Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 112, Issue 50, Pages 13231-13238Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp803745f
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In the present work, we analyze the T-electronic delocalization in a series of annulenes and their dications and dianions by using electron delocalization indices calculated in the framework of the quantum theory of atoms in molecules. The aim of our study is to discuss the Huckel's 4n + 2 rule from the viewpoint of pi-electronic delocalization. Our results show that there is an important increase of electronic delocalization (of about 1 e) when going from antiaromatic 4n pi systems to aromatic (4n + 2)pi systems. Less clear is the change in pi-electronic delocalization when we move from a (4n + 2)pi-aromatic to a 4n pi-antiaromatic species by adding or removing a pair of electrons.
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