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The oxidation of SnF, in HF with O,, F,, or SO, yields insoluble Sn3F8; the crystal structure of this new compound shows trans-fluorine-bridged SnIVF, units linked to polymeric Sn*F chains. TIN(II) fluoride is readily soluble in anhydrous HF a t 20O.1 Such solutions were found to react smoothly with F, [P(F,)

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The anions in the title, n = 1-6, have been conclusively characterised in solution by '9F, 75As, and 121Sb n.m.r. spectroscopy and, for n = 1-5, shown to be stable with respect to fluorine redistribution reactions.Several salts containing halogenofluoroanions of group 5 elements have been isolated; thus SbX2F4', X = C11 or Br,2 and SbX4F2-, X T C1,3 have been prepared and assigned cis octahedral structures on the basis of vibrational spectroscopy. Furthermore Kolditz and Krause4 claim to have obtained tetra-alkylammonium salts of SbCIFS-, AsC1F5-, AsC12F4-,

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