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Angew Chem Int Ed Engl. 2019 Jun 24;58(26):8938-8942. doi: 10.1002/anie.201904197. Epub 2019 May 24.

Synthesis, Properties, and Application of Tetrakis(pentafluoroethyl)gallate, [Ga(C2 F5 )4 ].

Author information

1
Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.

Abstract

Weakly coordinating anions (WCAs) are important for academic reasons as well as for technical applications. Tetrakis(pentafluoroethyl)gallate, [Ga(C2 F5 )4 ]- , a new WCA, is accessible by treatment of [GaCl3 (dmap)] (dmap=4-dimethylaminopyridine) with LiC2 F5 . The anion [Ga(C2 F5 )4 ]- proved to be reluctant towards deterioration by aqueous hydrochloric acid or lithium hydroxide. Various salts of [Ga(C2 F5 )4 ]- were synthesized with cations such as [PPh4 ]+ , [CPh3 ]+ , [(O2 H5 )2 (OH2 )2 ]2+ , and [Li(dec)2 ]+ (dec=diethyl carbonate). Thermolysis of [(O2 H5 )2 (OH2 )2 ][Ga(C2 F5 )4 ]2 gives rise to a dihydrate of tris(pentafluoroethyl)gallane, [Ga(C2 F5 )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(C2 F5 )4 ] as a conducting salt in lithium-ion batteries is presented.

KEYWORDS:

fluorine; gallium; lithium-ion batteries; perfluoroalkyl; weakly coordinating anions

PMID:
30990930
DOI:
10.1002/anie.201904197

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