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FTIR study of hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide,and acetonitrile in supercritical CO2

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【作者】 毛灿鲁洁许群陈世娟柯杰韩布兴闫海科

【Author】 MAO, Can LU, Jie XU, Qun CHEN, Shi-Juan KE, Jie HAN, Bu-Xing YAN, Hai-KeInstitute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

【机构】 Institute of ChemistryChinese Academy of SciencesBeijing 100080ChinaChina

【摘要】 <正>FTIR spectroscopy was used to study the hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide (DMSO),and acetonitrile in supercritical CO2 at 318.15 K, and 12.5 and 16.5 MPa. The concentrations 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 are very low. At fixed solute concentration, the extent of hydrogenbonding 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.

【Abstract】 FTIR spectroscopy was used to study the hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide (DMSO),and acetonitrile in supercritical CO2 at 318.15 K, and 12.5 and 16.5 MPa. The concentrations 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 are very low. At fixed solute concentration, the extent of hydrogenbonding 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.

【基金】 Special article from the First International Workshop on Green Chemistry, the University of Science;Technology of China, Hefei, China, May, 1998.;Project (No. 29633020 and 629725308) supported by the National Natural Science Foundation of China.
  • 【文献出处】 Chinese Journal of Chemistry ,中国化学(英文版) , 编辑部邮箱 ,1999年03期
  • 【分类号】O657.3
  • 【被引频次】1
  • 【下载频次】5
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