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Søren Vrønning Hoffmann

Synchrotron radiation linear dichroism (SRLD) investigation of the electronictransitions of quinizarin, chrysazin, and anthrarufin

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  • Department of Physics and Astronomy
  • Institute for Storage Ring Facilities - Aarhus (ISA)

The electronic transitions of the three , (alpha), (alphaPrime) -dihydroxy derivatives of anthraquinone, 1,4-dihydroxy-, 1,8-dihydroxy-, and 1,5-dihydroxy-9,10-anthraquinone (quinizarin, chrysazin, and anthrarufin), were investigated by synchrotron radiation linear dichroism (SRLD) spectroscopy on samples aligned in stretched polyethylene. With synchrotron radiation, polarization data could be determined in the UV region up to ca. 58,000cm-1 (7.2 eV), which amounts to an extension by ca. 11,000cm-1 (1.4 eV) relative to the range accessible with a conventional light source. Throughout the investigated region (15,000-58,000cm-1), essentially similar wavenumbers, intensities, and transition moment directions were determined for chrysazin and anthrarufin, while the spectrum of quinizarin deviated significantly. The results of time-dependent density functional theory (TD-DFT) calculations were in good agreement with the experimental spectra, leading to the assignment of 10 electronic states for quinizarin, and 8 electronic states for chrysazin and anthrarufin. No evidence was found for contributions from different tautomeric or rotameric forms to the observed spectra.

Original languageEnglish
JournalSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Volume77
Issue1
Pages (from-to)279-286
Number of pages8
ISSN1386-1425
DOIs
Publication statusPublished - 15 Sep 2010

    Research areas

  • Hydroxy-anthraquinones, Electronic transitions, Synchrotron radiation, Linear dichroism (LD), Polarization directions, Transition moments, Time-dependent density functional theory (TD-DFT)

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