Cation Alkyl Side Chain Length and Symmetry Effects on the Surface Tension of Ionic Liquids was written by Almeida, Hugo F. D.;Freire, Mara G.;Fernandes, Ana M.;Lopes-da-Silva, Jose A.;Morgado, Pedro;Shimizu, Karina;Filipe, Eduardo J. M.;Canongia Lopes, Jose N.;Santos, Luis M. N. B. F.;Coutinho, Joao A. P.. And the article was included in Langmuir in 2014.SDS of cas: 404001-48-5 This article mentions the following:
The surface tension of two series of ILs, R,R’-dialkylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([CnCni.m.][NTf2]), and R-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([CnC1i.m.][NTf2]), and their dependence on temperature (from 298 to 343 K) have been studied. For both series of ILs the surface tension decreased with an increase in the cation side alkyl chain length up to aliphatic chains no longer than hexyl, here labeled as critical alkyl chain length (CACL). For ILs with aliphatic moieties longer than CACL the surface tension displayed an almost constant value up to [C12C12i.m.][NTf2] or [C16C1i.m.][NTf2]. These constant values further converged to the surface tension of long chain n-alkanes, indicating that, for sufficiently long alkyl side chains, the surface ordering was strongly dominated by the aliphatic tails present in the IL. The enthalpies and entropies of surface were also derived and the critical temperatures were estimated from the exptl. data. The trend of the derived thermodn. properties highlights the effect of the structural organization of the IL at the surface with visible trend shifts occurring at a well-defined CACL in both sym. and asym. series of ILs. The structure of a long-alkyl side chain IL at the vacuum-liquid interface was explored using mol. dynamics simulations. For the sym. series of ILs, at the outermost polar layers, more cations pointed one of their aliphatic tails outward and the other inward, relative to the surface, than cations pointing both tails outward. The number of the former, while being the preferred conformation, exceeds the latter by around 75%. In the experiment, the researchers used many compounds, for example, 3-Dodecyl-1-methyl-1H-imidazol-3-ium bis((trifluoromethyl)sulfonyl)amide (cas: 404001-48-5SDS of cas: 404001-48-5).
3-Dodecyl-1-methyl-1H-imidazol-3-ium bis((trifluoromethyl)sulfonyl)amide (cas: 404001-48-5) belongs to imidazole derivatives. Imidazole derivatives generally have good solubility in protic solvents. Simple imidazole derivatives, such as 1H-imidazole, 2-methyl-1H-imidazole, and 1,2-dimethylimidazole, have very high solubility in water. Imidazole based anticancer drug find applications in cancer chemotherapy. It is used as buffer component for purification of the histidine tagged recombinant proteins in immobilized metal-affinity chromatography (IMAC).SDS of cas: 404001-48-5
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem