Rationalizing the Effect of Halogenation on the Molecular Structure of Simple Cyclobutene Derivatives by Topological Real-Space Analysis of Their Electron Density (Articolo in rivista)

Type
Label
  • Rationalizing the Effect of Halogenation on the Molecular Structure of Simple Cyclobutene Derivatives by Topological Real-Space Analysis of Their Electron Density (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Lo Presti, L.; Ellern, A.; Destro, R.; Soave, R.; Lunelli, B. (2011)
    Rationalizing the Effect of Halogenation on the Molecular Structure of Simple Cyclobutene Derivatives by Topological Real-Space Analysis of Their Electron Density
    in The journal of physical chemistry. A. (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lo Presti, L.; Ellern, A.; Destro, R.; Soave, R.; Lunelli, B. (literal)
Pagina inizio
  • 12695 (literal)
Pagina fine
  • 12707 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 115 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • DOI: 10.1021/jp203615x (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Chimica Fisica ed Elettrochimica, Universita' degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy [L. Lo Presti, R. Destro] Istituto di Scienze e Tecnologie Molecolari, CNR-ISTM, Via Golgi 19, 20133 Milano, Italy [R. Soave] Chemistry Department, Iowa State University, 1711 Gilman Hall, Ames, 50011 Iowa, United States [A. Ellern] Istituto per lo Studio dei Materiali Nanostrutturati (ISMN) CNR, Via P.Gobetti, 101, 40129 Bologna, Italy [B. Lunelli] (literal)
Titolo
  • Rationalizing the Effect of Halogenation on the Molecular Structure of Simple Cyclobutene Derivatives by Topological Real-Space Analysis of Their Electron Density (literal)
Abstract
  • The accurate gas-phase equilibrium structures on the ground-state potential energy surface of the complete series of fluorinated and chlorinated cyclobutene derivatives with C2v symmetry have been evaluated at DFT PBE0/6-311++G(d,p) theory level. The optimized geometries have been compared with all the available experimental data reported in the literature, as obtained by microwave spectroscopy (MW) and gas-phase electron diffraction (GED) techniques. For hexafluorocyclobutene and 1,2-dichloro-3,3',4,4'-tetrafluorocyclobut-1-ene, the results of accurate low-temperature single-crystal X-ray diffraction experiments have also been considered. Structural changes within the cyclobutene ring, as induced by fluorination and chlorination at allylic and vinylic positions, have been correlated with changes in the corresponding theoretical charge densities. To this aim, several local and nonlocal topological descriptors provided by the quantum theory of atoms in molecules, QTAIM, have been employed, with particular emphasis on the delocalization indices and integrated source function decomposition schemes. Key factors for the resulting molecular structures are the chemical nature and the steric hindrance of the substituents, as well as quantum-mechanical effects, such as delocalization and partial conjugation. When fluorine atoms replace hydrogens at allylic or vinylic positions, the corresponding Csp3—Csp3 or Csp2=Csp2 bonds between the substituted carbons undergo a significant strengthening, while chlorination has just the opposite effect. In the latter case the steric hindrance between bulky chlorine atoms occupying vicinal positions is crucial in determining the single Csp3—Csp3 bond length. These findings are discussed in the context of the reactivity of chemically related chlorofluorocarbon compounds. (literal)
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