Communication: Spectroscopic observation of the O-bonded T-shaped isomer of the CO-CO2 dimer and two of its intermolecular frequencies

Infrared spectra in the carbon monoxide CO stretch region (≈2150 cm(-1)) are assigned to the previously unobserved O-bonded form of the CO2-CO dimer ("isomer 2"), which has a planar T-shaped structure like that of the previously observed C-bonded form ("isomer 1"), but with the C...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-09, Vol.143 (12), p.121101-121101
Main Authors: Sheybani-Deloui, S, Barclay, A J, Michaelian, K H, McKellar, A R W, Moazzen-Ahmadi, N
Format: Article
Language:English
Subjects:
Bonding
Carbon dioxide
Carbon monoxide
Dimers
Infrared spectra
Molecular structure
T shape
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Summary:Infrared spectra in the carbon monoxide CO stretch region (≈2150 cm(-1)) are assigned to the previously unobserved O-bonded form of the CO2-CO dimer ("isomer 2"), which has a planar T-shaped structure like that of the previously observed C-bonded form ("isomer 1"), but with the CO rotated by 180°. The effective center of mass intermolecular distances are 3.58 Å for isomer 2 as compared to 3.91 Å for isomer 1. In addition to the fundamental band, two combination bands are observed for isomer 2, yielding values for two intermolecular vibrational modes: 14.19 cm(-1) for the in-plane CO bend and 22.68 cm(-1) for the out-of-plane bend.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4932043