Dimeric capsules formed by Tetra-CMPO derivatives of (Thia)Calix[4]arenes

  • Rudzevich V
  • Kasyan O
  • Drapailo A
 et al. 
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Thiacalix[4]arene 2, calix[4]arene 3a and its tetraether fixed in the cone conformation 3b form homo- and heterodimeric capsules in apolar solvents, which are held together by a seam of NH...O=P hydrogen bonds between carbamoylmethyl phosphine oxide functions attached to their wide rim. Their internal volume of approximately 370 A(3) requires the inclusion of a suitable guest. Although neutral molecules such as adamantane (derivatives) or tetraethylammonium cations form kinetically stable complexes ((1)H- and (31)P-time scale), the included solvent is rapidly exchanged. The internal mobility of the included tetraethylammonium cation is distinctly higher (DeltaG=42.5 and 49.7 kJ mol(-1) for 3a and 3b) than that for similar capsules of tetraurea calix[4]arenes 1. Mixtures of 1 with 2, 3a, or 3b contain only the two homodimers but the heterodimerization occurs with the tetraloop tetraurea 6, which cannot form homodimers. Two dimers with cationic guests (2.(C(5)H(5))(2)Co(+).2 and 3a.Et(3)NH(+).H(2)O.3a) were confirmed by single-crystal X-ray analysis.

Author-supplied keywords

  • Amides
  • Calixarenes
  • Dimerization
  • Host-guest systems
  • Self-assembly

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  • Valentyn Rudzevich

  • Oleg Kasyan

  • Andriy Drapailo

  • Michael Bolte

  • Dieter Schollmeyer

  • Volker Böhmer

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