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Tantalum(V) fluoride is used as a Friedel-Crafts catalyst. It combines with hydrogen fluoride and acts as a catalyst for the alkylation of alkanes and alkenes as well as the protonation of aromatic compounds.
Levason, W.; Light, M. E.; Reid, G.; Zhang, W. Soft diphosphine and diarsine complexes of niobium(V) and tantalum(V) fluorides: synthesis, properties, structures and comparisons with the corresponding chlorides. Dalton Trans. 2015, 43 (25), 9557-9566.
Song, M. Y.; Kwak, Y. J.; Lee, S. H.; Park, H. R. Hydriding and dehydriding rates of Mg, Mg-10TaF5, and Mg-10NbF5 prepared via reactive mechanical grinding. Met. Mater. Int. 2015, 21 (1), 208-212.
Gefahrenhinweise (EU): H302-H312-H332-H314-H318
Harmful if swallowed. Harmful in contact with skin. Harmful if inhaled. Causes severe skin burns and eye damage. Causes serious eye damage.
Do not breathe dusts or mists. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.