Synthesis, Properties, and Application of Tetrakis(pentafluoroethyl)gallate, [Ga(C F ) ].

Weakly coordinating anions (WCAs) are important for academic reasons as well as for technical applications. Tetrakis(pentafluoroethyl)gallate, [Ga(C F ) ] , a new WCA, is accessible by treatment of [GaCl (dmap)] (dmap=4-dimethylaminopyridine) with LiC F . The anion [Ga(C F ) ] proved to be reluctant towards deterioration by aqueous hydrochloric acid or lithium hydroxide. Various salts of [Ga(C F ) ] were synthesized with cations such as [PPh ] , [CPh ] , [(O H ) (OH ) ] , and [Li(dec) ] (dec=diethyl carbonate). Thermolysis of [(O H ) (OH ) ][Ga(C F ) ] gives rise to a dihydrate of tris(pentafluoroethyl)gallane, [Ga(C F ) (OH ) ]. 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) ][Ga(C F ) ] as a conducting salt in lithium-ion batteries is presented.