hexafluorotechnetates. TcF6 disproportionates on hydrolysis with aqueous NaOH to form a black precipitate of TcO2. In hydrogen fluoride solution, TcF6 reacts with hydrazinium fluoride to yield N2H6TcF6 or N2H6(TcF6)2. References Technetium compounds Hexafluorides Octahedral compounds