Mid-infrared absorption spectrum of 5,6-dihydroxyindole-2-carboxylic acid

Hidekazu Okuda, Atsushi Nakamura, Kazumasa Wakamatsu, Shosuke Ito, Takayuki Sota

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We report the mid-infrared absorption spectrum of 5,6-dihydroxyindole-2-carboxylic acid (DHICA) solid samples in the wavenumber region ranging from 1000 cm-1 to 4000 cm-1 with resolution of 4 cm-1. Vibrational modes for observed dominant absorption bands of DHICA have been successfully assigned with ab initio density-functional theory calculations. The experimental data also suggest the existence of intermolecular hydrogen bonds.

Original languageEnglish
Pages (from-to)355-359
Number of pages5
JournalChemical Physics Letters
Issue number4-6
Publication statusPublished - 2007 Jan 12


ASJC Scopus subject areas

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

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