Later, the band of benzenoid
ring stretching at 1605 [cm.sup.-1] appears and the C=N stretching band shifts to the standard position for the PANI emeraldine base at 1468 [cm.sup.-1] [25, 32].
They are excellent scavengers of free radical that has been implicated in the pathologies of various human diseases, the antioxidant activity is dependent on the structure hydrophobic benzenoid
rings and hydrogen-bonding potential of the phenolic hydroxyl groups.
Kotschy, "Aromatic character of the benzene ring present in various topological environments in benzenoid
hydrocarbons play a vital role in our environment and in the food and chemical industries.
 argued that the structural figure of phenolic compounds has the potential to interact with several proteins; mainly, they have a hydrophobic benzenoid
ring and hydrogen-binding properties which enhance their capacity to be antioxidants by inhibiting several enzymes that catalyze radical generation, including xanthine oxidase, cytochrome P450 isoforms, cyclooxygenase, and lipoxygenase enzymes.
The resonant structure of the PEDOT changes from a benzenoid
structure to a quinoid structure after adding a sugar alcohol  initiating an ordered planar backbone [47, 48].
The caterpillar trees represent the structure of benzenoid
Three characteristic absorption bands are observed in the spectra of pani at 269 nm, 368 nm and 618nm wavelength, n-Alpani composite had absorption peaks at 270 nm, 371 nm and 633nm which are attributed to [pi] -[[pi].sup.*]conjugated ring systems, polaron -[[pi].sup.*] and [pi]-polaron benzenoid
to quinoid excitonic transition respectively.
The characteristic peaks of PANI from the Fig.8 were observed at 476.374 [cm.sup.-1] ( naphthalenes Out of plane ring bending), 800 [cm.sup.-1] (N-H out of plane bending absorption), 970 [cm.sup.-1] (C=C bending), 1150 [cm.sup.-1] (C-H bending mode of Q ring, 1296 [cm.sup.-1]C-N stretching of secondary aromatic amine),1494 [cm.sup.-1](C=C stretching/C=N asymmetric stretching/C-H bending modes of benzenoid
ring), 1560 [cm.sup.-1] (C=C stretching/C-H bending modes of quinoid ring)[15,16].
In addition, the molecular recognition for compound 8f is improved by two weak noncovalent intermolecular interactions: His47 and the furan oxygen with a distance of 2.69 [Angstrom] and a [pi]-sulfur interaction between Cys95 and the benzenoid
ring in the naphthoquinone moiety with a distance of 2.47 [Angstrom].
Gutman, "Randic index of benzenoid
systems and phenylenes," Croatica Chemica Acta, vol.
This is supported by the apolar nature of 6-shogaol due to the presence of a 10-carbon long hydrocarbon chain and benzenoid