Infra-Red Spectra of Monomeric Formic Acid and Its Deuterated Forms. I. High Frequency Region

Abstract

The hydrogen and deuterium stretching vibrations of the molecules HCOOH, HCOOD, DCOOH, and DCOOD have been studied with a high resolution echelette‐grating infrared spectrometer. From the rotational structure of these bands parameters which are functions of the moments of inertia have been calculated. From these parameters, previous data, and assumptions of the hydrogen bond distances and molecular planarity, the following dimensions of the molecule have been derived: O–H, 0.96±0.01A; C–H, 1.08±0.01A; C=O, 1.225±0.02A; C–O, 1.41±0.02A; O–C=O, 125±1°; C–O–H, 107±5°; H–C=O, 122±5°.