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

Texto completo
Teodoro, Tiago Q. [1] ; Haiduke, Roberto L. A. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Quim Sao Carlos, Dept Quim & Fis Mol, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: RSC ADVANCES; v. 4, n. 75, p. 39853-39859, 2014.
Citações Web of Science: 0

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. (AU)

Processo FAPESP: 12/22143-5 - Desenvolvimento de conjuntos polarizados de funções de base relativísticas do tipo Gaussianas e aplicações em cálculos relativísticos
Beneficiário:Tiago Quevedo Teodoro
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 10/18743-1 - Uso de multipolos da teoria quântica de átomos em moléculas e estudos cinéticos em sistemas encontrados no meio interestelar
Beneficiário:Roberto Luiz Andrade Haiduke
Linha de fomento: Auxílio à Pesquisa - Regular