Theoretical study of - stacking interactions in substituted-coronene||cyclooctatetraene complexes: A system without direct electrostatic effects of substituents

Document Type: Research Paper

Author

Department of Chemistry, Faculty of Science, University of Zabol, P.O. Box 98613-35856, Zabol, Iran

Abstract

Stability of the ;-; stacking interactions in the substituted-coronene||cyclooctatetraene complexes was
studied using the computational quantum chemistry methods (where || denotes ;–; stacking
interaction, and substituted-coronene is coronene which substituted with four similar X groups; X =
OH, SH, H, F, CN, and NO). There are meaningful correlations between changes of geometrical
parameters and topological properties of the electron charge densities at ring critical points due to
formation of complexes and ;-; stacking binding energies. In these complexes both electronwithdrawing
and electron-donating substituents lead to larger binding energies compared to X = H
(unsubsitituetted-coronene||cyclooctatetraene complex).This finding was interpreted on the basis of
NMR data, especially spin-spin coupling constants between C atoms of cyclooctatetraene and C atoms
at central rings of substituted-coronenes. Herein, relationships between the ;–; stacking binding
energy (-E) values and, through-space C-C spin-spin coupling constants (JC-C) in the substitutedcoronene||
cyclooctatetraene complexes has been investigated in the complexes without direct
electrostatic effects of substituents.

Keywords