Two new coordination polymers involving Mn(II), Co(II), dicyanamide anion and the nitrogen ligand 5,5′-dimethyl-2,2′-dipyridine: Crystal structures and magnetic properties

摘要

Two new compounds [Mn(dca)2(dmdpy)] (1) and [Co(dca) 2(dmdpy)] (2) (dca = dicyanamide and dmdpy = 5,5′-dimethyl-2, 2′-dipyridine) were synthesized and characterized by single crystal X-ray diffraction, FTIR, thermal analysis and magnetic measurements. In both compounds, the dmdpy ligand adopts a bidentate chelating coordination mode while dca anions act as bidentate μ_(1,5) bridging ligand and the metal centers are involved in a distorted octahedral geometry. In compounds 1 and 2, dca ligands connect the metal sites giving rise to 1D and 2D coordination polymers, respectively. Weak antiferromagnetic interactions were observed between the metal centers in both compounds.