期刊
CHEMICAL PHYSICS LETTERS
卷 504, 期 1-3, 页码 24-28出版社
ELSEVIER
DOI: 10.1016/j.cplett.2011.01.038
关键词
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资金
- Austrian Science Fund [F16]
- DFG-Cluster of Excellence: Munich-Centre for Advanced Photonics
- BMBF
- International Max Planck Research School on Advanced Photon Science
- Alexander von Humboldt Stiftung
- [SFB749]
- Austrian Science Fund (FWF) [F16] Funding Source: Austrian Science Fund (FWF)
We study the charge separation and recombination of two arylamino core-substituted naphthalene diimides by transient absorption. Both compounds show a 3 ps relaxation from the initially excited partial to the full charge transfer state. Quantum chemical calculations show that this process is associated with a twisting of the arylamino substituent. In the twisted conformation the energy gap between ground and excited state is 0.7 eV for two amino core-substituents and 0.5 eV for one amino and one chloro core-substituent. The larger energy gap leads to a six-fold increase in the lifetime of the fully charge separated state from 11 to 70 ps. (C) 2011 Elsevier B. V. All rights reserved.
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