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

Heterobinuclear [Cu(II)Mn(II)] and [Cu(II)Co(II)] cationic complexes can efficiently act as nodes for designing coordination polymers. The crystal structures of two binuclear precursors, [LCuCo(NO(3))(2)] (1) and [LCuMn(NO(3))(2)] (2), have been solved (L(2-) 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(H(2)O)CuCo(oxy-bbz)]center dot CH(3)CN center dot C(2)H(5)OH (3), (1) (infinity)[L(H(2)O)CuCo(2,5-dhtp)]center dot CH(3)CN (5) and (infinity)[L(H(2)O)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)(H(2)O)(2)] (4).