Aromaticity of the doubly charged [8]circulenes

Gleb V. Baryshnikov, Rashid R. Valiev, Nataliya N. Karaush, Dage Sundholm, Boris F. Minaev

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Magnetically induced current densities and current pathways have been calculated for a series of fully annelated dicationic and dianionic tetraphenylenes, which are also named [8]circulenes. The gauge including magnetically induced current (GIMIC) method has been employed for calculating the current density susceptibilities. The aromatic character and current pathways are deduced from the calculated current density susceptibilities showing that the neutral [8]circulenes have two concentric pathways with aromatic and antiaromatic character, respectively. The inner octatetraene core (the hub) is found to sustain a paratropic (antiaromatic) ring current, whereas the ring current along the outer part of the macrocycle (the rim) is diatropic (aromatic). The neutral [8]circulenes can be considered nonaromatic, because the sum of the ring-current strengths of the hub and the rim almost vanishes. The aromatic character of the doubly charged [8]circulenes is completely different: the dianionic [8]circulenes and the OC-, CH-, CH2-, SiH-, GeH-, SiH2-, and GeH2-containing dicationic species sustain net diatropic ring currents i.e., they are aromatic, whereas the O-, S-, Se-, NH-, PH- and AsH-containing dicationic [8]circulenes are strongly antiaromatic. The present study also shows that GIMIC calculations on the [8]circulenes provide more accurate information about the aromatic character than that obtained using local indices such as nuclear-independent chemical shifts (NICSs) and 1H NMR chemical shifts.

Original languageEnglish
Pages (from-to)8980-8992
Number of pages13
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number13
DOIs
Publication statusPublished - 7 Apr 2016

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ring currents
Induced currents
Current density
Chemical shift
Gages
hubs
current density
rims
chemical equilibrium
magnetic permeability
Nuclear magnetic resonance
methylidyne
nuclear magnetic resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Baryshnikov, G. V., Valiev, R. R., Karaush, N. N., Sundholm, D., & Minaev, B. F. (2016). Aromaticity of the doubly charged [8]circulenes. Physical Chemistry Chemical Physics, 18(13), 8980-8992. https://doi.org/10.1039/c6cp00365f

Aromaticity of the doubly charged [8]circulenes. / Baryshnikov, Gleb V.; Valiev, Rashid R.; Karaush, Nataliya N.; Sundholm, Dage; Minaev, Boris F.

In: Physical Chemistry Chemical Physics, Vol. 18, No. 13, 07.04.2016, p. 8980-8992.

Research output: Contribution to journalArticle

Baryshnikov, GV, Valiev, RR, Karaush, NN, Sundholm, D & Minaev, BF 2016, 'Aromaticity of the doubly charged [8]circulenes', Physical Chemistry Chemical Physics, vol. 18, no. 13, pp. 8980-8992. https://doi.org/10.1039/c6cp00365f
Baryshnikov, Gleb V. ; Valiev, Rashid R. ; Karaush, Nataliya N. ; Sundholm, Dage ; Minaev, Boris F. / Aromaticity of the doubly charged [8]circulenes. In: Physical Chemistry Chemical Physics. 2016 ; Vol. 18, No. 13. pp. 8980-8992.
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