From chain to layer structure: CdII coordination polymers derived from diphenic acid

Bis(μ-biphenyl-2,2'-dicarboxyl-ato)bis-[(2,2'-bipyridine)cobalt(II)]

In the title compound, [Co₂(C₁₄H₈O₄)₂(C₁₀H₈N₂)₂], the Co^II atom is coordinated by two N atoms from one 2,2′-bipyridine ligand and two O atoms from two biphenyl-2,2′-dicarboxyl­ate (2,2′-dpa) ligands in a distorted planar geometry. Longer Co—O contacts [2.437 (3) and 2.552 (3) Å] are formed to the second O atom of each coordinated carboxyl­ate group so that these groups approximate a bidentate coordination mode and the coordination geometry around Co^II approaches distorted octa­hedral. The 2,2′-dpa ligands bridge two Co^II atoms, forming a cyclic dinuclear complex around a centre of inversion.

catena-Poly[[diaqua-(2,2'-bipyridine-κN,N')nickel(II)]-μ-biphenyl-2,2'-dicarboxyl-ato-κO:O']

In the title compound, [Ni(C(14)H(8)O(4))(C(10)H(8)N(2))(H(2)O)(2)](n), the Ni(II) atom is coordinated in a slightly distorted octa-hedral geometry by two water mol-ecules, two N atoms from a 2,2'-bipyridine ligand and two O atoms from the carboxyl-ate groups of two 2,2'-biphenyl-dicarboxyl-ate (2,2'-dpa) ligands. The 2,2'-dpa ligand acts as a bridge between neighbouring Ni(II) atoms, forming one-dimensional coordination polymers along [100]. The coordinated water mol-ecules form hydrogen bonds to the carboxyl-ate O atoms of 2,2'-dpa within the same coordination polymer, and one O-H⋯π inter-action is also formed to 2,2'-dpa.