Aromaticity

All brighteners have extended conjugation and/or aromaticity, allowing for electron movement.

Aromaticity Aromatic C, O, S and N atoms are shown in their lower case 'c', 'o', 's' and 'n' respectively.

For "conventional" cyclic compounds, aromaticity is conferred by the presence of 4n + 2 delocalized pi electrons, where n is an integer.

In 3D Metal aromaticity in metal clusters is another example of delocalization, this time often in three-dimensional entities.

It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity ).

The term 'aromatic' was assigned before the physical mechanism determining aromaticity was discovered; the term was coined as such simply because many of the compounds have a sweet or pleasant odour.

Uracil undergoes amide-imidic acid tautomeric shifts because any nuclear instability the molecule may have from the lack of formal aromaticity is compensated by the cyclic-amidic stability.