A linear heterometallic bismuth-copper coordination polymer containing two types of organic ligands

In the linear coordination polymer catena-poly[[[aqua(1,10-phenanthroline-kappa N-2,N')copper(II)]-mu-pyridine-2,6-di-carboxylato-kappa O-4(2):O-2',N,O-6-[(nitrato-kappa O-2,O')bismuth(III)]-mu-pyridine-2,6-dicarboxylato-kappa O-4(2),N,O-6:O6'] dihydrate], {[(BiIII-CuII)(C7H3NO4)(2)(NO3)(C12H8N2)(H2O)]center dot 2H(2)O}(n), the Bi-III cation is O,N,O'-chelated by the two pyridine-2,6-dicarboxylate ligands and O,O'-chelated by the nitrate anion, the nine coordinating atoms conferring a tricapped trigonal prismatic environment on the metal centre. Each pyridine-2,6-dicarboxylate ligand uses one of its carboxylate O atoms to bind to an aqua(1,10-phenanthroline) copper(II) unit, the Cu-O dative bonds giving rise to the formation of a ribbon motif. The Cu II cation exhibits a square-pyramidal geometry. The ribbon motif propagates along the shortest axis of the triclinic unit cell and the solvent water molecules are hydrogen bonded to the same ribbon.