Di­aqua­tris­(nicotinato-κO)­bis(1,10-phenanthroline-κ²N,N′)­cerium(III) trihydrate

In the title compound, [Ce(C₆H₄NO₂)₃(C₁₂H₈N₂)₂(H₂O)₂]·3H₂O, the Ce^III atom shows a capped trigonal prismatic N₄O₅ coordination. The Ce—O and Ce—N bond distances are 2.390 (2)–2.517 (2) and 2.730 (3)–2.752 (3) Å, respectively.

Polymeric diaqua­bis(μ₄-benzene-1,2,4-tricarboxyl­ato)bis(2,2′-bipyridine)tricadmium(II)

The benzene-1,2,4-tricarboxyl­ate trianion in the polymeric title compound, [Cd₃(C₉H₃O₆)₂(C₁₀H₈N₂)₂(H₂O)₂]_n, uses the carboxyl­ate groups in the 1,2-positions to chelate to a bipyridine-chelated Cd atom, which is simultaneously chelated by the 4-CO₂ group of an adjacent trianion. The O atoms of the 1,2-CO₂ groups that are not involved in chelation to the first Cd atom are each bonded to water-coordinated Cd atoms that lie on centres of inversion. The trianion links the Cd atoms to form a three-dimensional network structure, which is further consolidated by hydrogen bonds involving the water molecules.

catena-Poly­[bis­[aqua(1,10-phenanthroline)­zinc(II)]-μ₄-benzene-1,2,4,5-tetracarboxyl­ato]

The pyromellitate tetraanion in the title polymeric complex, [Zn₂(C₁₀H₂O₈)(C₁₂H₈N₂)₂(H₂O)₂]_n, uses only one O atom from each carboxyl­ate group to bind to one Zn atom, which is also chelated by the heterocycle; the fifth coordination site of the trigonal bipyramid around the Zn atom is occupied by a water mol­ecule. The ribbons are linked by hydrogen bonds into sheets. The pyromellitate tetranion lies on an inversion center.