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FTIR study of hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide, and acetonitrile in supercritical CO 2
Author(s) -
Mao Can,
Lu Jie,
Xu Qun,
Chen ShiJuan,
Ke Jie,
Han FluXing,
Yan HaiKe
Publication year - 1999
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19990170304
Subject(s) - chemistry , hydrogen bond , stearic acid , supercritical fluid , acetonitrile , ethanol , dimethyl sulfoxide , fourier transform infrared spectroscopy , molecule , inorganic chemistry , organic chemistry , chemical engineering , engineering
FTIR spectroscopy was used to study the hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide (DMSO), and acetonitrile in supercritical CO 2 at 318. 15 K, and 12.5 and 16.5 MPa. The concentration of the cosolvents range from 0–0.6 mol·L −1 . The area percentage of absorption bands for hydrogen‐bonded and nonhydrogen‐bonded species was Obtained from the IR spectra. The acid and the cosolvents can form hydrogen bond even when their concentrations a very low. At fixed solute concentration, the extent of hydrogen bonding increases with cosolvent concentration. At higher ethanol concentrations, it seems that one stearic acid molecule can hydrogen bond with more than one ethanol molecules simultaneously. It is seen that the strength of the hydrogen bond formed by the acid and the cosolvents is in the order: DMSO ethanol acetonitrile.