Construction and magnetic properties of cobalt(II) and manganese(II) coordination polymers based on N-heterocyclic carboxylate bifunctional ligands

Four novel coordination polymers, namely, [Co(L1)Cl(H2O)]n (1), [Mn(L1)Cl(H2O)]n·nH2O (2), [Co3(L2)2(H2O)2]n·nCH3CN·nH2O (3), [Mn3(L2)2(H2O)12]n·1.5nH2O (4) were solvothermally constructed by two N-heterocyclic carboxylate bifunctional ligands, 1-(4-carboxylphenyl)-3-(prazin-2-yl)-1H-1,2,4-triazole (HL1) and 5-(2,3-dicarboxylphenoxy)nicotic acid (H3L2). Compounds 1, 2 and 4 exhibit 1D loop chain, and 3 displays a 2D framework based on the [Co3(COO)4] SBUs with a (4,8)-connected new topology with the point symbol of (418·610)(45·6)2. Magnetic studies show that compounds 1, 3 and 4 exhibit antiferromagnetic behavior.