用光谱法高精度地测量了四种离子液体(ILs)中25种磺酰胺的绝对p K a s,随后将其与常规分子溶剂中的绝对值进行了比较。发现这些磺酰胺的酸度顺序如下:在水中>在DMSO中>在ILs中>在乙腈(ACN)中。众所周知的溶剂极性指数ε不能解释观察到的IL与ε值更大的ACN相比具有更强的弱键作用。此外,回归分析表明,在IL中测定的磺酰胺的p K a s与具有不同特性但斜率不同的分子溶剂中的p K a s线性相关。提出了有关IL中溶剂化作用的基本原理和相关讨论。
estimate of the acid strength of a compound, it has its limitations and is only strictly applicable within the confines of a series of closely similar compounds. The observed pKa values of a large series of polysubstituted phenols were correlated with the predicted values obtained from the Hammett relation, and good agreement obtained, even with substituted picricacids; styphnicacids appear to behave
Willstaetter; Schudel, Chemische Berichte, 1918, vol. 51, p. 785
作者:Willstaetter、Schudel
DOI:——
日期:——
Blanksma, Recueil des Travaux Chimiques des Pays-Bas, 1908, vol. 27, p. 36
作者:Blanksma
DOI:——
日期:——
Absolute p<i>K</i><sub>a</sub>s of Sulfonamides in Ionic Liquids: Comparisons to Molecular Solvents
作者:Zedong Wang、Xin Li、Pengju Ji、Jin-Pei Cheng
DOI:10.1021/acs.joc.6b02182
日期:2016.11.18
Absolute pKas of 25 sulfonamides in four ionic liquids (ILs) were measured spectroscopically with high precision and subsequently compared with those in conventional molecularsolvents. It is found that the acidity order of these sulfonamides is as follows: in water > in DMSO > in ILs > in acetonitrile (ACN). The well-known solvent polarity index ε fails to explain the observed stronger bond-weakening
用光谱法高精度地测量了四种离子液体(ILs)中25种磺酰胺的绝对p K a s,随后将其与常规分子溶剂中的绝对值进行了比较。发现这些磺酰胺的酸度顺序如下:在水中>在DMSO中>在ILs中>在乙腈(ACN)中。众所周知的溶剂极性指数ε不能解释观察到的IL与ε值更大的ACN相比具有更强的弱键作用。此外,回归分析表明,在IL中测定的磺酰胺的p K a s与具有不同特性但斜率不同的分子溶剂中的p K a s线性相关。提出了有关IL中溶剂化作用的基本原理和相关讨论。