Solid-state NMR and computational studies of tetratolyl urea calix[4]arene inclusion compounds

Phys Chem Chem Phys. 2009 Oct 28;11(40):9241-9. doi: 10.1039/b822535d. Epub 2009 Aug 17.

Abstract

Solid-state guest dynamics of tetratolyl tetraurea calix[4]arene tetrapentylether dimeric capsules filled with different types of aromatic guests such as benzene-d6, fluorobenzene-d5 and 1,4-difluorobenzene were studied. Upon inclusion, all guest moieties revealed complexation-induced shifts varying from 2.8 ppm to 5.1 ppm. All guest molecules were shown to undergo distinct motions, ranging from mere C6-rotations of benzene-d6 to (ill-defined) 180 degrees phenyl flips of fluorobenzene-d5. In all cases, dynamic heterogeneities were identified based on 2H lineshape deconvolution. In addition, by combination of both a computed nucleus independent chemical shift (NICS) map and explicit 19F and 2H ab initio DFT chemical shift calculations, the preferred orientation of the guest molecules within the host was derived.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzene / chemistry
  • Calixarenes / chemistry*
  • Magnetic Resonance Spectroscopy
  • Molecular Conformation
  • Molecular Dynamics Simulation
  • Phenols / chemistry*
  • Quantum Theory*
  • Urea / chemistry*

Substances

  • Phenols
  • calix(4)arene
  • Calixarenes
  • Urea
  • Benzene