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In the crystal structure of the title complex, [YbCl2(C18H15N5)(CH3OH)2]Cl, the pseudo-penta­gonal–bipyramidal coordination geometry of the YbIII cation is composed of three N atoms from one cis-(±)-2,4,5-tris­(pyridin-2-yl)imidazoline (HL) ligand, two O atoms from two methanol mol­ecules and two Cl anions. Chains are formed along [010] through N—H...Cl, O—H...Cl and O—H...N hydrogen bonds.

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The binuclear title compound, [Cu2(CH3CO2)4(C6H5NO)], is located about a center of inversion. The CuII atoms are connected [Cu—Cu = 2.6134 (5) Å] and bridged by four acetate ligands. Their distorted octa­hedral coordination geometry is completed by a terminal pyridine N atom of a 3-pyridincarboxaldehyde ligand. In the crystal, the complex mol­ecules are linked by C—H...O hydrogen bonds, forming two-dimensional networks lying parallel to the ab plane. These networks are linked via C—H...O hydrogen bonds involving inversion-related 3-pyridinecarboxaldehyde ligands, forming a three dimensional supra­molecular architecture.

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The title 2:1 co-crystal, 2C12H10N2·C8H6O4, crystallizes with one mol­ecule of 4-[(E)-2-(pyridin-2-yl)ethen­yl]pyridine (A) and one half-mol­ecule of terephthalic acid (B) in the asymmetric unit. In the crystal, the components are linked through heterodimeric COOH...Npyridine synthons, forming linear aggregates of composition –ABAB–. Further linkage through weak C—H...O and C—H...π inter­actions gives two-dimensional hydrogen-bonded undulating sheets propagating in the [100] and [010] directions. These layers are connected through additional weak C—H...O contacts, forming a three-dimensional structure.
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