Descrição eletrônica das ligações de halogênio: uma jornada em busca de novos potenciais empíricos

Abstract

The electronic effects in supramolecular systems are a great challenge for computational chemistry, and the understanding of ligand-protein interactions driven by Halogen Bonds can be limited by a Molecular Mechanics point of view. Our work enhances the statement that Halogen Bonds are led mainly by orbital interactions via σ*C-X. Nonetheless, we have pointed a straight relationship between the maximum ESP value on the σ-hole and the LUMO energy levels of the Halogen Bond donor. These evidences highlight the importance of electronic correlation description in Halogen Bonds. In fact, the electronic correlation has been a barrier for classical approaches. In line with this scenario, the current work introduces a new promising empirical potential based on quantum parameterizations able to describe general halogen bonded systems. The new parameters allow force fields to detect variations on the molecular electronic structure of halogenated organic compounds to improve the description of fluorine, chlorine and bromine in Halogen Bonds.