Substitution effects on the excited-state intramolecular proton transfer of salicylic acid: An infrared spectroscopic study on the OH stretching vibrations of jet-cooled 5-methoxysalicylic acid

Eman Abd El-Hakam, Abou El-Nasr, Asuka Fujii, Takayuki Ebata, Naohiko Mikami

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Infrared spectra of jet-cooled 5-methoxysalicylic acid in the 3-μm region were measured for both the electronic ground (S0) and first excited (S1) states. Effects of the methoxy-substitution were investigated in relation to the excited-state intramolecular proton transfer of salicylic acid. Though the electronic absorption-emission spectra exhibit the mirror-image relation, which has been regarded as evidence for the suppression of excited-state intramolecular proton transfer, the infrared spectra showed an extremely large elongation of the phenolic O-H bond upon photoexcitation. The results represent that the significant enhancement of the intramolecular hydrogen bond does occur in S1 of 5-methoxysalicylic.

Original languageEnglish
Pages (from-to)788-793
Number of pages6
JournalChemical Physics Letters
Volume376
Issue number5-6
DOIs
Publication statusPublished - 2003 Jul 31

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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