An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

In the hydrogen-bonded structure of the title compound, C 12 H 10 O 2 .C 10 H 8 N 2 , the molecular components are linked by O-H...N hydrogen bonds having O...N distances of 2.793 (3) and 2.750 (3) A into C 2 2 (16) chains which are coiled round 2 1 screw axes forming triple helices.

In the title compound, C 12 H 10 O 2 .C 12 H 8 N 2 , there is an intramolecular O-H…O hydrogen bond within the 2,2'-biphenol component which is linked to the 1,10-phenanthroline component via a three-centre hydrogen bond involving both N atoms as acceptors. The bimolecular aggregates are linked by C-H…O hydrogen bonds into spiral chains along [010], and these, in turn, are linked into a sheet parallel to (101) by π-π stacking interactions between pairs of 1,10-phenanthroline units related by centres of inversion.

Tn the 1:2 adduct formed between 1,3,5-trihydroxybenzene (phloroglucinol) and 2,2'-bipyridyl, C6H6O3.2C(10)H(8)N(2), the triol molecules and half of the bipyridyl molecules are linked into chains by means of O-H ... N hydrogen bonds, forming a stem, while the other half of the bipyridyl molecules are pendent from this stem, via O-H ... N hydrogen bonds.

In the hydrogen-bonded structure of the title complex, O2S(C6H4OH)(2).C10H8N2 or C12H10O4S.C10OH8N2, the bis-phenol molecules are linked into C(8) chains by means of O-H ... O=S hydrogen bonds, and the 2,2'- bipyridyl units, which act as single accepters only, are pendent from these chains by means of O-H ... N hydrogen bonds. Pairs of these chains, related by centres of inversion, are mutually interlocked via their pendent arms.