Two-dimensional infrared spectra of the (super 13)C=(super 18)O isotopomers of alanine residue in an alpha-helix

Article Abstract:

The two-dimensional infrared (2D IR) spectra in the amide-I' spectral region of a series of singly (super 13)C=(super 18)O-labeled 25-residue alpha-helix are measured by three-pulse heterodyned spectral interferometry. The analysis of the line shapes of the (super 13)C=(super 18)O diagonal peaks that appeared at approximately 1571.3 plusmn 0.8 cm(sub -1) for all four samples observed wider structural distributions for residues 14 and 11 than those for 12 and 13.

Oxygen, Oxygen isotopes, Carbon compounds

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Local structure of beta-hairpin isotopomers by FTIR, 2D IR, and ab initio theory

Article Abstract:

The 12-residue tryptophan zipper beta-hairpin and two [.super.13.C]-isotopomers were examined in the amide-I region using FTIR and femtosecond two-dimensional infrared (2D IR) spectroscopies. The results suggested a larger structure fluctuation in the terminal region than in the turn region as a result of the side chain effect and solvent-peptide interaction.

Chemical reactions, Fourier transform infrared spectroscopy

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Correlation of the vibrations of the aqueous azide ion with the O-H modes of bound water molecules

Article Abstract:

The correlation of the vibrations of the aqueous azide ion with the O-H modes of bound water molecules is explained. The O-H bonds in water are found to exhibit less frequency fluctuations in the solvent shell, as compared to that exhibited in bulk water.

Analysis, Anisotropy, Hydrogen bonding, Hydrogen bonds, Anions

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