Abstract
Thermal studies have shown that metal(II) hexafluoro-arsenates of the types MF 2·2AsF 5 ( M = Mg, Ca, Sr, Mn, Co, Ni, Cd, Hg, Pb), 2MF 2·3AsF 5 (M = Fe, Cu, Zn) and MF 2·AsF 5 (M = Ag, Sn), prepared by the reaction of metal difluorides with AsF 5 in anhydrous HF at room temperature, decompose when heated in an argon atmosphere. In all cases AsF 5 is given off. For some of the adducts the decompositions proceed in one or more steps to give the original difluorides, but for others, the decompositions overlap one another. The greatest range of intermediate stoicheiometries results from the decompositions of the MF 2·2AsF 5 type adducts in which the metal difluoride content is a minimum. In decompositions of adducts of this type as many as three different intermediates, 2MF 2·3AsF 5, MF 2·AsF 5 and 2MF 2·AsF 5, may be observed.
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