“…[10,11] In this sense, several studies with different metallo-organic precursors, employing carboxylate ligands such as edta, [12] oxalate [13] and tartrate, [14] or nitrite [15] have been carried out, and more recently using the malonate ligand. [8,16Ϫ18] Malonate complexes such as [AM(C 3 H 2 O 4 ) 2 (H 2 O) 4 ], where A is Sr or Ba and M is Mn or Cu, showed interesting spin octahedral symmetry.…”