Buckminsterfullerene

Buckminsterfullerene (IUPAC name (C₆₀-I_h)[5,6]fullerene) is the smallest fullerene in which no two pentagons share an edge (which can be destabilizing — see pentalene). It is also the most common in terms of natural occurrence, as it can often be found in soot.

The structure of C₆₀ is a truncated T=3 icosahedron, which resembles a round soccer ball of the type made of hexagons and pentagons, with a carbon atom at the corners of each hexagon and a bond along each edge.

The C₆₀ molecule has two bond lengths. The 6:6 ring bonds (between two hexagons) can be considered "double bonds" and are shorter than the 6:5 bonds (between a hexagon and a pentagon).