Assignment of the B 1 (Antisymmetric) Ring Deformation in Ethylene Oxide Using High-Resolution FT-IR

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Assignment of the B 1 (antisymmetric) ring deformation in ethylene oxide has been the subject of controversy. This B 1 vibration should produce a type-A IR band, and Lord and Nolin report a Q-branch peak at 892 cm-1 which they assign as the B 1 ring deformation. Thompson and Cave have suggested that the absorption maximum near 840 cm-1 results from this B 1 fundamental. Lord and Nolin obtained a vapor-phase IR spectrum of ethylene oxide-d4, and they assigned the 809 cm-1 type-A band to the B 1 ring deformation. By application of the product rule for the B 1 class in ethylene oxide and ethylene oxide-d4, Lord and Nolin have demonstrated that it is reasonably certain that the B 1 antisymmetric ring deformation must occur near 890 cm-1.

Keywords: Infrared; Molecular structure; Vapor-phase FT-IR

Document Type: Short Communication


Affiliations: Analytical Laboratories, 574 Building, Dow Chemical Company, Midland, Michigan 48667

Publication date: January 1, 1986

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