Crystal structure of the 1:2 co-crystal of 1,3,6,8-tetra-aza-tri-cyclo-[4.3.1.1(3,8)]undecane (TATU) and 4-chloro-phenol (1/2).

In the title compound, C(7)H(14)N(4)·2C(6)H(5)ClO, which crystallized with two crystallographically independent 4-chloro-phenol mol-ecules and one 1,3,6,8-tetra-aza-tri-cyclo-[4.3.1.1(3,8)]undecane (TATU) mol-ecule in the asymmetric unit, the independent components are linked by two O-H⋯N hydrogen bonds. The hydrogen-bond acceptor sites are two non-equivalent N atoms from the aminal cage structure, and the tricyclic system distorts by changing the C-N bond lengths. In the crystal, these hydrogen-bonded aggregates are linked into chains along the c axis by C-H⋯N hydrogen bonds. The crystal structure also features C-H⋯π contacts.