A polymeric copper(II) complex bridged by benzene-1,3,5-tricarboxyl­ate

The asymmetric unit of the title polymer, poly[copper(II)-μ₆-benzene-1,3,5-tricarboxyl­ato-tri-μ₃-hydroxo], [Cu₃(C₉H₃O₆)(OH)₃]_n, contains two independent Cu^II atoms, one located in a general position assuming a pyramidal coordination geometry, and the other located on an inversion center assuming a square-planar geometry. The benzene­tricarboxyl­ate and hydroxo groups bridge the Cu^II atoms to form a three-dimensional polymeric structure.

Poly[piperazinium(2+) [hexa­aqua­bis(μ₃-benzene-1,3,5-tricarboxyl­ato)dinickel(II)] dihydrate]

The title polymer, {(C₄H₁₂N₂)[Ni₂(C₉H₃O₆)₂(H₂O)₆]·2H₂O}_n, contains two independent Ni^II atoms, both of which are located on inversion centers. The benzene-1,3,5-tricarboxyl­ate mol­ecule bridges the Ni^II atoms in two coordination modes to form a one-dimensional polymeric structure. In the micropore formed by packing of the zigzag chains, there are one piperazinium(2+) cation and two water mol­ecules.

Bis(3,5-dicarboxy­benzoato-κ²O,O′)(1,10-phenanthroline)cobalt(II)

The title mol­ecule, [Co(C₉H₅O₆)₂(C₁₂H₈N₂)] or [Co(H₂BTC)₂(phen)] (BTC = benzene-1,3,5-tricarboxyl­ate and phen = 1,10-phenanthroline), has crystallographic twofold symmetry. The Co^II atom has a coordination geometry that is inter­mediate between octa­hedral and trigonal prismatic. In the crystal structure, mol­ecules are connected via O—H...O hydrogen bonds [O...O = 2.621 (4)–2.684 (4) Å] to form a three-dimensional network.

Poly[μ₂-4,4′-bipyridine-di-μ₂-imidazolidocadmium(II)]

The title compound, [Cd(C₁₀H₈N₂)(C₃H₄N₂)₂]_n, is a new neutral centrosymmetric three-dimensional metal–organic framework structure. The metal atoms occupy inversion centres and the bipyridine ligands also possess C_i symmetry. The metal atoms are bridged by four imidazole ligands and two bipyridine units.