2+ and one σ, two π and one δ path in [Fe 2 (µ-O)(NH 3 ) 10 ] 2+ . The usage of ammonia ligands to complete the coordination spheres is motivated by their simplicity, minimal steric hindrance and considers common structural motifs for the respective transition metals. As noted previously, this choice reduces potential biases toward specific geometries and electronic structures that might arise with bulkier or more complex ligands.