Hydrogen-bonded dimers of a thiacalixarene substituted by carbamoylmethylphosphineoxide groups at the wide rim

Abstract

A thiacalix[4]arene derivative bearing four carbamoylmethylphosphineoxide groups at the wide rim forms hydrogen-bonded, dimeric capsules with S₈ symmetry in the crystalline state and in apolar solvents, where the inclusion of cationic guests could be proved by ¹H NMR and ESI mass spectra.