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题名: Photophysical properties of photoactive molecules with conjugated push-pull structures
作者: Gong, Ying;  Guo, Xunmin;  Wang, Sufan;  Su, Hongmei;  Xia, Andong;  He, Qingguo;  Bai, Fenglian
刊名: JOURNAL OF PHYSICAL CHEMISTRY A
发表日期: 2007-07-05
DOI: 10.1021/jp0705323
卷: 111, 期:26, 页:5806-5812
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The photophysical properties of two newly synthesized photoactive compounds with asymmetrical D-pi-A structure and symmetrical D-pi-A-pi-D structure are investigated in different aprotic solvents by steady-state and femtosecond fluorescence depletion measurements. It is found that the asymmetrical DA compound has larger dipole moment change than that of the symmetrical DAD compound upon excitation, where the dipole moments of the two compounds have been estimated using the Lippert-Mataga equation. Furthermore, the steady-state spectral results show that increasing solvent polarity results in small solvatochromic shift in the absorption maxima but a large red shift in the fluorescence maxima for them, indicating that the dipole moment changes mainly reflect the changes of dipole moment in excited-state rather than in ground state. The red-shifted fluorescence band is attributed to an intramolecular charge transfer (ICT) state upon photoexcitation, which could result in a strong interaction with the surrounding solvents to cause the fast solvent reorganization. The resulting ICT states of symmetrical compounds are less polar than the asymmetrical compounds, indicating the different extents of stabilization of solute-solvent interaction in the excited state. Femtosecond fluorescence depletion measurements are further employed to investigate the fast solvation effects and dynamics of the ICT state of these two novel compounds. The femtosecond fluorescence depletion results show that the DA compound has faster solvation time than that of DAD compound, which corresponds to the formation of relaxed ICT state (i.e., a final ICT state with rearranged solvent molecules after solvation) in polar solvents. It is therefore reasonably understood that the ICT compounds with asymmetrical (D-pi-A) structure have better performance for those photovoltaic devices, which strongly rely on the nature of the electron push-pull ability, compared to those symmetrical compounds (D-pi-A-pi-D).
关键词[WOS]: INTRAMOLECULAR CHARGE-TRANSFER ;  NONLINEAR-OPTICAL PROPERTIES ;  ABSORPTION CROSS-SECTIONS ;  DONOR-ACCEPTOR MOLECULES ;  2-PHOTON ABSORPTION ;  VIBRATIONAL-RELAXATION ;  DYE MOLECULES ;  FLUORESCENCE DEPLETION ;  FLUORENE DERIVATIVES ;  STIMULATED-EMISSION
语种: 英语
WOS记录号: WOS:000247573600027
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140596
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Lab Organ Solid, Inst Chem, Beijing 100080, Peoples R China
2.Chinese Acad Sci, BNLMS, Inst Chem, Beijing 100080, Peoples R China
3.Chinese Acad Sci, State Key Lab Mol React Dynam, Inst Chem, Beijing 100080, Peoples R China

Recommended Citation:
Gong, Ying,Guo, Xunmin,Wang, Sufan,et al. Photophysical properties of photoactive molecules with conjugated push-pull structures[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2007,111(26):5806-5812.
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