Characterization of ultrafast intramolecular charge transfer dynamics in pyrenyl derivatives: Systematic change of the number of peripheral N,N -dimethyaniline substituents

Jooyoung Sung, Pyosang Kim, Yoen Ok Lee, Jong Seung Kim, Dongho Kim

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We have comparatively investigated the charge transfer (CT) dynamics of a series of covalently linked N,N-dimethylaniline (DMA) and pyrenyl derivatives (N1, N2C, N2T, N3, and N4, where 1, 2, 3, and 4 represent the number of DMA groups, and C and T are abbreviations for cis and trans, respectively). Their CT characters have been estimated in the order of N1 > N2C ≅ N2T > N3 > N4 by an increase of Stokes shift with increasing the solvent polarity. The femtosecond time-resolved fluorescence spectra show very early excited-state dynamics, a transition from the initially populated locally excited (LE) state to the CT state. The spectral analysis reveals that CT stabilization processes of N2T and N4 are relatively constant in comparison with those of N1, N2C, and N3. These results indicate that the CT characters of N1, N2C, N2T, N3, and N4 molecular systems are strongly influenced by the number and position of donor (DMA) groups onto the acceptor (pyrene) moiety.

Original languageEnglish (US)
Pages (from-to)818-823
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume2
Issue number7
DOIs
StatePublished - Apr 7 2011

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Charge transfer
charge transfer
Derivatives
Excited states
abbreviations
Pyrene
pyrenes
Electron transitions
Spectrum analysis
excitation
spectrum analysis
polarity
Stabilization
stabilization
Fluorescence
fluorescence
shift

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

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title = "Characterization of ultrafast intramolecular charge transfer dynamics in pyrenyl derivatives: Systematic change of the number of peripheral N,N -dimethyaniline substituents",
abstract = "We have comparatively investigated the charge transfer (CT) dynamics of a series of covalently linked N,N-dimethylaniline (DMA) and pyrenyl derivatives (N1, N2C, N2T, N3, and N4, where 1, 2, 3, and 4 represent the number of DMA groups, and C and T are abbreviations for cis and trans, respectively). Their CT characters have been estimated in the order of N1 > N2C ≅ N2T > N3 > N4 by an increase of Stokes shift with increasing the solvent polarity. The femtosecond time-resolved fluorescence spectra show very early excited-state dynamics, a transition from the initially populated locally excited (LE) state to the CT state. The spectral analysis reveals that CT stabilization processes of N2T and N4 are relatively constant in comparison with those of N1, N2C, and N3. These results indicate that the CT characters of N1, N2C, N2T, N3, and N4 molecular systems are strongly influenced by the number and position of donor (DMA) groups onto the acceptor (pyrene) moiety.",
author = "Jooyoung Sung and Pyosang Kim and Lee, {Yoen Ok} and Kim, {Jong Seung} and Dongho Kim",
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Characterization of ultrafast intramolecular charge transfer dynamics in pyrenyl derivatives : Systematic change of the number of peripheral N,N -dimethyaniline substituents. / Sung, Jooyoung; Kim, Pyosang; Lee, Yoen Ok; Kim, Jong Seung; Kim, Dongho.

In: Journal of Physical Chemistry Letters, Vol. 2, No. 7, 07.04.2011, p. 818-823.

Research output: Contribution to journalArticle

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AU - Kim, Dongho

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N2 - We have comparatively investigated the charge transfer (CT) dynamics of a series of covalently linked N,N-dimethylaniline (DMA) and pyrenyl derivatives (N1, N2C, N2T, N3, and N4, where 1, 2, 3, and 4 represent the number of DMA groups, and C and T are abbreviations for cis and trans, respectively). Their CT characters have been estimated in the order of N1 > N2C ≅ N2T > N3 > N4 by an increase of Stokes shift with increasing the solvent polarity. The femtosecond time-resolved fluorescence spectra show very early excited-state dynamics, a transition from the initially populated locally excited (LE) state to the CT state. The spectral analysis reveals that CT stabilization processes of N2T and N4 are relatively constant in comparison with those of N1, N2C, and N3. These results indicate that the CT characters of N1, N2C, N2T, N3, and N4 molecular systems are strongly influenced by the number and position of donor (DMA) groups onto the acceptor (pyrene) moiety.

AB - We have comparatively investigated the charge transfer (CT) dynamics of a series of covalently linked N,N-dimethylaniline (DMA) and pyrenyl derivatives (N1, N2C, N2T, N3, and N4, where 1, 2, 3, and 4 represent the number of DMA groups, and C and T are abbreviations for cis and trans, respectively). Their CT characters have been estimated in the order of N1 > N2C ≅ N2T > N3 > N4 by an increase of Stokes shift with increasing the solvent polarity. The femtosecond time-resolved fluorescence spectra show very early excited-state dynamics, a transition from the initially populated locally excited (LE) state to the CT state. The spectral analysis reveals that CT stabilization processes of N2T and N4 are relatively constant in comparison with those of N1, N2C, and N3. These results indicate that the CT characters of N1, N2C, N2T, N3, and N4 molecular systems are strongly influenced by the number and position of donor (DMA) groups onto the acceptor (pyrene) moiety.

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