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

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 mu(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. (C) 2012 Elsevier Ltd. All rights reserved.