A heterometallic complex, Na2[CoII2CoIII2(IDC3−)4(bipy)4] ·12H2O (bipy = 2,2′-bipyridine), in which mixed-valence tetranuclear squares with imidazoledicarboxylate (IDC3−) linkers are tethered into a unique chain through disodium units, is hydrothermally synthesized and structurally and magnetically characterized.
