Crystal structure and thermal properties of bis[mu-2-(methoxycarbonylhydrazinylidene)acetato-kappa N-3(1),O:O]bis[diaqua(thiocyanato-kappa N)manganese(II)] tetrahydrate

The title compound, [Mn-2(C4H5N2O4)(2)(NCS)(2)(H2O)(4)]center dot 4H(2)O (I), exists as a centrosymmetric dimer. Each dimeric unit consists of tridentate (O,O,N)-chelating Schiff bases with symmetry-maintained mu-O-bridged carboxylate anions, terminally bound thiocyanate anions, and ligated and solvated water molecules. The complex exhibits a distorted octahedron geometry and the centrosymmetric mu-O-bridged carboxylate anions connect the two manganese atoms to form an M2O2 ring. In the crystal, the molecules are interlinked via strong N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen-bonding contacts and weak O-H center dot center dot center dot S intermolecular interactions, forming a three-dimensional molecular network.