Mechanochemical synthesis and crystal structure of a 1:2 co-crystal of 1,3,6,8-tetra­aza­tri­cyclo[4.3.1.13,8]undecane (TATU) and 4-chloro-3,5-dimethyl­phenol

Solvent-free treatment of 1,3,6,8-tetra­aza­tri­cyclo­[4.3.1.13,8]undecano (TATU) with 4-chloro-3,5-di­methyl­phenol led to the formation of the title co-crystal, C7H14N4·2C8H9ClO. The asymmetric unit contains one aminal cage mol­ecule and two phenol mol­ecules linked via two O—H⋯N hydrogen bonds. In the aminal cage, the N–CH2–CH2–N unit is slightly distorted from a syn periplanar geometry. Aromatic π–π stacking between the benzene rings from two different neighbouring phenol mol­ecules [centroid–centroid distance = 4.0570 (11) A] consolidates the crystal packing.