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Pregled bibliografske jedinice broj: 807967

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


Long, Saran; Wang, Yingying; Vdović, Silvije; Zhou, Zhou; Yan, Linyin; Niu, Yingli; Guo, Qianjin; Xia, Andong
Energy transfer and spectroscopic characterization of a perylenetetracarboxylic diimide (PDI) hexamer // Physical Chemistry Chemical Physics, 17 (2015), 28; 18567-18576 doi:10.1039/C5CP01514F (međunarodna recenzija, članak, znanstveni)


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

Autori
Long, Saran ; Wang, Yingying ; Vdović, Silvije ; Zhou, Zhou ; Yan, Linyin ; Niu, Yingli ; Guo, Qianjin ; Xia, Andong

Izvornik
Physical Chemistry Chemical Physics (1463-9076) 17 (2015), 28; 18567-18576

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Perylenetetracarboxylic diimide; energy transfer; delocalized exciton state

Sažetak
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 (∼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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Silvije Vdović, (262040)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


Uključenost u ostale bibliografske baze podataka:


  • MathSciNet
  • MEDLINE


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