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Four coordination polymers, [M3(boaba)2(4, 4′‐bipy)2(H2O)8] [M = Co (1), Ni (2), Mn (3)] and [Cu3(boaba)2(bimb)3]·4H2O (4) [H3boaba = 3, 5‐bis‐oxyacetate‐benzoic acid, 4, 4′‐bipy = 4, 4′‐bipyridine, bimb = 1, 4‐bis(imidazol‐1′‐yl)butane], were hydrothermally synthesized and characterized by single‐crystal X‐ray diffraction, IR spectroscopy, and TG analyses. Compounds 1–3 are isostructural and crystallize in the triclinic P$\bar{1}$ space group. Their structures can be considered constructed from two‐dimensional layers, which consist of two neighboring 1D ladder chains and are further linked by intermolecular O–H···O hydrogen bonds into a 3D supramolecular network. Compound 4 is a 3D (3, 4, 4)‐connected topology network.

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In the title co-crystal, C10H8N2·C8H7NO4S, the formate group is coplanar with the pyridyl ring of the acid [dihedral angle = 6.2 (7)°], while the carb­oxy­methyl­sulfanyl group makes a C—S—C—C torsion angle of 70.2 (1)° with the pyridine ring. The dihedral angle between the pyridyl rings of the 4,4′-bipyridine mol­ecule is 27.4 (1)°. The acid and the 4,4′-bipyridine mol­ecules are involved in hydrogen bonding via carb­oxy­lic O and pyridyl N atoms. The structure is further consolidated by inter­molecular C—H⋯O hydrogen bonds, generating a three-dimensional network.