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Pd[B(S2O7)2]2 and Pd[B(SO4) (S2O7)]2: Two Borosulfates with Pd2+ in Octahedral and One with Pd2+ in Square Planar
Stefan Sutorius1, David Patrun1, Arthur Edelmann1
1Institut für Anorganische und Materialchemie, Universität zu Köln, Greinstraße 6, 50939, Cologne, Germany.
Abstract:
The reaction of elemental palladium with B2O3 and SO3 at elevated temperature results in the formation of blue crystals of Pd[B(S2O7)2]2. Dependent on the reaction conditions, the compound crystallizes in two different polymorphs obtained as bulk samples. In both structures the Pd2+ cations are coordinated by six oxygen atoms in form of an almost perfect octahedron. All oxygen atoms belong to the borosulfate anions [B(S2O7)2]- and link via Pd2+ cations to an extended network structure. Within the uncommon octahedral oxygen coordination, the Pd2+ cations reveal a d8 high-spin configuration, which leads to paramagnetism. Occasionally, red crystals are formed during the reaction next to the major fraction of blue crystals of Pd[B(S2O7)2]2. Single crystal X-ray structure analysis on the red crystals reveals the sum formula Pd[B(SO4)(S2O7)]2 with Pd2+ in square-planar coordination.
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