Issue 75, 2014

A theoretical analysis of atomic charge fluxes in chlorofluoromethanes and relationship with bonding character descriptors

Abstract

In this study, intramolecular electronic charge fluxes in chlorofluoromethanes, which take place during atomic stretching displacements, were analyzed in terms of bond character descriptors. Topological parameters of the electron density at the critical points of C–X bonds (X = H, F or Cl) and charge fluxes were obtained through the Quantum Theory of Atoms in Molecules (QTAIM). All calculations were done at the CCSD/cc-pVQZ level of theory. Thus, we have noticed that the covalent character of C–H, C–Cl and C–F bonds seems to increase as hydrogen atoms are replaced by halogens in other bonding sites of those molecules. This is attributed to polarizations induced over the carbon atom by the negatively charged substituents. It was also observed that the charge fluxes at the atoms of enlarged C–H bonds are linearly related to these bond character parameters. A similar pattern of charge fluxes is likewise seen for C–Cl and C–F bonds. However, the displacement of halogen atoms results in a larger delocalization of the charge fluxes (long range electronic charge transfers). This probably leads to a further observed separation into subgroups of molecules with appropriate linear relationships between halogen charge fluxes and bond character descriptors.

Graphical abstract: A theoretical analysis of atomic charge fluxes in chlorofluoromethanes and relationship with bonding character descriptors

Supplementary files

Article information

Article type
Paper
Submitted
07 Jul 2014
Accepted
20 Aug 2014
First published
20 Aug 2014

RSC Adv., 2014,4, 39853-39859

Author version available

A theoretical analysis of atomic charge fluxes in chlorofluoromethanes and relationship with bonding character descriptors

T. Q. Teodoro and R. L. Andrade Haiduke, RSC Adv., 2014, 4, 39853 DOI: 10.1039/C4RA06781A

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