Calix[4]pyrrole[2]carbazole: a new kind of expanded calixpyrrole

J Am Chem Soc. 2004 Dec 15;126(49):16073-6. doi: 10.1021/ja045218q.

Abstract

The synthesis and anion binding properties of a new class of calixpyrrole analogue, containing two carbazole subunits in lieu of two of the four acetone bridging elements normally found in calix[4]pyrrole, is described. The compound exists in a winglike structure in the solid state, as judged from single-crystal X-ray diffraction analyses of both the free system and the corresponding benzoate anion complex. Evidence for anion binding in dichloromethane solution was obtained from static fluorescent quenching experiments; these latter revealed a slight preference for acetate relative to other carboxylate anions (e.g., benzoate, oxalate, succinate), as well as various other anionic substrates (i.e., chloride and dihydrogen phosphate). No evidence of binding was observed in the case of bromide, nitrate, and hydrogen sulfate.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Calixarenes / chemical synthesis
  • Calixarenes / chemistry*
  • Carbazoles / chemical synthesis
  • Carbazoles / chemistry*
  • Kinetics
  • Molecular Structure
  • Porphyrins / chemical synthesis
  • Porphyrins / chemistry*
  • X-Ray Diffraction

Substances

  • Carbazoles
  • Porphyrins
  • calix(4)pyrrole
  • calix(4)pyrrole(2)carbazole
  • Calixarenes