Formation of a CO-CH₄ complex in thin solid films below 50 K

Alsindi, W. Z.; Gardner, D. O.; van Dishoeck, E. F. and Fraser, H. J. (2003). Formation of a CO-CH₄ complex in thin solid films below 50 K. Chemical Physics Letters, 378(1-2) pp. 178–184.

DOI: https://doi.org/10.1016/S0009-2614(03)01288-0

URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

We have investigated the physical and chemical behaviour of pure-, mixed-, layered-, and thin-solid films of CO and CH₄ using Fourier Transform Infrared Spectroscopy. Very little difference exists between the sublimation behaviour of the films. In contrast, a significant spectral feature was observed at ~2136 cm⁻¹ only in the mixed CO:CH₄ films, and was replicated by ab initio calculations on the gas-phase CO–CH₄ complex. The complex is due to a ‘pseudo-double π-hydrogen bond’, with binding energy of around 14 kJ mol⁻¹. To the best of our knowledge this is the first report of this complex.

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