencher-labeled block copolymers
- Univ. of Texas, Austin, TX (United States)
Photophysical measurements have been used to characterize a series of well-defined block copolymers labeled with aromatic chromophores and quenchers. These include measurements of (1) energy migration kinetics in the homopolymers and diblock copolymers; (2) solvent effects (CH{sub 2}Cl{sub 2}, THF, THF/CH{sub 3}CN and CHCl{sub 3}) on exciplex emission in the diblock copolymers; (3) temperature effects on the fluorescence and phosphorescence of the diblock copolymers; (4) the dependence of the efficiency of steady-state and time-resolved emission in several triblock copolymers (dicyanobenzene){sub 5}- (phenanthrene){sub n}-(dimethylaniline){sub 5} on relay length (n); and (5) transient absorbance and photoinduced charge separation in these triblock copolymers as a function of relay length. A photoinduced charge separation of 7.2 {mu}s was achieved in a polynorbornyl triblock copolymer bearing a graded series of electron transfer relays: (dicyanobenzene){sub 5}-(phenanthrene){sub 10}-(dimethylaniline) {sub 5}. 31 refs., 14 figs., 5 tabs.
- OSTI ID:
- 249658
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 18 Vol. 118; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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