Ultraviolet spectra of coumarins and psoralens

Thomas A. Moore, Marian L. Harter, Pill Soon Song

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


The π → π* transitions of coumarins in the ultraviolet region have been described on the basis of fluorescence polarization, dichroic spectra, and SCF MO CI results. The two lowest π → π* transitions in coumarin, 4-hydroxy-coumarin, and psoralen were found to be polarized nearly parallel to each other, probably along the long molecular axis. The two lowest π → π* transition moments in 8-methoxypsoralen were found to be oriented with a substantial angle between them, in contrast to the case of coumarin and psoralen. It was not possible to identify any n → π* bands as they are probably obscured by the strong π → π* bands.

Original languageEnglish (US)
Pages (from-to)144-157
Number of pages14
JournalJournal of molecular spectroscopy
Issue number1
StatePublished - Oct 1971
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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