Farhyphen;Infrared and Raman Spectra of Solid Methanol and Methanolhyphen;d4

摘要

The farhyphen;infrared and Raman spectra were obtained of methanol and methanolhyphen;d4at minus;thinsp;185deg;C, and a temperaturehyphen;dependence study of the Raman spectrum was carried out. In the lowhyphen;temperatureagr;phase, splitting of the Csngbnd;O stretching mode was observed in the Raman spectrum but disappeared when the sample was warmed to the highhyphen;temperaturebgr;phase. The coalescence of this band is attributed to the disorder caused by the interchange of the methyl groups above and below the plane of the chain. Four bands were observed at 350, 167, 109, and 57 cmminus;1in the lowhyphen;frequency infrared spectrum of methanol which shifted to 325, 161, 97, and 61 cmminus;1with deuteration. One skeletal mode was observed at 196 cmminus;1in the Raman effect and shifted to 180 cmminus;1with deuteration. It is shown that the spectra arising from the skeletal motions can be interpreted on the basis of linehyphen;group theory in which the linehyphen;group factor group is proposed to beC2for both phases. Also the nature of the molecular motions giving rise to the lowhyphen;frequency bands is discussed in relation to the observed shift factors with deuteration. Possible assignments for the skeletal modes is also given in terms of the factor group of theC22sngbnd;P21space group, but the other suggested space groupC2h2sngbnd;P21sol;mis not consistent with the number of observed farhyphen;infrared bands.