Abstract
The two-dimensional (2D) lamellar coordination polymer [Mn(pzc)2]n (pzc = pyrazinecarboxylate) was prepared and its structure determined by X-ray diffraction. Each MnII ion lies in a distorted octahedron coordination sphere, and the pzc ligand adopts two types of bridging mode. As a result, there are two different distances between adjacent MnII atoms: one being 3.50(6) A viaμ2-O forming a dimer of MnII, and the other 5.65(4) A through the syn–anti carboxy oxygen atoms. The latter links the dimer to form an extended 2D lamellar structure. All MnII ions in each layer are nearly coplanar. The adjacent sheets are significantly associated via hydrogen bonding and the shortest interlayer Mn·Mn separation is 9.4 A. The e.s.r. spectrum shows a broad isotropic band centered at g = 2.019. Temperature-dependent magnetic susceptibility measurements (2.0–300 K) reveal the presence of an antiferromagnetic interaction in the coordination polymer.
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