Synthesis, structure and magnetic property of cobalt(II) and manganese(II) complexes with mixed organic ligands

Two new metal complexes with mixed nitrogen-donor heterocyclic monocarboxylate and dicarboxylate ligands {[Co2(L)2(BDC)(H2O)]·2H2O·6DMF}n (1) and [Mn(L)(OX)0.5]n (2) (HL = 3,5-di(pyridine-4-yl)benzoic acid, H2BDC = 1,4-benzenedicarboxylic acid, H2OX = oxalic acid) have been prepared and characterized by single crystal and powder X-ray diffractions, IR, and thermogravimetric analyses. Crystallographic and topological analyses identify that both complexes have new framework topologies. Complex 1 is a (3,8)-connected 2-nodal 3D net with a point (Schläfli) symbol of (42.5)2(44.510.67.76.8), while 2 is a (4,5)-connected binodal net with a point (Schläfli) symbol of (42.63.8)(42.65.83). Furthermore, magnetic investigation shows that both complexes exhibit overall weak antiferromagnetic coupling between the adjacent metal centers.