Fluorescence of matrix isolated guanine and 7-methylguanine

Krzysztof Polewski, David Zinger, John Trunk, Denise C. Monteleone, John C. Sutherland

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We have prepared argon and nitrogen matrices containing guanine and 7-methylguanine, and measured their absorption, fluorescence excitation and fluorescence emission spectra. The fluorescence excitation spectrum of guanine shows four well-resolved bands in the range from 170 to 290 nm; excitation at the wavelengths of each of these bands results in a fluorescence emission with maximum intensity near 350 nm and a single-exponential decay with a lifetime of about 10 ns. There are significant differences between the fluorescent excitation and emission spectra of guanine and of 7-methylguanine, suggesting that the fluorescence observed from the guanine sample does not arise from a minority tautomer.

Original languageEnglish (US)
Pages (from-to)169-177
Number of pages9
JournalJournal of Photochemistry and Photobiology, B: Biology
Volume24
Issue number3
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

Keywords

  • Absorption
  • Electronic excited states
  • Fluorescence
  • Matrix isolation
  • Phosphorescence
  • Time-resolved fluorescence

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Biophysics
  • Radiology Nuclear Medicine and imaging

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