Abstract
A new variety of palladium difluoride has been prepared via a low temperature (LT) process in anhydrous hydrogen fluoride (aHF). Reaction between solutions of Pd(AsF 6) 2 and CsF in aHF results in the precipitation of the light-brown LT form of PdF 2. This phase crystallises in the Pa3 cubic space group with a=532.4(1) pm and can be derived from the fluorite structure. The co-ordination of Pd is: 6F at 217.6(3) pm+2F at 316.8(3) pm. The structural network can be described either as PdF 8 rhombohedra sharing edges — as MX 8 cubes in the fluorite — or as flattened PdF 6 octahedra sharing corners. Each F atom is common to 3 octahedra. The relationships with the fluorite and pyrite structures have been raised. LT-PdF 2 is antiferromagnetic, with a Néel temperature evaluated at around 180 K.
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