ADDITIVE SUBSTITUENT EFFECTS ON IONIZATION OF META-SUBSTITUTED PHENOLS
ADDITIVE SUBSTITUENT EFFECTS ON IONIZATION OF META-SUBSTITUTED PHENOLS
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DOI：
10.1071/ch9681541
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发表时间：
1968-01-01
影响因子：
1.1
通讯作者：
KUDRYNSK.J
中科院分区：
文献类型：
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作者：
BOLTON, PD;HALL, FM;KUDRYNSK.J
在5-60°温度范围内，用分光光度法测量了3-乙氧基苯酚、3，5-二乙氧基苯酚、3，5-二氯苯酚、3，5-二溴苯酚、3，5-二碘苯酚和3，5-二硝基苯酚的热力学电离常数，并计算了电离热力学函数ΔG25、ΔH25、ΔS25和ΔCp.25。这些结果，与其他测量先前，表明，对于这个反应系列，取代基的电离自由能的影响是精确的添加剂，和电离熵密切添加剂。根据Hepler的内/外焓理论对结果进行了评估。
Thermodynamic ionization constants of 3-ethoxyphenol; 3,5-diethoxyphenol, 3,5-dichlorophenol, 3,5-dibromophenol, 3,5-diiodophenol, and 3,5-dinitrophenol have been measured spectrophotometrically within the temperature range 5-60°, and the thermodynamic functions of ionization ΔG25, ΔH25, ΔS25, and ΔCp.25 calculated. These results, in conjunction with others measured previously, indicate that, for this reaction series, substituent effects on the free energies of ionization are precisely additive, and on the entropies of ionization closely additive. An assessment of the results in terms of Hepler's internal/external enthalpy theory is made.