Article ID Journal Published Year Pages File Type
10558283 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2005 10 Pages PDF
Abstract
The complicated conformational isomerism of tyrosine is studied by experimental matrix-isolation FT-IR spectroscopy combined with theoretical DFT(B3LYP)/6-31 ++ G** calculations. Not less than 18 possible conformations of tyrosine have been considered theoretically. The results revealed that the most and the less stable forms of neutral tyrosine have the same conformation of the main part of amino acid (conformation II) but they differ in orientation of the phenyl ring. The calculated values of the relative energies suggest that all conformations would be detectable in the experimental spectrum. However, it appeared that it is not possible to distinguish in the experimental spectrum between the bands due to the forms with the same conformation of the main part of amino acid but a different orientation of the phenol ring.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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