Heterobinuclear complexes as tectons in designing coordination polymers

Four new 1D coordination polymers have been constructed from [(LCuMII)-M-II] nodes connected by various spacers-the dianion of pyrazole-3,5-dicarboxylic acid (pzdc(2-)), the trianion of trimesic acid (trim(3-)), the tetracyanonickelate(II) anion ([Ni(CN)(4)](2-)), and the dicyanamide anion (dca(-)) [M-II = Mn-II, Co-II, and L2- is the dianion of the Schiff-base resulting from the 2:1 condensation of 3-methoxysalicylaldehyde with 1,3-propanediamine, L2- = N,N'-propylene-bis-(3-methoxysalycilideneiminato)]: [LCuMn(pzdc)(CH3OH)(H2O)]center dot H2O (1), [LCuMn(trim)(2/3)(CH(3)oH)(2/3)(H2O)(1/3)]center dot 0.66(H2O)center dot 0.66(CH3OH) (2), [LCuCo(dca)(2)] (3), and [LCu(CH3OH)(H2O)Mn(NC)(2)Ni(CN)(2)]center dot(H2O)(CH3CN) (4). The fifth compound, [{CuL}K{LCu} {Ag(CN)(2)}] (5), was obtained by reacting [CuL] with K[Ag(CN)(2)]. The magnetic investigation of compounds 1, 2, and 4 reveals antiferromagnetic Cu-II-Mn-II intranode interactions (1, J = -48.9 cm(-1); 2, J = -64.7 cm(-1); and 4, J = -60.4 cm(-1); H = -JS(Mn)S(Cu)), as well as weak internodes antiferromagnetic interactions (for compounds 1 and 4). In the case of 2, a weak ferromagnetic internode interaction occurs through the spin polarization mechanism.