Abstract
Fermi resonance parameters for the Fermi doublet in the carbonyl stretching region of some deuterioformate esters (DCOOR: R= CH 3, CH 2CH 3 and CH 2CH) have been measured by solvent variation method. The results are in good agreement with the idea that in the case of all deuterioformate esters the Fermi resonance is caused by the first overtone of the D-C out-of-plane bending mode which resonates with the CO stretching mode. Attempts to measure the Fermi resonance parameters for tert-butyl deuterioformate (DCOOC(CH 3) 3) have been made. The existence of the conformational E and Z isomers, however, gives rise to two weak additional shoulders and the measurement of the integrated intensities of these bands with the Cauchy-Gauss sum function, used in this work, failed.
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