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用流动混合微量热计测定了25℃时三个硝基苯甲酸在水-乙醇[0—80％(v/v)]混合溶剂中的电离焓,引用文献⊿G_1~0的插值结果,计算了硝基苯甲酸在相同溶剂中电离过程的熵变。根据溶质在混合溶剂中的迁移焓特征,分析讨论了硝基苯甲酸在水-乙醇混合溶剂中电离焓的变化趋势,认为邻硝基苯甲酸电离焓的特殊性,可能与基团的空间位阻使阴离子的负电荷高度定域有关。
The ionization enthalpies of three nitrobenzoic acids in water-ethanol [0-80% (v / v)] mixed solvents at 25 ℃ were measured by flow-mixing microcalorimeter. The interpolation results of the literature ⊿G_1-0 were calculated Entropy change of nitrobenzoic acid in the same solvent during ionization. According to the enthalpy of migration, the enthalpy change of nitrobenzoic acid in water-ethanol mixed solvent is analyzed and discussed. It is concluded that the enthalpy of ionization of o-nitrobenzoic acid may be related to the space position Resistance to the anion negative charge highly localized.