Modeling catalytic effects of clay mineral surfaces on peptide bond formation

Adélia J.A. Aquino, Daniel Tunega, Martin H. Gerzabek, Hans Lischka

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The catalysis of the amide-bond formation for the concerted reaction of acetic acid and methylamine on clay mineral surfaces has been studied by means of density functional theory calculations. Two typical cluster models for surface defects representing hydrogen-bonded interactions (physical defect) and a Lewis acid (chemical) defect have been selected. Additionally, a series of catalysts of varying strength (Al3+, AlCl3, Al(OH) 3, [Al(H2O)5]3+, H+, H3O+, H3O+-H2O, H 2O, and (H2O)2), which can act as Lewis or Brønsted acids was investigated as well. Reaction energies, activation barriers and corresponding thermodynamic quantities have been calculated. The results show a strongly asynchronous mechanism with the prior formation of a N-C dative bond followed by a proton transfer from nitrogen to oxygen as the rate-determining step. The barrier height was reduced substantially by the interaction with the catalyst. Solvation effects were taken into account by explicit inclusion of water molecules and by the polarizable continuum solvation model (PCM).

Original languageEnglish
Pages (from-to)10120-10130
Number of pages11
JournalJournal of Physical Chemistry B
Volume108
Issue number28
DOIs
StatePublished - Jul 15 2004

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