title: The dissolution of polyols in salt solutions and ionic liquids at molecular level: ions, counter ions, and hofmeister effects.
abstract: The dissolving process of polyols in salt solutions (TBAF, TBAC, TBAB, TBAI, TMAF) and imidazolium-based ionic liquids ([C2 mim][OAc], [C2 mim][Et2 PO4 ], [C2 mim][EtSO4 ], [C2 mim][SCN]) is exemplarily studied by IR spectroscopy. Vibrational bands and their shifts in the OH stretch region reveal crucial information for the dissolved polyol interacting with the anions of the salt solutions and ionic liquids. The well-chosen set of ionic solutions confirms the linear relation between the OH-stretch frequencies and the solubility capacity of the salt solutions. Likewise, it also provides an explanation of the dissolving process at molecular level. Notably, the solubility capacities of the anions in the salt solutions follow the well-known Hofmeister series. This phenomenon can be understood on the basis of the disruption power of the anions and the specific size ratio of the anion/cation combinations.
authors.affiliation: Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr. Lorenz Weg 1, 18059, Rostock (Germany), Fax: (+49) 381-498-6517.
authors.forename: Zakar
authors.initials: Z
authors.lastname: Papanyan
authors.forename: Christian
authors.initials: C
authors.lastname: Roth
authors.forename: Kai
authors.initials: K
authors.lastname: Wittler
authors.forename: Sebastian
authors.initials: S
authors.lastname: Reimann
authors.forename: Ralf
authors.initials: R
authors.lastname: Ludwig
mesh_terms: D002482:Cellulose / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D007477:Ions; D008958:Models, Molecular; D011108:Polymers / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D012995:Solubility
chemical_list: D052578:Ionic Liquids; D007477:Ions; D011108:Polymers; D012492:Salts; C024617:polyol; D002482:Cellulose
keywords: ATR spectroscopy; cellulose; density functional calculations; ionic liquids; solubility