CRYSTAL-STRUCTURE OF CATENA - POLY TRAAQUA(2,2'-BIPYRIDINE-3,3'-DICARBOXYLATO)MN(II)]

The title compound [Mn(BPDC)(H2O)(4)](n) (BPDC = C12H6N2O42-, the dian ion of 2,2'-bipyridine-3,3'-dicarboxylic acid), C12H14N2O8Mn, has been prepared and its crystal structure determined by single crystal X-ray diffraction at room temperature. The cell parameters are a = 13.951(2 ) Angstrom, b = 6.374(1) Angstrom, c = 8.408(1) Angstrom, orthorhombic , P2(1)2(1)2. The six coordinated Mn(II) complex adopts a distorted oc tahedron. The Mn atoms are located on the two fold axis and connected by carboxylate ions to form polymeric chains along the b-axis. The car boxylate acts as monodentate, and bipyridine does not coordinate to Mn . Zn the coordination polyhedron, the Mn...O distances are in the rang e 2.207(3) Angstrom to 2.215(3) Angstrom. The two pyridine rings are n ot coplanar [tau = 63.8 degrees]. The water molecules are involved in three-dimensional hydrogen bond network.