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