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

Alsindi, W Z and Gardner, D O and 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. ISSN 0009-2614

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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 similar to2136 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 pi-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.