Molecular recognition of chloroform by divergent polymorphic transitions in tert-butylthiacalix[4]arene tetrasubstituted with N-(2-hydroxyethyl)carbamoylmethoxy groups in a lower rim

The genuine molecular recognition of chloroform by a tert-butylthiacalix[4]arene derivative was observed, where the host remembers the guest above its elimination point showing two polymorphic transitions with opposite heat effects.