Inclusion of polyhalomethanes by a tetrahalogenated diquinoline host

Abstract

The dichloro diphenyl diquinoline 7 and its dibrominated derivative 4 do not crystallise as structures assembled from the dimeric aryl (EF)₆ brick-like unit used by their non-chlorinated analogues. Instead, several other types of intermolecular assembly are employed. Compound 4 forms lattice inclusion compounds when recrystallised from polyhalomethanes but yields the apohost structure from other solvents. The X-ray structures, supramolecular synthons, molecular packing, and crystal energies, of this series of compounds are described and compared.