THE ELECTRONIC SPECTROSCOPY OF PYRIMIDINES: THE EFFECT OF COVALENTLY BONDED SULFUR ON THE PHOSPHORESCENCE AND ABSORPTION SPECTRA

Henry J. Pownall, Arnold M. Schaffer, Ralph S. Becker, William W. MANTULIN

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Abstract— The phosphorescence of uracil, 2‐thiouracil, 2,4‐dithiouracil and 2‐mercaptopyrimidine was studied at 77 K. 2‐Thiouracil and 2,4‐dithiouracil showed phosphorescence quantum yields of 0.65 and 0.1, respectively. The emitting triplet states of these compounds have been assigned as the 3(π, π*) type. The enhancement of spin‐orbit coupling through the involvement of the 3d orbitals on sulfur has been invoked in describing emission characteristics of thiouracils.

Original languageEnglish (US)
Pages (from-to)625-628
Number of pages4
JournalPhotochemistry and photobiology
Volume27
Issue number5
DOIs
StatePublished - 1978

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry
  • Physical and Theoretical Chemistry

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