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.
Key words：FTIR;1H NMR;Stretching vibration frequency(ν) of C—F band
刘华卿,蒋凤池. 核磁共振氢谱方法对红外光谱碳氟键伸缩振动变化的研究[J]. 光谱学与光谱分析, 2007, 27(11): 2243-2245.
LIU Hua-qing,JIANG Feng-chi. Investigation on the Change in C—F Stretching Vibration of FTIR Spectrum by 1H NMR Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(11): 2243-2245.
