In the 1:1 adduct formed between 4,4'-thiodiphenol [S(C6H4OH)(2)] and
piperazine (C4H10N2), the components are linked into chains by O-H...N
hydrogen bonds, with an O...N distance of 2.725(3) Angstrom. These ch
ains are themselves cross-linked into sheets by N-H...pi(arene) hydrog
en bonds.