| 光谱学与光谱分析 |
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| Investigation on the Change in C—F Stretching Vibration of FTIR Spectrum by 1H NMR Method |
| LIU Hua-qing,JIANG Feng-chi |
| Center of Analysis and Test，Jiangxi Normal University，Nanchang 330022，China |
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Abstract FTIR spectroscopy and 1H NMR method were used to investigate three organic compounds—1,2-di[-β-(α-methyl-α′-p-substitutephenyl) thiophene]hexafluorocyclo pentene. After assigning all main infrared spectrum peaks，it was observed that the stretching vibration frequency(ν) of C—F band in cyclopentene is rised gradually, and it was found that for compound Ⅰ：νas C—F=1 332.21 cm-1,νs C—F=1 231.91 cm-1 and δC—F=1 159.9 cm-1；for compound Ⅱ：νas C—F=1 338.18 cm-1,νs C—F=1 254.31 cm-1 and δC—F=1 179.22 cm-1；and for compound Ⅲ：νas C—F=1 360.99 cm-1,νs C—F=1 263.29 cm-1 and δC—F=1 194.00 cm-1. The reason for ν change is discussed not only using infrared absorption theory qualitatively but also using 1H NMR method quantitatively. It was also found that for compound Ⅰ H-1=7.503, H-2=7.484；for compound Ⅱ H-1=6.896, H-2=7.465; and for compound Ⅲ：H-1=6.728, H-2=7.413, proveing that the substitution group —F，—OCH2CH3，—N(CH3)2 influences the C—F stretching vibration by the conjugative effect and the inductive effect. The result is satisfactory and it shows that 1H NMR is a powerful tool for infrared spectrum analysis.
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Received: 2006-08-06
Accepted: 2006-11-08
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Corresponding Authors:
LIU Hua-qing
E-mail: jxsdlhq@126.com
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| Cite this article: |
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LIU Hua-qing,JIANG Feng-chi. Investigation on the Change in C—F Stretching Vibration of FTIR Spectrum by 1H NMR Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(11): 2243-2245.
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https://www.gpxygpfx.com/EN/Y2007/V27/I11/2243 |
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