Jump to main content
Jump to site search


Unraveling the regioselectivity of odd electron halogen bond formation using electrophilicity index and chemical hardness parameters

Author affiliations

Abstract

Odd electron halogen bonding of freons with five different free radicals have been investigated using M06-2X/6-311G++(d,p). Conceptual density functional theory parameters such as Fukui functions, electrophilicity index and chemical hardness have been utilised to examine the regioselectivity and strength of free radical induced halogen bonding. The strong electrophilic radical Cl˙ forms three-electron bonds upon interacting with the nucleophilic ring surrounding the sigma hole or fk regions. This behavior is also observed for moderately electrophilic radicals OH˙ and OCl˙ for complexation with CHFCl2 only. In other complexes, these radicals along with least nucleophilic radicals ˙NO and ˙Ph form one-electron bond with sigma hole or fk+ regions of freons. This regioselectivity of radicals and the interaction energy upon complexation have been explained in terms of local electrophilicity index and chemical hardness. We hope that this finding will shed light on the understanding of non-covalent interactions in terms of conceptual density functional theory for halogen bonding as well as in pnictogen, chalcogen and tetrel bonding systems. This result may find applications in understanding the radical mediated reactions and ozone depletion in the stratosphere.

Graphical abstract: Unraveling the regioselectivity of odd electron halogen bond formation using electrophilicity index and chemical hardness parameters

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Oct 2019, accepted on 15 Nov 2019 and first published on 15 Nov 2019


Article type: Paper
DOI: 10.1039/C9CP05374C
Phys. Chem. Chem. Phys., 2019, Advance Article

  •   Request permissions

    Unraveling the regioselectivity of odd electron halogen bond formation using electrophilicity index and chemical hardness parameters

    P. Bandyopadhyay, S. Ray and Md. M. Seikh, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP05374C

Search articles by author

Spotlight

Advertisements