Phosphonium Chloromercurate Room Temperature Ionic Liquids of Variable Composition

Abstract

The system trihexyl(tetradecyl)phosphonium ([P 66614 ]Cl)/mercury chloride (HgCl 2 ) has been investigated by varying the stoichiometric ratios from 4:1 to 1:2 (25,50,75, 100, 150, and 200 mol % HgCl 2 ). All investigated compositions turn out to give rise to ionic liquids (ILs) at room temperature. The prepared ionic liquids offer the possibility to study the structurally and compositionally versatile chloromercurates in a liquid state at low temperatures in the absence of solvents. [P 66614 199 Hg NMR, Raman-and UV−vis spectroscopy, and cyclic voltammetry, among other techniques, and their densities and viscosities were determined. The [P 66614 ]Cl/HgCl 2 system shows similarities to the well-known chloroaluminate ILs (e.g., decrease in viscosity with increasing metal content after addition of more than 0.5 mol of HgCl 2 /mol [P 66614 ]Cl, increasing density with increasing metal content, and the likely formation of polynuclear/polymeric/ polyanionic species) but offer the advantage that they are air and water stable.

Lewis Acidic Ionic Liquids

“…Raman, ab initio [47] Zn(II) Crystal structure [50], 199 Hg NMR, Raman [51], EXAFS [52] Al(III) 27 Al NMR [20] 71 Ga NMR, EXAFS [53][54][55] In(III)…”

An ionic liquid process for mercury removal from natural gas

“…acidic, compositions. While little is known about the phase behaviour of chloromercurate(II) ionic liquids with χ HgCl 2 , 38,39 the limiting point for homogeneity in chlorocuprate(I) systems is χ CuCl = 0.67, 34 that is, with the copper : chloride ratio of 2 : 3.…”

Mercury capture on a supported chlorocuprate(ii) ionic liquid adsorbent studied using operando synchrotron X-ray absorption spectroscopy

“…Such dimeric anions have been observed in the crystal structures of some imidazolium halomercurate(II) salts 24 and have been proposed as components of ionic liquid based on 199 Hg NMR spectroscopy. 19 Operando examination of supported ionic liquid adsorbent For the operando study of mercury capture, nitrogen carrier gas containing 2000 ng dm 3 of elemental mercury vapour was passed through the supported ionic liquid adsorbent column (60 mg, 0.3 × 20 mm) with a flow rate of 190 cm 3 min −1 . XAS (fluorescence, Cu and Hg EXAFS) data were collected sequentially at five positions along the bed, scanning approximately the first 5.5 mm of the supported ionic liquid.…”