PUB - Publikationen an der Universität Bielefeld

Weakly coordinating anions (WCA) are important for academic reasons as well as for technical applications. Tetrakis(pentafluoroethyl)gallate, [Ga(C2F5)4]-, a new WCA, is accessible by treatment of [GaCl3(dmap)] (dmap = 4-dimethylaminopyridine) with LiC2F5. The anion [Ga(C2F5)4]- proved to be reluctant towards deterioration by aqueous hydrochloric acid or lithium hydroxide. Various salts of [Ga(C2F5)4]- were synthesized with cations such as [PPh4]+, [CPh3]+, [(O2H5)2(OH2)2]2+ and [Li(dec)2]+ (dec = diethyl carbonate). Thermolysis of [(O2H5)2(OH2)2][Ga(C2F5)4]2 gives rise to a dihydrate of tris(pentafluoroethyl)gallane, [Ga(C2F5)3(OH2)2]. All products were characterized by NMR and IR spectroscopy, mass spectrometry, X-ray diffraction and elemental analysis. Furthermore an outlook for the application of [Li(dec)2][Ga(C2F5)4] as a conducting salt in lithium-ion batteries is presented. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.