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

•Two new metal–organic frameworks with mixed ligands have been obtained.•The complexes have new network topologies.•The magnetic properties have been investigated.

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.

Graphical abstractNew Co(II) and Mn(II) coordination frameworks {[Co2(L)2(BDC)(H2O)]·2H2O·6DMF}n (1) and [Mn(L)(OX)0.5]n (2) have been prepared by reactions of ligands of 3,5-di(pyridine-4-yl)benzoic acid (HL), 1,4-benzenedicarboxylic acid (H2BDC) and oxalic acid (H2OX) with corresponding metal salt and characterized.Figure optionsDownload full-size imageDownload as PowerPoint slide