Pillar[5]arene-Based Molecular Recognition Induced Crystal-to-Crystal Transformation and Its Application in Adsorption of Adiponitrile in Water

Single-crystal-to-single-crystal
(SCSC) transformations are of
wide interest in the research field of crystal engineering, which
are widely used for the precise study of the relationship between
structure and property. Here, we report one SCSC transformation triggered
by pillararene-based molecular recognition. One pillar[5]­arene-based
linear supramolecular polymer forms in the solid state initially and,
then, converts into side-chain polypseudorotaxane induced by molecular
recognition between a naphthalene-containing pillar[5]­arene NP5 and adiponitrile. Moreover, the SCSC transformation is
further applied in the efficient removal of adiponitrile from water.