Hydrogen-Bonded Chains in 4,4'-Dihydroxybenzophenone–4,4'-Bipyridyl (1/1) and Chains of Rings in 1,3,5-Trihydroxybenzene–4,4'-Bipyridyl (2/3)

In the 1:1 adduct of 4,4′-dihydroxybenzophenone and 4,4′-bipyridyl, [OC(C₆H₄OH)₂].(NC₅H₄—C₅H₄N), the components are linked into chains by O—H...N hydrogen bonds. In the 2:3 adduct formed between 1,3,5-trihydroxy­benzene and 4,4′-bipyridyl, 2[C₆H₃(OH)₃]·3(NC₅H₄—C₅H₄N), pairs of molecules of each component are linked by O—H...N hydrogen bonds into macrocyclic rings, which are themselves linked by further 4,4′-bipyridyl molecules into chains-of-rings; these chains are cross-linked by C-H...O hydrogen bonds.

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