Fig. 1: Molecular geometries.

Ball-and-stick representation of a CoPd₁₂P₈ or FePd₁₂P₈, b FePd₁₂(PhAs)₈ and c PdPd₁₂As₈. The 12 square-planar PdO₄ groups in the shell are highlighted as transparent red planes. The central ions (i.e. Co²⁺ or Fe³⁺ in a, Fe³⁺ in b, and Pd²⁺ in c, respectively) are sketched in orange, oxygen in blue, P or As in dark grey, C in light grey, and H (phenyl groups) in white.