Synthesis of tetrafluoronickelate(II) and tetrafluorozincate(II) complexes from aqueous media: a novel route to fluorometalates

The complexes A2[NiF4](A = NH4+, K+, or Rb+) and A2[ZnF4](A = NH4+, K+, Rb+, or Cs+) have been synthesised, from the corresponding metal acetylacetonates (acac) with 40% HF and AF, in very high yields. The new method also allows the preparation of [VOF5]2–, [MnF5]2–, and [CrF5(H2O)]2– from [VO(acac)2], [Mn(acac)3], and [Cr(acac)3] respectively.