Pd Oxyfluoride with a High Oxidation State in Square Planar Coordination

Abstract

Novel oxyfluoride Bi₂PdO₄F_0.5 was synthesized by anion intercalation. XRD pattern of the product could be indexed using the same space group (P4/ncc) as Bi₂PdO₄. Although Bi₂PdO₄ shows no magnetic moment, Curie-Weiss behavior was observed in fluorinated samples. The observed spin is probably derived from Pd ions. Palladium in an oxidation state between two and four tends to disproportionate into Pd²⁺ and Pd⁴⁺. Since Pd²⁺ and Pd⁴⁺ do not have spin, the observed spin moment in Bi₂PdO₄F_0.5 means that the Pd ions are in a higher valence state, without such disproponation.