THE INFRARED SPECTRA OF FORMYL FLUORIDE AND DEUTERATED FORMYL FLUORIDE

Abstract

Samples of formyl fluoride and of deuterated formyl fluoride have been examined in the region 2.5 to 25 microns with a Perkin-Elmer double-pass prism spectrometer. Of the six expected fundamentals, for a molecule of point group $C_{S}$ there are five planar vibrations of species $A^{\prime}$ and one nonplanar vibration of species A"". All vibrations of the first species have been assigned. No satisfactory assignment could be made, however, for the remaining non-planar fundamental. The assigned frequencies for the two isotopic molecules satisfy the Teller-Redlich product rule. From frequencies and intensities, there is indication of Fermi resonance occurring between $\nu_{(C-F stretch)}$ and $\nu_{C-D bend}$ in the deuterated compound. A normal coordinate treatment of the molecule will be discussed.