A Cubic 3d–4f Structure with Only Ferromagnetic Gd–Mn Interactions

All aligned: A cubic 3d5–4f7 network of Mn2+ and Gd3+ ions is assembled by oxydiacetate (O(CH2CO2−)2). The network, which is reminiscent of Prussian blue analogues (see picture; Gd coordination polyhedra: purple, Mn coordination polyhedra: blue, [Mn(H2O)6]2+: green, H2O: red), has a weak but definite ferromagnetic interaction.