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The two centrosymmetric dinuclear copper paddle-wheel complexes tetrakis(μ-4-hydroxybenzoato-κ(2)O:O')bis[aquacopper(II)] dimethylformamide disolvate dihydrate, [Cu2(C7H5O3)4(H2O)2]·2C3H7NO·2H2O, (I), and tetrakis(μ-4-methoxybenzoato-κ(2)O:O')bis[(dimethylformamide-κO)copper(II)], [Cu2(C8H7O3)4(C3H7NO)2], (II), crystallize with half of the dinuclear paddle-wheel cage unit in the asymmetric unit and, in addition, complex (I) has one dimethylformamide (DMF) and one water solvent molecule in the asymmetric unit. In both (I) and (II), two Cu(II) ions are bridged by four syn,syn-η(1):η(1):μ carboxylate groups, showing a paddle-wheel cage-type structure with a square-pyramidal coordination geometry. The equatorial positions of (I) and (II) are occupied by the carboxylate groups of 4-hydroxy- and 4-methoxybenzoate ligands, and the axial positions are occupied by aqua and DMF ligands, respectively. The three-dimensional supramolecular metal-organic framework of (I) consists of three different R2(2)(20) and an R4(4)(36) ring motif formed via O-H···O and OW-HW···O hydrogen bonds. Complex (II) simply packs as molecular species.

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In the crystal of the title compound, C6H9N3·C6H8O2, the 2-amino-4,6-di­methyl­pyrimidine and sorbic acid mol­ecules are linked through N—H⋯O and O—H⋯N hydrogen bonds, which generate a cyclic bimolecular heterosynthon with an R 2 2(8) graph-set motif. Further, two inversion-related pyrimidine mol­ecules are base-paired via a pair of N—H⋯N hydrogen bonds, forming a cyclic bimolecular homosynthon with a graph-set of R 2 2(8). A discrete hetero tetra­meric supra­molecular unit along the b axis is formed by the fusion of two heterosynthons and one homosynthon. An aromatic π–π inter­action [centroid–centroid distance = 3.7945 (16) Å] is observed between these tetra­meric units.