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The title compound [Mn(BPDC)(H 2 O) 4 ]  n   (BPDC = C 12 H 6 N 2 O 4  2− , the dianion of 2,2′-bipyridine-3,3′-dicarboxylic acid), C 12 H 14 N 2 O 8 Mn, 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) Å,  b  = 6.374(1) Å,  c  = 8.408(1) Å, orthorhombic,  P 2 1 2 1 2. The six coordinated Mn(II) complex adopts a distorted octahedron. The Mn atoms are located on the two fold axis and connected by carboxylate ions to form polymeric chains along the  b -axis. The carboxylate acts as monodentate, and bipyridine does not coordinate to Mn. In the coordination polyhedron, the Mn…O distances are in the range 2.207(3) Å to 2.215(3) Å. The two pyridine rings are not coplanar [ τ  = 63.8°]. The water molecules are involved in three-dimensional hydrogen bond network.

Crystal structure of catena – poly [tetraaqua(2,2′-bipyridine-3,3′-dicarboxylato)Mn(II)]