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本文测量了N~-取代苯氨基乙酸(RPhG,R=p-OCH_3,p-CH_3,m-CH_3,-H,m-OCH_3,p-Cl,m-Cl,m-NO_2,p-NO_2)在正己烷、正庚烷、二氧六环、四氯化碳、苯、甲苯、氯笨、乙酸乙酯、乙醇、乙腈、30％乙醇-水、不同比例的乙醇-正庚烧等溶剂中的紫外吸收光谱。实验结果显示:(1)与苯相比,RPhG在各溶剂中的紫外吸收峰均发生红移。(2)RPhG在各溶剂中的第一吸收谱带吸收频率ν与RPhG的碱性强度pK_2值、理论计算的电子跃迁能ΔE之间呈较好的直线关系。(3)在非极性溶剂中,RPhG的ν值与溶剂特性函数f(n~2)之间呈直线关系。在极性溶剂中,ν与溶剂特性函数f之间呈直线关系,[ν-(AL_0+B)f(n~2)]与溶剂特性函数φ-φ(n~2)之间也呈直线关系。(4)在不同溶剂中,同一取代基RPhG的ν~R对未取代PhG的ν~H之间存在着线性关系。
In this paper, the effects of N ~ -substituted phenylaminoacetic acid (RPhG, p = OCH_3, p_CH_3, m_CH_3, -H, m_OCH_3, pCl_2, m_Cl, In n-hexane, n-heptane, dioxane, carbon tetrachloride, benzene, toluene, stupid, ethyl acetate, ethanol, acetonitrile, 30% ethanol - water, different proportions of ethanol - UV absorption spectrum. The experimental results show that: (1) compared with benzene, RPhG in each solvent UV absorption peak redshift. (2) The first absorption band of RPhG in each solvent absorption frequency ν and RPhG alkaline strength pK_2 value, the theoretical calculated electron transition energy ΔE between a good linear relationship. (3) In apolar solvents, the ν value of RPhG has a linear relationship with the solvent characteristic function f (n ~ 2). In a polar solvent, ν has a linear relationship with the solvent characteristic f, and a straight line between [ν- (AL_0 + B) f (n ~ 2)] and the solvent characteristic function φ-φ relationship. (4) In different solvents, there is a linear relationship between ν ~ R of the same substituent RPhG and ν ~ H of the unsubstituted PhG.