title: Hexafluoridotechnetate(IV) revisited.
abstract: Novel synthetic routes to hexafluoridotechnetate(IV) are reported, and for the first time the single-crystal X-ray structures of several M2[TcF6] salts (M = Na, K, Rb, Cs, NH4, and NMe4) were determined. The ammonium and the alkaline metal salts crystallize in the trigonal space group P3m, while the NMe4(+) salt belongs to the space group R3. [TcF6](2-) salts are widely stable in aqueous solution. In alkaline media, however, a slow hydrolysis is observed, and the first hydrolysis product, the dimeric, oxido-bridged complex [F5Tc-O-TcF5](4-), could be studied structurally.
authors.affiliation: Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstr. 34/36, D-14195 Berlin, Germany.
authors.forename: Samundeeswari Mariappan
authors.initials: SM
authors.lastname: Balasekaran
authors.forename: Matthias
authors.initials: M
authors.lastname: Molski
authors.forename: Johann
authors.initials: J
authors.lastname: Spandl
authors.forename: Adelheid
authors.initials: A
authors.lastname: Hagenbach
authors.forename: Roger
authors.initials: R
authors.lastname: Alberto
authors.forename: Ulrich
authors.initials: U
authors.lastname: Abram