Aqueous biphasic systems composed of ionic liquids and polypropylene glycol: insights into their liquid-liquid demixing mechanisms was written by Neves, Catarina M. S. S.;Shahriari, Shahla;Lemus, Jesus;Pereira, Jorge F. B.;Freire, Mara G.;Coutinho, Joao A. P.. And the article was included in Physical Chemistry Chemical Physics in 2016.Product Details of 125652-55-3 This article mentions the following:
Novel ternary phase diagrams of aqueous biphasic systems (ABSs) composed of polypropylene glycol with an average mol. weight of 400 g mol-1 (PPG-400) and a vast number of ionic liquids (ILs) were determined The large array of selected ILs allowed us to evaluate their tuneable structural features, namely the effect of the anion nature, cation core and cation alkyl side chain length on the phase behavior. Addnl. evidence on the mol.-level mechanisms which rule the phase splitting was obtained by 1H NMR (NMR) spectroscopy and by COSMO-RS (Conductor-like Screening Model for Real Solvents). Some systems, for which the IL-PPG-400 pairs are completely miscible, revealed to be of type “0”. All data collected suggest that the formation of PPG-IL-based ABSs is controlled by the interactions established between the IL and PPG, contrarily to previous reports where a “salting-out” phenomenon exerted by the IL over the polymer in aqueous media was proposed as the dominant effect in ABS formation. The influence of temperature on the liquid-liquid demixing was also evaluated. In general, an increase in temperature favors the formation of an ABS in agreement with the lower critical solution temperature (LCST) phase behavior usually observed in polymer-IL binary mixtures Partition results of a dye (chloroanilic acid, in its neutral form) further confirm the possibility of tailoring the phases’ polarities of IL-PPG-based ABSs. In the experiment, the researchers used many compounds, for example, 1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3Product Details of 125652-55-3).
1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Product Details of 125652-55-3