木文测定了苯甲酸固体和它在不同溶剂中的红外光谱,根据实验结果分析,我们认为苯甲酸双聚体中C=O键的振动频率应为1694cm.~(-1),而不是1653cm.~(-1(3))。此外并讨论了氢键效应(极性溶剂)与溶剂效应(非极性溶剂)对苯甲酸的v_(c=o)所产生的影响。在非极性溶剂中,由于溶剂介电常数ε的增大,苯甲酸溶液中的频率V_s比其在气态时的频率V_v略有降低,它们之间的关系 是:(V_v-V_s)/V_v=k(ε-1)/(2ε+1)-C According to the analysis of experimental results, we believe that the vibration frequency of C = O bond in benzoic acid dimer should be 1694cm -1 instead of 1653cm . ~ (-1 (3)). In addition, the effect of hydrogen bond effect (polar solvent) and solvent effect (non-polar solvent) on the v_ (c = o) of benzoic acid was also discussed. In non-polar solvents, the frequency V_s in the benzoic acid solution decreases slightly compared to the frequency V_v in the gaseous state due to the increase of the dielectric constant ε, and the relationship between them is: (V_v-V_s) / V_v = k (ε-1) / (2ε + 1) -C