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作者测定了有机溶剂-水二元混合溶剂体系中2,2,6,6-四甲基哌啶-1-氧自由基(TMPO)的ESRa_N 值.这类混合溶剂体系中 a_N-m 关系可归属有机二元混合溶剂体系的四种典型线型关系.比较了几种溶剂极性经验参数,说明各种经验极性参数-m 关系图的差异是特定模型反应中溶剂分子与溶质分子间相互作用不同的反映.对二元混合溶剂体系而言,a_N-E_T(30),a_N-Z 一般不具有线性关系,认为溶剂极性经验参数是溶剂(包括溶剂混合物)对模型化合物溶剂化能力的标度,给出了在各种溶剂体系中的 a_N 测定值,作为溶剂对中性偶极分子相对溶剂化能力的经验标度.
The authors determined the ESRa_N value of 2,2,6,6-tetramethylpiperidine-1-oxyl free radical (TMPO) in the organic solvent-water binary mixed solvent system. The a_N-m relationship in this mixed solvent system The four typical linear relationships of organic binary mixed solvent system.The comparison of several solvent polarity empirical parameters shows that the difference of the empirical polarity parameter-m relationship is the interaction between solvent molecules and solute molecules in a specific model reaction For the binary mixed solvent system, a_N-E_T (30) and a_N-Z generally do not have a linear relationship, and the empirical parameter of solvent polarity is considered as the solvent (including the solvent mixture) of the solvent of the model compound The scale gives the measured a_N in various solvent systems as an empirical measure of the solvent’s relative solvating ability to neutral dipole molecules.