Superstructure Topologies and Host−Guest Interactions in Commensurate Inclusion Compounds of Urea with Bis(methyl ketone)s

Urea inclusion compounds containing aliphatic bis(methyl ketone) guests exhibit a common packing motif in which urea molecules turn about their 2-fold axes to form hydrogen-bonded tethers between guest molecules in adjacent channels. Because this motif is so reliable, it is possible to predict the superstructure topologies of the hydrogen-bonded networks of several bis(methyl ketone)/urea inclusion compounds and related systems. This constitutes an important step in the design of new ferroelastic inclusion compounds.