Ionic Liquid-type Crown Ether as a Novel Medium for a Liquid/Liquid Extraction of Radioactive Metal Ion 85Sr2+

Abstract

1,13-Dichloro-4,7,10-trioxatridecane (2-[2-(1-chloro-2-ethoxy)ethoxy]ethyl chloride) (3a) was synthesized by a chlorination of 1,13-dihydroxy-4,7,10-trioxatridecane (triethylene glycol). And it was treated with imidazole and sodium ethoxide to give the 1N,1N′-tris(oxoethylene)-diimidazole (3b), which was then converted to ionic liquid-type crown ether (ILCE) 3 with a reaction with 1,9-dichloro-3,6-trioxaoctane (2a). Further, the anion of ILCE was exchanged by an anion-exchange method. Ultimately, we developed a very efficient synthetic pathway for ILCEs 1–4 which have various physical and chemical characteristics by a modification of the polyethylene glycol chain length and anions. 85Sr2+ was successfully extracted into the [(3,2)OEtIm][Cl] (3) phase, but it was not extracted into the [(2,2)OEtIm][Cl] (1), [(3,3)OEtIm][Cl] (2), and [(4,3)OEtIm][Cl] (4) phases.

Tribological properties of crown‐type phosphate ionic liquid as additive in poly(ethylene glycol) for steel/steel contacts

“…Cyclo-bis1N, 1N 0 -[(4,7-dioxa)-1,8-octyl]-diimidazolium dis(2-ethylhexyl) phosphate, shorten for [(2,2)OEt-Im][Peh], was synthesized according to the literature (Park et al, 2006). The cation of crown-type phosphate IL was synthesized according to the literature, and anion exchange was conducted to form the target compounds.…”

“…And Park synthesized crown-type ILs first in 2006 (Park et al, 2006), which can discriminate a metal cation according to their ring sizes and be used for the extraction of radionuclides or heavy metals. Crown-type ILs have a large polyoxyethylene ring, which is capable of interacting with metal ions to produce a complex of associates.…”

Tribological behaviors of novel crown‐type phosphate ionic liquids as lubricants for steel/aluminum contacts

“…The crown-type phosphate ILs are composed of crown-type cation and phosphate anion. They were prepared with two steps: the cations of crown-type phosphate ILs were synthesized according to the literature (Park et al, 2006), and anion exchange is conducted to form the target compounds (Jiang et al, 2011). 1-methyl-3-hexylimidazolium tetrafluoroborate (LB106), 1-methyl-3-hexylimidazolium hexafluorophosphate (LP106) were synthesized according to literature (Hagiwara and Ito, 2000;Pierre et al, 1996;Suarez et al, 1998).…”

An 8-sulfonamidoquinoline derivative with imidazolium unit as an extraction reagent for use in ionic liquid chelate extraction systems

“…In other words, the development of novel extraction reagents with high affinity to ILs is an important subject. Thus, several researchers have investigated the possible use of several reagents as extraction reagents in an IL-extraction system [29][30][31][32][33][34][35]. These reagents contain both a cationic imidazolium unit and a neutral complexation unit, and they are classified as task-specific ionic liquids (TSILs) or task-specific onium salts (TSOSs).…”