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In the title complex, [CdBr2(C10H8N2)2], a crystallographic twofold rotation axis passes through the CdII ion, which is six-coordinated by four N atoms of two symmetry-related 2,2′-bipyridine ligands and two symmetry-related Br− anions.

In the title compound, C13H28N2 2+·SO4 2−·H2O, extensive hydrogen-bonding interactions between the protonated 4,4′-(propane-1,3-diyl)dipiperidinium ions, the sulfate anions and the water molecules lead to a three-dimensional pillared and layered structure with the 4,4′-(propane-1,3-diyl)dipiperidinium ions acting as the pillars.

In the title compound, C6H14N2+·C8H4O4 2−, the protonated 1,4-diazoniabicyclo[2.2.2]octane cations and the deprotonated terephthalate anions are alternately linked by N—H...O hydrogen bonds into chains.

In the title compound, [Zn2(SO3)2(C10H8N2)2], Zn2+ and SO32− form a dinuclear unit, with an inversion center at the mid-point of the Zn⋯Zn vector. Each Zn atom has distorted octa­hedral geometry and is coordinated by four O atoms from two SO32− anions and two N atoms of the 2,2′-bipyridine ligand.

In the title compound, [Zn(C8H4O4)(C13H14N2)]n, each Zn atom is coordinated by two terephthalate and two 1,3-di-4-pyridylpropane ligands in a distorted tetra­hedral fashion. As a result, undulating layers are formed perpendicular to the b axis.