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2D IR photon echo spectroscopy reveals hydrogen bond dynamics of aromatic nitriles

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
469
Identifiers
DOI: 10.1016/j.cplett.2008.12.094
Disciplines
  • Biology
  • Pharmacology
  • Physics

Abstract

Abstract The CN vibrations of two aromatic nitriles, cinnamonitrile, PhCH CH–CN and benzonitrile, PhCN, representative of components of common enzyme inhibitors, are examined by two-dimensional infrared spectroscopy. In methanol, these spectra display cross peaks between the two CN components whose evolution exposes the few picosecond (4.5 ps for CIN and 5.3 ps for BN) equilibrium dynamics of hydrogen bond making and breaking. The main features of the 2D IR spectra are reproduced by simulations only when exchange is incorporated. The lowest free energy state is the non-hydrogen bonded form. Both alkyl and aryl nitriles have now shown this picosecond exchange process.

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