New heterometallic coordination polymers constructed from 3d-3d′ binuclear nodes

Heterobinuclear [(CuMnII)-Mn-II] and [(CuCoII)-Co-II] cationic complexes can efficiently act as nodes for designing coordination polymers. The crystal structures of two binuclear precursors, [LCuCo(NO3)(2)] (1) and [LCuMn(NO3)(2)] (2), have been solved (L2- is the dianion of the Schiff base resulting from the 2 : 1 condensation of 3-methoxysalicyladehyde with 1,3-propanediamine). The nitrato ligands, coordinated to Co-II and, respectively, the Mn-II ions from the precursors, are easily replaced by exo-dentate ligands, resulting in 1-D coordination polymers: (1) (infinity)[L(H2O)CuCo(oxy-bbz)]center dot CH3CN center dot C2H5OH (3), (1) (infinity)[L(H2O)CuCo(2,5-dhtp)]center dot CH3CN (5) and (infinity)[L(H2O)CuMn(ox)]center dot 3H(2)O (6) (oxy-bbz(2-) - the dianion of 4,4'-oxy-bis(benzoic) acid; 2,5-dhtp(2-) = the dianion of 2,5-dihydroxy-terephthalic acid; ox(2-) = the dianion of the oxalic acid). In the case of the [CuMn] node, the interaction with oxy-bbz(2-) affords a binuclear complex, [LCuMn(oxy-bbz)(H2O)(2)] (4).