Coronene

• Hexabenzobenzol
• - circulene

Yellow to green powder

Fixed

438-440 ° C

525 ° C.

Insoluble in water

Template: Infobox chemical / molecular formula search available

Coronene ( Hexabenzobenzol ) belongs to the polycyclic aromatic hydrocarbons, or more precisely to the Circulenen. The molecule consists of six fused benzene rings (where free to contact using the circle for the identification of aromatic rings, some authors in the inner ring a seventh circle - but this seems to be more a philosophical question than a chemical ).

Synthetic coronene was first shown in 1932 by Kurt Meyer.

Occurrence

Coronene is like most polyaromatic molecules in coal tar and in products of incomplete combustion front, in addition in mineral Karpathit.

Properties

Coronene is a yellow powder until golden thread-like particles or acicular crystals. The solid melts at 438-440 ° C, boils at 525 ° C, is insoluble and soluble in nonpolar solvents with a light blue fluorescence in water. Coronene is very stable and has a very low vapor pressure. The Coronenmolekül is about 1 nanometer in size; it can be made ​​visible with a scanning tunneling microscope.