苯丙烯酸及其苯环对位氯取代衍生物的NMR和IR光谱学研究

NMR AND IR SPECTROSCOPIC STUDY OF PHENYL PROPENOIC ACID AND ITS DERIVATIVE P-CL-PHENYL PROPENOIC ACID

作者详细研究了苯丙烯酸及其苯环对位氯代衍生物的核磁共振（ＮＭＲ）和红外线（ＩＲ）光谱学，对各图谱的谱峰作了指证。讨论了反式和顺式结构化合物的ＮＭＲ和ＩＲ光谱学差异性以及苯环对位氯取代的影响，认为反式和顺式结构ＩＲ光谱的不同，主要为两者各自二聚体分子间氢键强弱不同所致；苯环对位氯取代基参与分子π共轭体系，并引起ＮＭＲ和ＩＲ光谱的改变。

The NMR and IR spectroscopy of phenyl propenoic acid and its derivative P-Cl-phenyl propenoic acid was studied in detail. All the peaks in each spectrum were assigned. The NMR and IR spectroscopic difference between the trans- and cis- structure compound and the affection of P-Cl-substitution in benzene ring were discussed. The IR spectroscopic difference between the trans- and cis- structure is mainly due to the different strength of the intermolecular hydrogen bonding in each dimer and to the participation of the P-Cl-substituting group of the benzene ring in theπconjugate system to result in the change of NMR and IR spectra.