Oxidising behaviour of molybdenum and tungsten hexafluorides

Bis[acetonitrilesilver(I)] hexafluorosilicate

“…Silver cations coordinated by acetonitrile and a hexafluoro anion, e.g. [Ag(NCCH 3 ) 2 ][WF 6 ], are described in the literature, but no structural investigation has been carried out so far (Prescott et al 1973(Prescott et al , 1975Iqbal et al, 1989). As part of our present research, the title compound, [Ag(NCCH 3 )] 2 SiF 6 , (I), was obtained unintentionally.…”

Electrochemical studies of molybdenum hexafluoride and related compounds in anhydrous hydrogen fluoride

“…This observation was at variance with the commonly held view to that time that MoF6 and WF6 were both vigorous fluorinating agents and virtually identical in their chemical behavior.9,10 More recently, Prescott and co-workers have reported that in acetonitrile MoF6 will oxidize silver metal to silver(II) while WF6 gives only silver(I) compounds. 11 In their paper they claimed that "definitive evidence" had been lacking for the difference in reactivity between MoF6 and WF6. Certainly, up until now, no quantitative measurement of the difference has been available.…”

Lewis base complexes of tungsten and molybdenum hexafluorides

“…Except for a preliminary communication there has been no study of the equilibria between free tungsten hexafluoride and its complexes of different stoichiometry, nor of the kinetics of these reactions (4). It has been reported that molybdenum hexafluoride is a stronger oxidizing agent than tungsten hexafluoride but there is no data concerning the relative electron accepting ability of the two fluorides in formation of Lewis acidbase complexes (6,7). The present study is an attempt to fill in some of these gaps in our knowledge of the chemistry of these fluorides.…”