Add time:08/26/2019 Source:sciencedirect.com
The far infrared spectrum (350-50 cm−1) of gaseous 2-chloroethanol, ClCH2CH2OH, was recorded at a resolution of 0.10 cm−1. The OH torsional fundamental of the most stable gauche conformer, Gg', where the capital G refers to internal rotation around the CC bond and the lower case g to internal rotation around the CO bond, was observed at 344.0 cm−1 with ‘hot bands’ falling to lower frequency. The ‘hot bands’ are believed to be caused by the OH torsion in excited states of the CC torsion which is observed at 147 cm−1. The corresponding torsional modes were observed for two of the high energy trans conformers, Tg (281.4 cm−1) and Tt (∼200 cm−1). A number of transitions observed in the spectra of the vapor between 250 and 300 cm−1 are assigned to the ClCC bend of the Gg' (299 cm−1), Tt (266 cm−1), and Tg (250 cm−1) conformers with some having associated ‘hot bands’. Additionally infrared spectra of the vapor, amorphous and crystalline solids were recorded, and Raman spectra of the liquid, including depolarization ratios, and of the amorphous and crystalline solids were obtained. The structural parameters, conformational stabilities, barriers to internal rotation and fundamental frequencies were obtained from ab initio calculations utilizing the RHF/6-31++G∗∗ and the MP2/6-31G∗∗ basis sets and the data are compared with the experimental results.
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