A generalized operational formula based on total electronic densities to obtain 3D pictures of the dual descriptor to reveal nucleophilic and electrophilic sites accurately on closed-shell molecules

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7 Citations (Scopus)

Abstract

By means of the conceptual density functional theory, the so-called dual descriptor (DD) has been adapted to be used in any closed-shell molecule that presents degeneracy in its frontier molecular orbitals. The latter is of paramount importance because a correct description of local reactivity will allow to predict the most favorable sites on a molecule to undergo nucleophilic or electrophilic attacks; on the contrary, an incomplete description of local reactivity might have serious consequences, particularly for those experimental chemists that have the need of getting an insight about reactivity of chemical reagents before using them in synthesis to obtain a new compound. In the present work, the old approach based only on electronic densities of frontier molecular orbitals is replaced by the most accurate procedure that implies the use of total electronic densities thus keeping consistency with the essential principle of the DFT in which the electronic density is the fundamental variable and not the molecular orbitals. As a result of the present work, the DD will be able to properly describe local reactivities only in terms of total electronic densities. To test the proposed operational formula, 12 very common molecules were selected as the original definition of the DD was not able to describe their local reactivities properly. The ethylene molecule was additionally used to test the capability of the proposed operational formula to reveal a correct local reactivity even in absence of degeneracy in frontier molecular orbitals.

Original languageEnglish
Pages (from-to)2279-2303
Number of pages25
JournalJournal of Computational Chemistry
DOIs
Publication statusPublished - 30 Sep 2016

Keywords

  • conceptual density functional theory
  • degeneracy in frontier molecular orbitals
  • dual descriptor
  • electronic densities
  • electrophilic Fukui function
  • nucleophilic Fukui function
  • symmetric molecules
  • total electronic densities

ASJC Scopus subject areas

  • Chemistry(all)
  • Computational Mathematics

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