Unraveling the Bonding and Aromaticity of Pentazole, Pentaphosphole, and Cyclopentadiene Anions: A Comprehensive Study.

This study investigates π-delocalization, π-bonding situations, and aromaticity of the pentazolate anion ([cyclo-N], ()), which was detected by Christe in 2002. To gain a broader perspective, we investigated the iso-π-electronic species [cyclo-P] () and [cyclo-(CH)] (). VB analyses reveal that the three studied molecules display significant resonance stabilization, as indicated by their high resonance energy values. A comprehensive analysis of aromaticity was conducted using electronic and magnetic aromaticity indices, revealing that all three anions exhibit strong π-aromaticity and relatively weak σ-aromaticity.