Poly[di-μ-aqua-μ-1,2-bis(pyridin-4-yl)ethene-κ²N:N′-tetrakis(4-iodobenzo­ato-κ²O,O′)dicadmium]

Colourless crystals of the title compound, [Cd₂(C₇H₄IO₂)₄(C₁₂H₁₀N₂)(H₂O)₂]_n, were obtained by the self-assembly of Cd(NO₃)₂·4H₂O, 1,2-bis­(pyridin-4-yl)ethene (bpe) and 4-iodo­benzoic acid (4-IBA). Each Cd^II atom is seven-coordinated in a penta­gonal–bipyramidal coordination environment by four carboxyl­ate O atoms from two different 4-IBA ligands, two O atoms from two water mol­ecules and one N atom from a bpe ligand. The Cd^II centres are bridged by the aqua mol­ecules and bpe ligands, which lie across centres of inversion, to give a two-dimensional net. Topologically, taking the Cd^II atoms as nodes and the μ-aqua and μ-bpe ligands as linkers, the two-dimensional structure can be simplified as a (6,3) network.

Poly[[[mu]₂-1,3-bis­(pyridin-4-yl)­propane]([mu]₃-1,4-phenyl­ene­diacetato)­cadmium]

Solvothermal reaction between Cd(NO₃)₂, 1,4-phenyl­ene­diacetate (1,4-PDA) and 1,3-bis­(pyridin-4-yl)­propane (bpp) afforded the title complex, [Cd(C₁₀H₈O₄)(C₁₃H₁₄N₂)]_n. Adjacent carboxylate-bridged Cd^II ions are related by an inversion centre. The 1,4-PDA ligands adopt a cis conformation and connect the Cd^II ions to form a one-dimensional chain extending along the c axis. These chains are in turn linked into a two-dimensional network through bpp bridges. The bpp ligands adopt an anti-gauche conformation. From a topo­logi­cal point of view, each bpp ligand and each pair of 1,4-PDA ligands can be considered as linkers, while the dinuclear Cd^II unit can be regarded as a 6-connecting node. Thus, the structure can be simplified to a two-dimensional 6-connected network.