A pH Scale for the Protic Ionic Liquid Ethylammonium Nitrate

被引：30
|
作者：
Kanzaki, Ryo [1 ]
Kodamatani, Hitoshi [1 ]
Tomiyasu, Takashi [1 ]
Watanabe, Hikari [2 ]
Umebayashi, Yasuhiro [2 ]
机构：
[1] Kagoshima Univ, Grad Sch Sci & Engn, 1-21-35 Korimoto, Kagoshima 8900065, Japan
[2] Niigata Univ, Grad Sch Sci & Technol, Nishi Ku, 8050,Ikarashi 2 No Cho, Niigata 9502181, Japan
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2016年 / 55卷 / 21期
关键词：
acid-base catalysis; acidity; ionic liquids; pH scale; potentiometric titrations; ACID-BASE PROPERTY; FUSED SALT; POTENTIOMETRIC TITRATION; MICELLE FORMATION; BRONSTED ACIDITY; AMMONIUM-NITRATE; AQUEOUS MIXTURES; HEAT-CAPACITIES; PK(A) SCALES; WATER-SYSTEM;
D O I：
10.1002/anie.201511328
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
To quantify the properties of protic ionic liquids (PILs) as acid-base reaction media, potentiometric titrations were carried out in a neat PIL, ethylammonium nitrate (EAN). A linear relationship was found between the 14 pK(a) values of 12 compounds in EAN and in water. In other words, the pK(a) value in EAN was found to be roughly one unit greater than that in water regardless of the charge and hydrophobicity of the compounds. It is possible that this could be explained by the stronger acidity of HNO3 in EAN than that of H3O+ in water and not by the difference in the solvation state of the ions. The pH value in EAN ranges from -1 to 9 on the pH scale based on the pH value in water.
引用
收藏
页码：6266 / 6269
页数：4
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