title: Synthesis of functional phosphates [P(C2F5)3F2X]- from the phosphorane adduct [P(C2F5)3F2(dmap)].
abstract: Weakly coordinating anions (WCAs) are of great academic as well as industrial interest. To advance the fluoroalkyl phosphate anion [P(C2F5)3F3](-), which is ideally suited for technical applications, functional substituents X are attached to the Lewis acid (C2F5)3PF2. In keeping with this, the reaction of (C2F5)3PF2 with 4-(dimethylamino)pyridine (DMAP) yields the corresponding adduct [P(C2F5)3F2(dmap)]. Treatment of this adduct with Brønsted acids (HX) leads to the selective formation of the corresponding phosphate anions [P(C2F5)3F2X](-) by trapping the proton with the liberated base DMAP. In this way, OH functions can be transformed in one step into WCAs, slightly increasing the coordination properties of the corresponding anion. An ion exchange to the corresponding [PPh4] salts results in solids, whereas the corresponding imidazolium salts are obtained as room-temperature ionic liquids.
authors.affiliation: Center for Molecular Materials, Anorganische Chemie II, Universität Bielefeld , Universitätsstraße 25, D-33615 Bielefeld, Germany.
authors.forename: Julia
authors.initials: J
authors.lastname: Bader
authors.forename: Nikolai
authors.initials: N
authors.lastname: Ignat'ev
authors.forename: Berthold
authors.initials: B
authors.lastname: Hoge