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The Microwave Spectrum and Structure of the CH3OHCO Dimer

✍ Scribed by F.J. Lovas; S.P. Belov; M.Y. Tretyakov; J. Ortigoso; R.D. Suenram

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
706 KB
Volume
167
Category
Article
ISSN
0022-2852

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✦ Synopsis

The rotational spectrum of (\mathrm{CH}{3} \mathrm{OH}-\mathrm{CO}) has been observed in the region (7-18 \mathrm{GHz}) with a pulsed-beam Fabry-Perot cavity Fourier-transform microwave spectrometer. In order to obtain detailed structural information the spectra of (\mathrm{CH}{3} \mathrm{OH}, \mathrm{CH}{3} \mathrm{OD}, \mathrm{CD}{3} \mathrm{OH}), and (\mathrm{CD}{3} \mathrm{OD}) combined with (\mathrm{CO}) and ({ }^{13} \mathrm{CO}) were examined. Each of the isotopic species studied exhibits two states, which are interpreted as (A) and (E) symmetry states arising from internal rotation of the methyl group. The (E)-state assignments were verified by observing their first-order Stark effect. The structure of the complex is a bent hydrogen bond of the carbon atom of (\mathrm{CO}) at a distance of (2.41 \AA) from the hydroxyl hydrogen of methanol and planar heavy atoms. The effective barrier to internal rotation for (\mathrm{CH}{3} \mathrm{OH}-\mathrm{CO}, V_{3}=183.0 \mathrm{~cm}^{-1}), is one-half of the value for the methanol monomer. (c) 1994 Academic Pres. Inc.

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