Bis(2,9-dimethyl-1,10-phenanthrolin-1-ium) 2,5-di­carb­oxy­benzene-1,4-di­carb­oxyl­ate–2,9-dimethyl-1,10-phenanthroline–benzene-1,2,4,5-tetra­carb­oxy­lic acid (1/2/1)

The asymmetric unit of the title co-crystal, 2C₁₄H₁₃N₂⁺·C₁₀H₄O₈²⁻·2C₁₄H₁₂N₂·C₁₀H₆O₈, comprises a 2,9-dimethyl-1,10-phenanthrolin-1-ium cation (Me₂PhenH⁺) and a 2,9-dimethyl-1,10-phenanthroline mol­ecule (Me₂Phen), each in a general position, and half each of a 2,5-di­carb­oxy­benzene-1,4-di­carboxyl­ate dianion (LH₂²⁻) and a benzene-1,2,4,5-tetra­carb­oxy­lic acid mol­ecule (LH₄), each being disposed about a centre of inversion. Small twists are evident in the dianion [the C—C—C—O torsion angles are 168.41 (18) and 16.2 (3)°], whereas a major twist is found for one carb­oxy­lic acid group in the neutral mol­ecule [C—C—C—O = 66.3 (2) and 18.2 (3)°]. The most prominent feature of the crystal packing is the formation of linear supra­molecular chains along [001] mediated by charge-assisted O—H...O⁻ hydrogen bonding between alternating LH₄ and LH₂²⁻. These are connected to the Me₂PhenH⁺ and Me₂Phen species by N—H...O and O—H...N hydrogen bonds, respectively. A three-dimensional architecture is formed by C—H...O and π–π inter­actions [inter-centroid distance = 3.5337 (17) Å].

4-Amino-N-(4,6-di­methyl­pyrimidin-2-yl)benzene­sulfonamide–1,4-di­aza­bicyclo­[2.2.2]octane (2/1)

The asymmetric unit of the title co-crystal, C₁₂H₁₄N₄O₂S·0.5C₆H₁₂N₂, comprises the sulfonamide mol­ecule and half a mol­ecule of 1,4-di­aza­bicyclo­[2.2.2]octane (DABCO), the latter being disposed about a crystallographic twofold rotation axis. In the sulfonamide mol­ecule, the aromatic rings are almost perpendicular to one another [dihedral angle = 75.01 (8)°]. In the crystal, mol­ecules are connected into a three-mol­ecule aggregate via amide–DABCO N—H...N hydrogen bonds, and these are connected into a three-dimensional architecture via amino–DABCO N—H...O and amino-pyrimidine N—H...N hydrogen bonds.