(-)-(R,R)-N,N '-bis(3-nitro-salicylidene)-1,2-cyclohexanediamine as a new host compound for aromatic guests through CH/JI interactions

Optically pure N, N'-bis(3-nitro-salicylidene)-1,2-cyclohexanediamine formed inclusion complex crystals with aromatic guest molecules (toluene, p-xylene, aniline), whereas the racemic or meso forms crystallized without inclusion of these guests. The guest aromatic rings are sandwiched by two host molecules involving the axial CH bonds of the cyclohexyl group to develop CH/JI interactions. p-Xylene was selectively extracted from the mixture of isomeric xylenes.