Complementary interpretation of ET(30) polarity parameters of ionic liquids.
Complementary interpretation of ET(30) polarity parameters of ionic liquids.
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DOI：
10.1039/d0cp01480j
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
S. Spange;C. Lienert;Nadine Friebe;K. Schreiter
中科院分区：
文献类型：
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作者：
S. Spange;C. Lienert;Nadine Friebe;K. Schreiter
建立了Reichardt经验ET（30）极性参数作为离子液体合适的极性尺度。本研究采用多元平方相关分析的方法，考察了离子液体的ET（30）与kamlett - taft极性参数α（氢键给予能力）、β（氢键接受能力）和π*（双极性/极化性）以及Catalán参数集SA（溶剂酸度）、SB（溶剂碱度）、SP（溶剂极化性）和SdP（溶剂双极性）之间的关系。为解决这一主要问题，执行了若干子任务。首先，研究了阴离子结构对不同离子液体ET（30）极性参数的影响，使用了九种不同取代的Reichardt型吡啶苯酚甜菜碱染料。假设卤化物阴离子对ET（30）参数有影响。第二部分分别用4-叔丁基-2-（二氨基乙烯）-5-[4-（二乙基氨基）-苄基]-Δ3-thiazoline （Th）和N，N-二乙基-4-硝基苯胺（DENA）分别测定了几种质子离子液体的Kamlet-Taft π*参数，考察了IL的给氢键能力作为探针对实际π*值的影响。采用双氰-双（1,10-菲罗啉）铁（ii）配合物（Fe）作为HBD探针测量α和SA值。最后，在文献数据的基础上，利用新确定的离子液体Reichardt ET（30）、Kamlet-Taft和Catalán参数，证明了ET（30）与α和π*以及ET（30）与SA和SdP的相关性。强调了SdP与离子液体摩尔浓度的线性关系。
Reichardt's empirical ET(30) polarity parameter has been established as appropriate polarity scale for ionic liquids. In this study, the relationships of ET(30) of ionic liquids with the empirical Kamlet-Taft polarity parameters α (hydrogen bond donating ability), β (hydrogen bond accepting ability) and π* (dipolarity/polarizability) as well as Catalán's parameter set SA (solvent acidity), SB (solvent basicity), SP (solvent polarizability) and SdP (solvent dipolarity) are examined by means of multiple square correlation analyses. Several subtasks were carried out to address this main concern. First, the influence of anion structure on ET(30) polarity parameters for various ionic liquids are investigated by use of nine differently substituted pyridinio phenolate betaine dyes of the Reichardt type. It is assumed that halide anions can have an effect on the ET(30) parameter. In the second part, the Kamlet-Taft π* parameters have been independently determined for several protic ionic liquids using 4-tert-butyl-2-(dicyanomethylene)-5-[4-(diethylamino)-benzylidene]-Δ3-thiazoline (Th) and N,N-diethyl-4-nitroaniline (DENA) to show the impact of the hydrogen bond donating ability of the IL on the actual π* values as function of probe. α and SA values have been measured using the dicyano-bis(1,10-phenanthroline) iron(ii) complex (Fe) as HBD probe. Finally, the newly determined Reichardt ET(30), Kamlet-Taft and Catalán parameters of ionic liquids were used in addition to literature data to prove correlations of ET(30) with α and π* as well as of ET(30) with SA and SdP. Linear correlations of SdP with the molar concentration of the ionic liquid are highlighted.