Hexyl hexafluorophosphate

Harris KR, Kanakubo M, Woolf LA (2007) Temperature and pressure dependence of the viscosity of the ionic liquids l-hexyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. J Chem Eng Data 52 1080-1085... 

Theoretically, a trillion or more ionic liquids are possible. To make an ionic liquid, researchers can select it from dozens of small, negatively charged ions, such as hexafluorophosphate ([PFs]-) and tetrafluoro-borate ([BF4]-), and hundreds of thousands of larger, positively charged ions, such as l-hexyl-3-methylimida-zolium or l-butyl-3methylimidazolium. 

Chakrabarty, D., Chakraborty, A., Seth, D., and Sarkar, N. 2005. Effect of water, methanol, and acetonitrile on solvent relaxation and rotational relaxation of Coumarin 153 in neat l-hexyl-3-methylimidazolium hexafluorophosphate. J. Phys. Chem. A 109, 1764-1769. 

Modified graphene oxide was prepared using alkyl imidazol-ium ionic liquids (l-butyl-3-methylimidazolium tetrafluoroborate, l-butyl-3-methylimidazolium hexafluorophosphate and l-hexyl-3-methyhmidazolium bis(trifluoromethylsulfonyl) amide via an epoxide ring-opening reaction, cation-p stacking, or van der Waals interactions, with modified graphene exfoliated from a graphite rod by a moderate electrochemical method as a a comparative material (3). 

Ionic liquids l-ethyl-3-methylimidazolium diethylphosphate EMIMDEP, l-butyl-3-methylimidazolium hexafluorophosphate EMIMPF6, l-hexyl-3-methylitnidazolium chloride HMIMCl, l-butyl-3-methylimidazolium trifluoromethanesulfonate BMIM OTf, l-butyl-3-methylimidazolium tetrafluoroborate EMIMEF4, trihexyltetradecylphosphonium chloride HPCl, and l-butyl-3-methylimidazolium chloride EMIMCl were sup>plied by Alrdich. Composition of a typical elastomer mixture rubber - 100 phr, DCP - 2 phr, TAC - 0.5 phr, ZnO - 5 phr, MET - 2 phr, S - 2 phr, Ionic liquids - 3 phr, filler 20-100 phr. 

Plate 13 H NMR spectrum of l-Hexyl-3-methylimidazoiium hexafluorophosphate [hexmimjPFo... 

So far in this text, you have seen that ionic substances are stable solids with high melting points. For example, / sodium chloride has a melting point near 800°C. One of the hottest areas of current chemical research is ionic liquids—substances composed of ions that are liquids at normal temperatures and pressures. This unusual behavior results from the differences in the sizes of the anions and cations in the ionic liquids. Dozens of small anions, such as BF4 (tetrafluoroborate) or PFg (hexafluorophosphate), can be paired with thousands of large cations, such as 1-hexyl-3-methylimidazolium or l-butyl-3-methylimidazolium (parts a and b respectively, in the accompanying figure). These substances remain liquids because the bulky, asymmetrical cations do not pack together efficiently with the smaller,... 

McFarlane et alP measured the solubility of methylimidazolium-based bis[(trifluo-romethane)sulfonyl]imides, and found that when the length of the alkyl chain increased from 1-butyl, 1-hexyl, to 1-octyl, the solubility of the ionic liquid decreased from 16 mM to 4.7 mM at 22°C. When the 1-butyl form was combined with a more hydrophilic anion (hexafluorophosphate), the solubility of that ionic liquid was 63 mM. The chemical composition of the anion affected the solubility of foiu alkylimidazolium-based ionic liquids. " When the anion was bis[(trifluoromethyl)sulfonyl]azanide, the ionic liquids were less soluble in water when the anion was hexafluorophosphate. For example, the solubility of 1-butyl-3-methylimidazolium hexafluorophosphate was 2.12 wt% whereas the solubility of the relatively more hydrophobic 1-butyl-2,3-dimethylimidazolium bis[(trifluorom-ethyl)sulfonyl]azanide was measured as 0.61 weight percent. Overall, the solubility of each ionic liquid did not exceed 0.075 mM. 

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