Abstract
Abstract Gaseous glycol monoformate has been studied at 110 °C by means of electron diffraction and, at 150 °C, by infrared spectroscopy. Two conformations, both with internal hydrogen bonds, were found in the electron diffraction investigation. In the first rotamer the hydrogen bonding exists between the O-H oxygen atom and the double bonded carbonyl oxygen atom, in the second rotamer between the O-H oxygen atom and the ester oxygen atom. Both isomers have a gauche conformation. The hydrogen-bond lengths O β O of the two gauche conformations were found to be 2.785 ± 0.010 A and 2.806 ± 0.010 A respectively. The O-H stretching vibration is shifted from 3670 cm−1, the value in glycol, to 3430 cm−1. The CO stretching vibration band consists of two peaks, which were separately assigned to the two gauche isomers. Structural parameters are given in Table 2.
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