4-(2-Carboxy­benzo­yl)benzoic acid–4,4′-bipyridine (1/1)

In the heteromolecular title compound, C15H10O5·C10H8N2, the two components are linked by O—H⋯N hydrogen bonds to form four-component ring supra­molecular assemblies. These are further inter­connected with neighbouring mol­ecules by weak inter­molecular C—H⋯π inter­actions and C—H⋯O hydrogen bonds to generate a three-dimensional network

4,4′-Imino­dipyridinium bis­(hydrogen phthalate)

In the title salt, C10H11N3 2+·2C8H5O4 −, doubly protonated 4,4′-dipyridylamine (dpa) cations participate in N—H⋯O hydrogen bonding with two hydrogen phthalate anions to form a neutral unit. Both anions contain an intramolecular O—H⋯O hydrogen bond. In the crystal structure, these units form two-dimensional layers through π–π stacking inter­actions with a centroid-to-centroid distance of 3.763 (3) Å. In turn, these layers aggregate in three dimensions by additional N—H⋯O hydrogen bonding. The assignment to the noncentrosymmetric space group P1 is corroborated by chemically unreasonable aromatic ring bond distances and poor K scale factor distributions for a disordered model in the centrosymmetric P space group

4,4′-Bipyridine–trans,trans-hexa-2,4-dienedioic acid (1/1)

The title cocrystal, C10H8N2·C6H6O4, crystallizes with half-mol­ecules of 4,4′-bipyridine and trans,trans-hexa-2,4-dienedioic acid in the asymmetric unit, as each is located about a crystallographic inversion center. The bipyridine molecule is planar from symmetry. In the dicarboxylic acid molecule, the O—C—C—C torsion angle is −13.0 (2)°. In the crystal, O—H⋯N and C—H⋯O hydrogen bonds generate a three-dimensional network

Di-4-pyridyl sulfide–isophthalic acid (1/1)

In the heteromolecular title structure, C10H8N2S·C8H6O4, the two components are linked by O—H⋯N hydrogen bonds to form a one-dimensional chain. These chains are further inter­connected by weak inter­molecular C—H⋯O hydrogen bonds and weak C—H⋯π inter­actions to generate a three-dimensional supra­molecular structure

5-Fluoro­isophthalic acid

In the crystal structure of the title compound, C8H5FO4, the complete molecule is generated by crystallographic twofold symmetry with two C atoms and the F atom lying on the axis. The mol­ecule is almost planar with the carboxyl group twisted with respect to the mean plane of the benzene ring by a dihedral angle of 2.01 (1)°. In the crystal, inter­molecular O—H⋯O hydrogen bonds and C—H⋯F inter­actions connect the mol­ecules into a two-dimensional supra­molecular array

Bis(2-hy­droxy­ethanaminium) biphenyl-4,4′-dicarboxyl­ate

In the title compound, 2C2H8NO+·C14H8O4 2−, the dihedral angle between the benzene rings of the dianion is 9.95 (12)°. In the crystal, the cations and anions are linked via inter­molecular O—H⋯O and N—H⋯O hydrogen bonds, generating layers lying parallel to (001)

rac-cis-Cyclo­hexane-1,2-dicarb­oxy­lic acid–isoquinoline (1/1)

In the crystal structure of the title mol­ecular adduct, C9H7N·C8H12O4, the two species are ­linked through a carb­oxy­lic acid–isoquinoline O—H⋯N hydrogen bond. These mol­ecular pairs then inter-associate through the second acid group of the cis-cyclo­hexane-1,2-dicarb­oxy­lic acid molecules, forming a classic centrosymmetric cyclic head-to-head carb­oxy­lic acid–carboxyl O—H⋯O hydrogen-bonding association [graph-set R 2 2(8)], giving a zero-dimensional (cluster) structure, consisting of two of each species

Cyclo­hexa-2,5-diene-1,4-dione–1,2,4,5-tetra­fluoro-3,6-diiodo­benzene (1/1)

The asymmetric unit of the title co-crystal adduct, C6H4O2·C6F4I2, comprises a half-mol­ecule each of cyclo­hexa-2,5-diene-1,4-dione and 1,2,4,5-tetra­fluoro-3,6-diiodo­benzene. The C6F4I2 mol­ecule is almost planar (r.m.s. deviation = 0.0062 Å). In the crystal, the components are connected through O⋯I halogen bonds [3.017 (11) Å], leading to the formation of wavelike chains along the a axis. The crystal packing also features C—H⋯F inter­actions

Benzene-1,3,5-tricarb­oxy­lic acid–5-(4-pyrid­yl)pyrimidine (1/1)

In the pyrimidine mol­ecule of the title compound, C9H7N3·C9H6O6, the pyridine ring is oriented at 33.26 (11)° with respect to the pyrimidine ring. In the benzene-1,3,5-tricarb­oxy­lic acid mol­ecule, the three carb­oxy groups are twisted by 7.92 (9), 8.68 (10) and 17.07 (10)° relative to the benzene ring. Classical O—H⋯N and O—H⋯O hydrogen bonds and weak C—H⋯O and C—H⋯N hydrogen bonds occur in the crystal structure

catena-Poly[[bis­(nitrato-κ2 O,O′)copper(II)]-μ-2,2′-(ethane-1,2-diyldithio)di-1,3,4-thia­diazole-κ2 N 4:N 4′]

In the title compound, [Cu(NO3)2(C6H6N4S4)]n, the CuII atom, occupying a crystallographic inversion centre, is six-coordinated by two N atoms of two 2,2′-[1,2-ethane­diyl­bis­(thio)]bis­[1,3,4-thia­diazole] ligands in trans positions, and four O atoms from two symmetry-related opposite nitrate anions, which are asymmetrically bonded, resulting in a strong distorted octa­hedral geometry of the central atom. The ethane group is equally disordered over two sites via another inversion centre. The bridging bidentate 2,2′-[1,2-ethanediylbis(thio)]bis­[1,3,4-thia­diazole] ligands link the CuII centres into a one-dimensional chain. The chains are inter­connected via inter­molecular S⋯O inter­actions [3.044 (4) and 3.084 (5) Å] and weak C—H⋯O hydrogen bonds, generating a three-dimensional supra­molecular structure