期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 290, 期 -, 页码 22-30出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2014.06.002
关键词
Molecular configuration; Two-photon absorption; Charge transfer performance; Excited-state dipoles
资金
- National Natural Science Foundation of China [21074144, 21102156, 51273209]
- Ningbo International Cooperation Foundation [2012D10009, 2013D10013]
- State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
- Chinese Academy of Sciences [GJHZ1219]
Two novel octupolar molecules including benzoimidazole electron-accepting (A) branches and a triphenylamine electron-donating (D) center have been synthesized and characterized (p-ETBN and m-ETBN). Their photophysical and photochemical properties were investigated systematically including single-photon absorption, two-photon absorption (2PA) and charge transfer performance. Their 2PA properties have been investigated by the open aperture Z-scan technique, and the values of the 2PA cross section at 800 nm for p-ETBN and m-ETBN are similar to 300 GM and similar to 100 GM, respectively. Interestingly, both of them have the same D, A and pi-conjugating units with only the different molecular configuration, the 2PA response of them differs by almost three times, which are found to be the different excited-state dipole moments and intramolecular charge-transfer. Our results reveal, a new rule of molecular design for obtaining some excellent 2PA materials for their potential biophotonic and optoelectronic applications. (C) 2014 Elsevier B.V. All rights reserved.
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