Abstract
Infrared spectra of acrylyl chloride have been measured in argon and nitrogen matrices, in a heated vapor cell, and in a long path vapor cell. The results reaffirm the earlier conclusion of Katon and Feairheller ( J. Chem. Phys. 47, 1248 (1967)) that vapor phase acrylyl chloride exists as a mixture of two rotational conformers. The new information leads to an assignment of the 18 fundamental modes of the s- trans rotamer and to many of those of the second (s- cis) rotamer. Several frequencies appear to be insensitive to isomerization. The potential energy difference between the two rotamers appears to be small in the vapor phase and the potential energy barrier separating the two minima is sufficiently high that direct matrix isolation of both rotamers is possible before relaxation to the low energy form can occur.
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