Title: Ring currents and magnetic properties of s-indacene, an archetypal paratropic, non-antiaromatic molecule
Authors: Jartin, RS ×
Ligabue, A
Soncini, Alessandro
Lazzeretti, P #
Issue Date: Jan-2002
Publisher: Amer chemical soc
Series Title: Journal of Physical Chemistry A vol:106 issue:48 pages:11806-11814
Abstract: Magnetic susceptibility and nuclear magnetic shielding at the nuclei of s-indacene have been evaluated by a series of different approximations and a large Gaussian basis set. An ab initio model of magnetic field induced current density was developed, showing that intense paramagnetic flow takes place within the, electrons. It causes strong upfield chemical shift of protons attached to hexagonal and pentagonal rings. The magnetic susceptibility tensor is typical of a diamagnetic molecule but is characterized by small anisotropy. Group-theoretical methods developed by Steiner and Fowler indicate that s-indacene can be classified as a 2p + 4d system, in which the paramagnetic circulation of two electrons in the highest occupied orbital of B-g symmetry overwhelms the diamagnetic flow of four electrons in occupied A. orbitals. Because of its unique structural and magnetic properties, s-indacene can be described as a limit system between the classes of aromatic and antiaromatic molecules.
ISSN: 1089-5639
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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