Determination of the anharmonic force constant Ksδδ of the amino group of trifluoroethylamine in 1:1 complexes with bases

The Fermi coupling coefficient W, which measures the intensity of the resonance interaction and is proportional to the anharmonic force constant K sδδ of the amino group, is measured by two independent methods in 1:1 complexes of trifluoroethylamine with bases in dilute CCl 4 solutions. Values of W...

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Bibliographic Details
Published in:Spectrochimica acta. Part A: Molecular spectroscopy 1984, Vol.40 (7), p.687-689
Main Authors: Bertran, Jose Fernandez, Torres, Boris la Serna
Format: Article
Language:English
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Summary:The Fermi coupling coefficient W, which measures the intensity of the resonance interaction and is proportional to the anharmonic force constant K sδδ of the amino group, is measured by two independent methods in 1:1 complexes of trifluoroethylamine with bases in dilute CCl 4 solutions. Values of W from the intensity ratio of Fermi doublet components R, are in good agreement with more precise calculation based on frequencies ν s, ν a and 2δ of the protio species (NH 2) and ν fν b of the monodeutero species (NHD). There is a large sensitivity of W to the p K B of the base but there is no appreciable temperature dependence.
ISSN:0584-8539
DOI:10.1016/0584-8539(84)80124-5