Time-dependent blue shift of the fluorescence origin band of benzo[a]pyrene (BP)-derived BP-6-N7Ade adducts in glasses

Cheng-Huang Lin, D. Zamzow, G. J. Small, R. Jankowiak

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report unusual spectroscopic properties of the benzo-[a]pyrene (BP)-derived one-electron oxidation DNA adduct. BP-6-N7Ade, in glasses at low temperatures. Time-resolved fluorescence emission and fluorescence excitation spectra showed that the position of the origin bands shift to higher energies with longer delay time of the observation window. A non-linear and time-dependent Stokes shift has been revealed. This effect has not been observed for any BP-derived diol-epoxide adduct. Such a blue-shift, in opposite direction to the shift expected from solvation dynamics, has not been previously reported. The experimental data are interpreted in terms of a distribution of conformers and a matrix-induced frequency dependent dipole moment change across the inhomogeneously broadened absorption band.

Original languageEnglish
Pages (from-to)43-52
Number of pages10
JournalPolycyclic Aromatic Compounds
Volume1999
Issue number14-15
Publication statusPublished - 1999 Dec 1

Fingerprint

Benzo(a)pyrene
Pyrene
Fluorescence
Glass
DNA Adducts
Epoxy Compounds
Solvation
Dipole moment
Absorption spectra
Time delay
Oxidation
Electrons
Temperature
7-(benzo(a)pyren-6-yl)adenine
Direction compound

Keywords

  • BP-6-N7Ade adduct
  • Benzo[a]pyrene
  • Fluorescence spectroscopy
  • One-electron oxidation adduct
  • Stokes shift

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Time-dependent blue shift of the fluorescence origin band of benzo[a]pyrene (BP)-derived BP-6-N7Ade adducts in glasses. / Lin, Cheng-Huang; Zamzow, D.; Small, G. J.; Jankowiak, R.

In: Polycyclic Aromatic Compounds, Vol. 1999, No. 14-15, 01.12.1999, p. 43-52.

Research output: Contribution to journalArticle

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AU - Zamzow, D.

AU - Small, G. J.

AU - Jankowiak, R.

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N2 - We report unusual spectroscopic properties of the benzo-[a]pyrene (BP)-derived one-electron oxidation DNA adduct. BP-6-N7Ade, in glasses at low temperatures. Time-resolved fluorescence emission and fluorescence excitation spectra showed that the position of the origin bands shift to higher energies with longer delay time of the observation window. A non-linear and time-dependent Stokes shift has been revealed. This effect has not been observed for any BP-derived diol-epoxide adduct. Such a blue-shift, in opposite direction to the shift expected from solvation dynamics, has not been previously reported. The experimental data are interpreted in terms of a distribution of conformers and a matrix-induced frequency dependent dipole moment change across the inhomogeneously broadened absorption band.

AB - We report unusual spectroscopic properties of the benzo-[a]pyrene (BP)-derived one-electron oxidation DNA adduct. BP-6-N7Ade, in glasses at low temperatures. Time-resolved fluorescence emission and fluorescence excitation spectra showed that the position of the origin bands shift to higher energies with longer delay time of the observation window. A non-linear and time-dependent Stokes shift has been revealed. This effect has not been observed for any BP-derived diol-epoxide adduct. Such a blue-shift, in opposite direction to the shift expected from solvation dynamics, has not been previously reported. The experimental data are interpreted in terms of a distribution of conformers and a matrix-induced frequency dependent dipole moment change across the inhomogeneously broadened absorption band.

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KW - Stokes shift

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