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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/129441
Title: 
Theoretical study of molecular and electronic structures of 5(1) knot systems: two-layered ONIOM calculations
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Estadual de Campinas (UNICAMP)
ISSN: 
0103-5053
Sponsorship: 
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Abstract: 
In this study we examine the electronic and molecular structures of the [5(1) knot center dot center dot center dot(PF6)(10)](+) pentafoil knot system and report calculated interaction energies that result from halides (X = F, Cl, Br, and I) localized at the center of the [5(1) knot center dot center dot center dot(PF6)(9)]X molecular structure. The equilibrium geometries were fully optimized at the ONIOM(M06/6-31G(2d,p):PM6) level of theory, starting from an initial geometry for the pentafoil knot obtained from experimental X-ray data. The molecular systems were divided into two layers, for which the M06/6-31G(2d, p) level of theory was used to describe the high layer ([C4H6](5)X-structure) and the PM6 semiempirical method was employed for the low layer. The calculated electronic energies show that the interaction between the fluorine anion and the pentafoil knot produces the most stable structure, whereas an unfavorable interaction is observed for iodide due to the diffuse character of its electronic cloud. Using basis set superposition error (BSSE) correction techniques, the observed values of the interaction are -0.201 hartrees for the fluoride ion and -0.100 hartrees for iodide.
Issue Date: 
1-May-2015
Citation: 
Journal Of The Brazilian Chemical Society, v. 26, n. 5, p. 1028-1033, 2015.
Time Duration: 
1028-1033
Publisher: 
Soc Brasileira Quimica
Keywords: 
  • Electronic and molecular structures
  • Pentafoil knot
  • ONIOM
Source: 
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000501028&lng=en&nrm=iso&tlng=en
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/129441
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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