Superphenalene is a very large, synthetic polycyclic aromatic hydrocarbon (PAH) with chemical formula C96H30.

[1] It can be considered as an overlapping structure of three hexa-peri-hexabenzocoronenes arranged symmetrically around a center.

[2][3] These have also been known as building blocks of molecular electronics since 2004 as they form self-assembling columns and nanotubes.

Due to the low solubility of these compounds, they could only be characterized by mass spectrometry when they were first synthesized, as neither NMR nor UV-Vis data could be collected.

With 540,000 mesomeric boundary structures, it has significantly more than hexabenzocoronene (250), supernaphthalene (16,100) and also buckminsterfullerene (12,500).