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The title complex, [Co3(C8H3NO6)2(C2H3O2)2(C10H8N2)2(H2O)2], was synthesized under hydrothermal conditions. The structure features a centrosymmetric complex with three CoII centres, one of which is located on a centre of inversion. The Co centres are coordinated in a distorted octahedral geometry. The bipyridine ligands are bonded to just one Co centre in a chelating mode, whereas the 5-nitroisophthalate and acetate ions are bonded to two different Co atoms. The crystal structure is stabilized by O—H...O hydrogen bonds.

The title complex, [Mn2(C8H3NO6)2(C12H8N2)2]n, was synthesized under hydrothermal conditions. The structure contains two independent MnII atoms, each coordinated in a distorted octahedral MnN2O4 geometry. [Mn2(phen)2] units (phen = 1,10-phenantroline) are bridged by 5-nitroisophthalate (nip) ligands into ladder-like chains parallel to [100]. Adjacent polymeric chains are linked by C—H...O and π–π interactions [centroid-to-centroid distance = 3.6369 (12) Å] into a two-dimensional framework parallel to (010).

In the title compound, {(C4H12N)[Mn(HCO2)3]}n, the MnII atom lies on an inversion centre and is coordinated by O-atom donors from the three double-bridging formate ligands, one of which lies across a crystallographic mirror plane, giving a slightly distorted octahedral coordination sphere. A three-dimensional NaCl-type framework is generated in which the tetramethylammonium cations, which lie across mirror planes and occupy the cavities in the polymer structure, form weak C—H...O hydrogen bonds with the formate ligands.