Methane is the simplest molecule I know of that takes the shape of a [platonic solid](https://en.wikipedia.org/wiki/Platonic_solid) — in this case, the tetrahedron. Wikipedia has a page on [platonic hydrocarbons](https://en.wikipedia.org/wiki/Platonic_hydrocarbon) that includes molecules with tetrahedron, cube, and dodecahedron shapes. There are lots of molecules that have <A HREF="https://en.wikipedia.org/wiki/Octahedral_molecular_geometry">octahedral geometry</A> (e.g. sulfur hexafluoride). 

Are there any molecules that form an icosahedron? The closest I've found is $\ce{C_60}$, buckminsterfullerene, which takes the form of an Archimedean solid, the truncated icosahedron.

To clarify: I am interested in molecules with atoms positioned at the vertices of platonic solids; whether or not there are direct bonds between those atoms is not relevant.