catena-Poly[[(2,9-dimethyl-1,10-phenanthroline-κN,N')cobalt(II)]-µ-malonato-κO,O:O,O].

In the title compound, [Co(C(3)H(2)O(4))(C(14)H(12)N(2))](n), the Co(II) ion is in a distorted octa-hedral coordination being chelated by a 2,9-dimethyl-1,10-phenanthroline mol-ecule (dmphen) and two carboxyl-ate groups of two malonate ligands The malonate ligand acts in a bridging mode, forming coordination chains along [100]. π-π stacking inter-actions between dmphen ligands [inter-planar distances = 3.414 (4) and 3.447 (4) Å] organize the coordination polymers into supra-molecular double chains.

catena-Poly[4,4'-bipyridinium [[diaqua-disulfatocadmium(II)]-µ-4,4'-bipyridine-κN:N'] dihydrate].

The title compound, {(C(10)H(10)N(2))[Cd(SO(4))(2)(C(10)H(8)N(2))(H(2)O)(2)]·2H(2)O}(n), consists of anionic chains of the Cd complex, diprotonated 4,4'-bipyridinium cations and uncoordinated water mol-ecules. In the anionic chain, the Cd atom lies on a center of inversion in an octa-hedral geometry. The midpoint of the coordinated bipyridine also resides on a center of inversion, as does the non-coordinated bipyridinium counterion. O-H⋯O and N-H⋯O hydrogen bonding inter-actions and π-π stacking inter-actions in the structure are responsible for the supra-molecular assembly.