A highly efficient and eco‐friendly esterification was achieved by a series of novel dicationicacidicionicliquids (DAILs) containing double SO3H cations. High yields of the product esters were obtained by using 2 mol% of the DAILs as catalysts and DAIL I could be reused at least ten times without appreciable loss of its efficicency.
一个高效和环境友好的酯化物通过一系列的含有双新颖的双阳离子的酸性离子液体(DAILs)实现 SO 3个ħ阳离子。通过使用2mol%的DAIL作为催化剂获得了高产率的产物酯,并且DAIL I可以重复使用至少十次而不会明显降低其效率。
Structural factors to improve physico-chemical properties of zwitterions as ion conductive matrices
作者:Asako Narita、Wataru Shibayama、Hiroyuki Ohno
DOI:10.1039/b515287a
日期:——
Thermal properties and ion conductive characteristics of equimolar mixtures of zwitterion and lithium salts (Z/L mixtures) have been investigated. Through a systematic study of their structure–property relationship, we describe a zwitterion structure that produces high ionic conductivity when the zwitterion is mixed with lithium salt. We found that a pure zwitterion containing imide anion melted at 87 °C and the melting point of pure zwitterions was lowered in proportion to the alkyl spacer chain length between the anion and cation sites. In Z/L mixtures, ionic liquid-like domain formed between the cation sites of zwitterions and the anions of lithium salts regardless of the anion structure of the zwitterions. However, the anion structure affected the transference number of the lithium cation in the Z/L mixtures. To improve the thermal stability and the ionic conductivity of Z/L mixtures, suitable alkyl chain length between the cation and anion sites was determined to be 5 to 7 CH2 units.
Lithium Salts of Pyrroldinium Type Zwitterion and the Preparation Method of the Same
申请人:Kim Hong-Gon
公开号:US20080193853A1
公开(公告)日:2008-08-14
Disclosed are a pyrrolidinium type sulphonated zwitterion, a method of preparing the same, a lithium salt prepared by using the same, a method of preparing the salt, an electrolytic composition containing the salt and a lithium secondary battery including the electrolytic composition. Since the pyrrolidinium type sulphonated zwitterions prepared according to the invention are thermally and electrochemically stable, the lithium salt prepared by using the same exhibits a lower hygroscopicity than the conventional lithium salts and strong thermal and electrochemical stabilities. When the lithium salt of the invention is dissolved in an organic solvent independently or together with the ionic liquid, excellent conductivity and electrochemical stability are exhibited. Accordingly, the lithium salt of the invention is very suitable for the electrolyte of the lithium secondary battery.