Rotational isomerism of ethylamine in the region of the amino group stretching vibrations |
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| Affiliation: | 1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510275, China;3. Guangdong Yuehai Water Investment Co., Ltd., Shenzhen, 518021, PR China |
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| Abstract: | Infrared spectra of C2H5NHD and C2H5ND2 in the region of the amino group stretching vibrations show clearly recognizable splittings due to the presence of the rotamers. In the neat liquid and concentrated carbon tetrachloride solutions of C2H5ND2, the intensity change of two components of the symmetric ND2 stretching vibration with decrease of temperature can be explained by transition of associated molecules in the gauche to such in the trans form. In crystallized C2H5ND2 and C2H5NH2, the reduction of the gauche constituent of the symmetric stretching mode to a weak shoulder confirms the practically exclusive presence of the trans form. |
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