Halide anion recognition by calix[4]pyrrole: A quantum chemical study

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Abstract

The spherical recognition of halide anions by the calix[4]pyrrole molecule has been investigated with the aid of Hartree-Fock, hybrid DPT (B3LYP), and semi-empirical (PM3) quantum chemical methods. The free calix[4]pyrrole molecule adopts the 1,3-alternate conformation, as confirmed by an earlier X-ray crystal structure analysis, whereas a transition to a cone-like conformation occurs upon capture of a single halide anion. The calculated binding energies of the calix[4]pyrrole: halide anion complexes decrease monotonically along the group 17 anions, i.e. from fluoride to iodide, in agreement with the experimentally determined binding constants. Furthermore, a linear correlation of the calculated binding energy against both the standard reduction potential and the Pauling electronegativity has been found. Finally, a possible mechanism of halide anion capture by the calix[4]pyrrole receptor has been proposed on the basis of both theoretical calculations and crystallographic data.

Original languageEnglish
Pages (from-to)117-127
Number of pages11
JournalJournal of Molecular Structure: THEOCHEM
Volume581
Issue number1-3
DOIs
Publication statusPublished - 2002 Apr 5
Externally publishedYes

Keywords

  • Calix[4]pyrrole
  • DFT
  • HF-MO
  • Halide anion recognition
  • PM3 calculations

ASJC Scopus subject areas

  • Biochemistry
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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