Polarity of tetraalkylammonium-based ionic liquids and related low temperature molten salts
Polarity of tetraalkylammonium-based ionic liquids and related low temperature molten salts
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DOI：
10.1039/c7nj00443e
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发表时间：
2017-08
影响因子：
3.3
通讯作者：
Gabi Thielemann;S. Spange
中科院分区：
文献类型：
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作者：
Gabi Thielemann;S. Spange
用溶剂化显色法和核磁共振氢谱研究了四烷基铵（R3 N +-CH 3，R = n-C4 H9; n-C8 H17）基离子液体（IL）和低温熔盐（LTMS）的极性随反阴离子的变化.溶剂酸度（SA），溶剂碱度（SB），极化率（SP）和偶极性（SdP）参数已根据加泰罗尼亚规模确定。[感觉（1，10-菲咯啉）2（CN）2]（Fe），3-（4-氨基-3-甲基苯基）-7-苯基苯[1，2-B：4，5-B′]二呋喃-2，6-二酮（ABF），3-（4-N，N-二甲基氨基苯基）-7-苯基苯[1，2-B：4，5-B′]-二呋喃-2，6-二酮（DMe-ABF），4-叔丁基-2-（二氰基亚甲基）-5-[4-（二甲基氨基）苯亚甲基]-Δ3-噻唑啉（Th）和2-[4-（二甲基氨基）苯亚甲基]-Δ3-噻唑啉（Th），（N，N-二甲基氨基）亚苄基]丙二腈（BMN）已被用作溶剂化显色极性指示剂。提出并讨论了阴离子X−的SB参数与R3 N +-CH 3X −的H原子化学位移的函数关系。因此，IL溶剂的碱性（SB）的阴离子决定的相互作用强度对那些CH-键的铵氮原子的直接附近。
Solvatochromic measurements and 1H NMR spectroscopy have been used to investigate the overall polarity of tetraalkylammonium (R3N+–CH3 with R = n-C4H9; n-C8H17) based ionic liquids (IL) and low temperature molten salts (LTMS), respectively, as function of the counter anion. Solvent acidity (SA), solvent basicity (SB), polarizability (SP) and dipolarity (SdP) parameters have been determined according to the Catalan scale. [FeII(1,10-phenanthroline)2(CN)2] (Fe), 3-(4-amino-3-methylphenyl)-7-phenylbenzol[1,2-b:4,5-b′]difuran-2,6-dione (ABF), 3-(4-N,N-dimethylaminophenyl)-7-phenylbenzol[1,2-b:4,5-b′]-difuran-2,6-dione (DMe-ABF), 4-tert-butyl-2-(dicyanomethylene)-5-[4-(dimethylamino)benzylidene]-Δ3-thiazoline (Th), and 2-[4-(N,N-dimethylamino)benzylidene]malononitrile (BMN) have been used as solvatochromic polarity indicators. Significant correlations of the SB parameter of anion X− as a function of the chemical shift of the H-atoms of R3N+–CH3X− are presented and discussed. Thus, IL solvent basicity (SB) of the anion determines the interaction strength towards those CH-bonds in the direct vicinity of the ammonium nitrogen atom.