Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer

	Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer
	Long, Saran 1; Wang, Yingying 1; Vdovic, Silvije 1,2; Zhou, Meng 1; Yan, Linyin 1; Niu, Yingli 1; Guo, Qianjin 1; Xia, Andong 1
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2015
卷号	17 期号:28 页码:18567-18576
英文摘要	We report a comprehensive study on a newly synthesized perylenetetracarboxylic diimide (PDI) hexamer together with its corresponding monomer and dimer by means of steady-state absorption and fluorescence as well as femtosecond broadband transient absorption measurements. The structure of the PDI hexamer is nearly arranged in a 3-fold symmetry by three identical and separated dimers. This unique structure makes the excited state energy relaxation processes more complex due to the existence of two different intramolecular interactions: a strong interaction between face-to-face PDIs in dimers and a relatively weak interaction between the three separated PDI dimers. The steady-state spectra and the ground state structural optimization show that the steric effect plays a dominant role in keeping the formation of the face-to-face stacked PDI-dimer within the PDI-hexamer, indicating that some level of a pre-associated excimer had formed already in the ground state for the dimer in the hexamer. Femtosecond transient absorption experiments on the PDI hexamer reveal a fast (similar to 200 fs) localization process and a sequential relaxation to a pre-associated excimer trap state from the delocalized exciton state with about 1.2 ps after the initially delocalized excitation. Meanwhile, excitation energy transfer among the three separated dimers within the PDI-hexamer is also revealed by the anisotropic femtosecond pump-probe transient experiments, where the hopping time is about 2.8 ps. A relaxed excimer state is further formed in 7.9 ps after energy hopping and conformational relaxation.
收录类别	SCI
语种	英语
公开日期	2015-10-27
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/27881]
专题	化学研究所_分子反应动力学实验室
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China 2.Inst Phys, Zagreb 10000, Croatia
推荐引用方式 GB/T 7714	Long, Saran,Wang, Yingying,Vdovic, Silvije,et al. Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2015,17(28):18567-18576.
APA	Long, Saran.,Wang, Yingying.,Vdovic, Silvije.,Zhou, Meng.,Yan, Linyin.,...&Xia, Andong.(2015).Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,17(28),18567-18576.
MLA	Long, Saran,et al."Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 17.28(2015):18567-18576.