Two- and Three-Dimensional Hydrogen-Bonding Networks in the Structures of 4,4'-Dihydroxybenzophenone and 4,4'-Thiodiphenol

The two independent molecules in the structure of 4,4′-dihydroxybenzophenone, OC(C₆H₄OH)₂, are joined by O-H...O hydrogen bonds involving only hydroxy groups into chains each consisting of a single type of molecule, with O...O distances of 2.791 (4) and 2.785 (4) Å in the two types of chain: the chains are then linked into sheets by hydrogen bonds using carbonyl oxygen atoms as acceptors [O...O 2.627 (4) and 2.624 (4) Å]. In the structure of 4,4′-thiodiphenol, S(C₆H₄OH)₂, the molecules are linked into chains via centrosymmetric (OH)₂ motifs [O...O 2.755 (3) and 2.808 (3) Å] which are cross-linked by further O-H...O hydrogen bonds [O...O 2.710 (3) Å] to give a three-dimensional network.

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