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Related Experiment Videos

Anharmonicity of amide modes.

Jianping Wang1, Robin M Hochstrasser

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.

The Journal of Physical Chemistry. B
|February 24, 2006
PubMed
Summary
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This study compares experimental and computational data on amide vibrations in peptides. Results link vibrational spectroscopy to peptide secondary structure, aiding molecular analysis.

Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Biophysics

Background:

  • Anharmonic coupling of amide vibrations is crucial for understanding peptide dynamics.
  • Two-dimensional infrared (2D IR) spectroscopy provides detailed insights into these couplings.
  • Density functional theory (DFT) offers a computational approach to model these phenomena.

Purpose of the Study:

  • To compare experimental 2D IR data with DFT calculations for amide vibrations.
  • To evaluate simple models of vibrational mode coupling.
  • To establish criteria for assessing the localization of forces causing anharmonicity.

Main Methods:

  • Utilized density functional theory (DFT) to compute anharmonic vibrational modes.
  • Employed two-dimensional infrared (2D IR) spectroscopy for experimental data acquisition.

Related Experiment Videos

  • Analyzed vibrational energy expansions up to cubic and quartic coupling terms.

    • Main Results:

    • DFT predictions for one- and two-quantum anharmonic modes of amide-A, -I, and -II align well with experimental 2D IR data.
    • Identified criteria for localized forces determining anharmonicity.
    • Off-diagonal anharmonicity is primarily determined by interacting modes, with exceptions for amide-I modes in peptides.

    Conclusions:

    • Anharmonicities are sensitive to peptide structures, enabling linkage to secondary structure determination.
    • The findings aid in interpreting 2D IR experiments for peptide analysis.
    • The vibrational exciton model was evaluated for amide-I transition anharmonicities.