Photophysical Property of Photoactive Molecules with Multibranched Push-Pull Structures

doi:10.1088/1674-0068/24/05/563-571

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	Photophysical Property of Photoactive Molecules with Multibranched Push-Pull Structures
	Wang, Ying-ying; Ma, Xiao-nan; Vdovic, Silvije; Yan, Lin-yin; Wang, Xue-fei; Guo, Qian-jin; Xia, An-dong
刊名	CHINESE JOURNAL OF CHEMICAL PHYSICS
	2011-10-01
卷号	24 期号:5 页码:563-571
关键词	Branched Intramolecular Charge Transfer Molecule Fluorescence Decay Femtosecond Time-resolved Stimulated Emission Fluorescence Depletion Steady-state Excitation Anisotropy
ISSN号	1674-0068
DOI	10.1088/1674-0068/24/05/563-571
英文摘要	The structure-property characteristics of a series of newly synthesized intramolecular chargetransfer (ICT) compounds, single-branch monomer with triphenylmethane as electron donor and 2,1,3-benzothiadiazole as acceptor, the corresponding two-branch dimer and threebranch trimer, have been investigated by means of steady-state and femtosecond time-resolved stimulated emission fluorescence depletion (FS TR-SEP FD) techniques in different polar solvents. The TD-DFT calculations are further performed to explain the observed ICT properties. The interpretation of the experimental results is based on the comparative studies of the series of compounds which have increased amount of identical branch moiety. The similarity of the absorption and fluorescence spectra as well as strong solvent-dependence of the spectral properties for the three compounds reveal that the excited state of the dimer and trimer are nearly the same with that of the monomer, which may localize on one branch. It is found that polar excited state emerged through multidimensional intramolecular charge transfer from the donating moiety to the acceptor upon excitation, and quickly relaxed to one branch before emission. Even so, the red-shift in the absorption and emission spectra and decreased fluorescence radiative lifetime with respect to their monomer counterpart still suggest some extent delocalization of excited state in the dimer and trimer upon excitation. The similar behavior of their excited ICT state is demonstrated by FS TR-SEP FD measurements, and shows that the trimer has the largest charge-separate extent in all studied three samples. Finally, steady-state excitation anisotropy measurements has further been carried out to estimate the nature of the optical excitation and the mechanism of energy redistribution among the branches, where no plateau through the ICT band suggests the intramolecular excitation transfer process between the branches in dimer and trimer.
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000297139200010
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/72495]
专题	中国科学院化学研究所
通讯作者	Xia, An-dong
作者单位	Chinese Acad Sci, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wang, Ying-ying,Ma, Xiao-nan,Vdovic, Silvije,et al. Photophysical Property of Photoactive Molecules with Multibranched Push-Pull Structures[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2011,24(5):563-571.
APA	Wang, Ying-ying.,Ma, Xiao-nan.,Vdovic, Silvije.,Yan, Lin-yin.,Wang, Xue-fei.,...&Xia, An-dong.(2011).Photophysical Property of Photoactive Molecules with Multibranched Push-Pull Structures.CHINESE JOURNAL OF CHEMICAL PHYSICS,24(5),563-571.
MLA	Wang, Ying-ying,et al."Photophysical Property of Photoactive Molecules with Multibranched Push-Pull Structures".CHINESE JOURNAL OF CHEMICAL PHYSICS 24.5(2011):563-571.