Partial molar volumes of tetraalkylammonium hydroxides in aqueous solution at 25°C

Thermodynamics of dilute aqueous solutions of imidazolium based ionic liquids

“…This behaviour is contrary to what is observed for aqueous solutions of alkali halides [58] which are hydrophiles owing to large elctrostriction, and tetra-alcohol ammonium halides [57] which are hydrogen bonding molecules. / V of ILs in aqueous media behaves in a similar fashion as that of aqueous solutions of tetraalkylammonium halides and hydroxides [59,60]. These results indicate that the [C n mim] ILs are structure makers even when the anions such as [Cl] À , [Br] À , or ½BF4 À behave as marginal water structure breakers [31].…”

Part 2: Limiting apparent molar volume of organic and inorganic 1:1 electrolytes in (water+ethylammonium nitrate) mixtures at 298K – Thermodynamic approach using Bahe–Varela pseudo-lattice theory

“…The characters of water structure breakers of Me 4 N + and Et 4 N + ions and of structure promoters for nPr 4 N + and nBu 4 N + ions [44][45][46] have been interpreted as the interpenetration of the hydration spheres of these ions [41,47] or the association, even at very low concentrations, of nPr 4 N + and nBu 4 N + cations [48]. Clathrate-like structure formation has been suggested by Wen et al [42].…”

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“…4 und 5) finden sich die gefalteten DASA-Ionen ober-und unterhalb des makrocyclischen Dikations in der Weise angeordnet, daû die synclinalen Atome O (2) [44], pK b fu È r Me 3 NO: 9,35 [45,46]) lediglich ein (N±H´´´O)-verknu È pftes Neutralmoleku È l-Addukt gebildet wird [47]. 4 und 5) finden sich die gefalteten DASA-Ionen ober-und unterhalb des makrocyclischen Dikations in der Weise angeordnet, daû die synclinalen Atome O (2) [44], pK b fu È r Me 3 NO: 9,35 [45,46]) lediglich ein (N±H´´´O)-verknu È pftes Neutralmoleku È l-Addukt gebildet wird [47].…”

“…43,46); H 4,50 (4,46); N 5,48 (5,63); S 12,47 (12,89)%. Eine Suspension von 0,20 g (0,75 mmol) 13 und 0,56 g (1,5 mmol) 1 c in 20 ml CH 2 Cl 2 wurde 2 h bei 20°C geru È hrt, der Feststoff abfiltriert und aus CH 2 Cl 2 /Petrolether umkristallisiert.…”