Complexes of niobium, tantalum and tungsten pentahalides with fluorinated ditertiary arsines

Abstract

The fluorinated ditertiary arsines 1,2-bis(dimethylarsino)-3,3,4,4-tetrafluorocyclobutene, 1,2-bis(di- methylarsino)-3,3,4,4,5,5-hexafluorocyclopentene, and 1,2-bis(dimethy1arsino)-4-fluorobenzene react with niobium and tantalum pentachlorides and pentabromides, and with tungsten hexachloride, to form MX₅(diarsine). These are the first metal complexes containing fluoro ligands coordinated to metal atoms in such high oxidation states.