Benzenoid polyaromatic

The vast majority of aromatic compounds have a closed loop of six electrons in a ring (the aromatic sextet), and we consider these compounds first. It is noted that a formula periodic table for the benzenoid polyaromatic hydrocarbons has been developed. ... 

Generalized Polansky index [97] gauges the aromaticity of individual benzenoid rings in polyaromatic hydrocarbons [98] by its similarity to benzene. It uses the electron density itself as a tool to explain aromaticity rather than the structural features or quantities derived from electron density. It is derived from the concept proposed by Derflinger and Polansky [99] published in 1967 for explaining aromaticity in polyaromatic compounds and is expressed as follows ... 

---