Molecular mechanics study of the complexes of β-Cyclodextrin with 4-(dimethylamino)benzonitrile and benzonitrile

Javier Pozuelo, Asao Nakamura, Francisco Mendicuti

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Molecular Mechanics calculations with the Tripos Force Field were employed to study the complexation of 4-(dimethylamino)benzonitrile (DMABN) and/or benzonitrile (BN) with β-cyclodextrin (βCD). The systems studied have 1 : 1 (DMABN : βCD and BN : βCD), 2 : 2 (DMABN : βCD) and 1 : 1: 2 (DMABN : BN : βCD) stoichiometries. Evidence for the formation of such complexes, binding constants and other thermodynamic parameters were extracted from the analysis of the steady state fluorescence measurements performed in a previous work. The Molecular Mechanics study, based on the energy changes upon guest-host approaching, was performed in vacuo and in the presence of water as a solvent. Results show that the driving forces for 1: 1 complexation are mainly dominated by non-bonded van der Waals host : guest interactions. However, the driving forces for association between 1 : 1 complexes to give 2 : 2 homo-or 1 : 1: 2 heterodimers are dominated by non-bonded electrostatic interactions. Head-to-head electrostatic interactions between βCDs, which are presumably due to the hydrogen bonding formation between secondary hydroxyl groups of CDs, are responsible for most of the stability of the dimers.

Original languageEnglish
Pages (from-to)467-485
Number of pages19
JournalJournal of Inclusion Phenomena
Volume35
Issue number3
DOIs
Publication statusPublished - 1999 Nov

Keywords

  • Cyclodextrins
  • Dimers
  • Inclusion complexes
  • Molecular mechanics calculations

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Condensed Matter Physics

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