Spherical Molecules: Poly-Benzene
In the previous drawings Benzene is shown firstly, which we can see it developed in its specific page.
We also see the main spherical molecules that can be built with benzene structures, also with contributions of tetrahedron structures.
It is shown:
--Caroten (C24) is a simple molecule that is formed by a benzene melecule and six triads of carbon.
--Full-naphthalene (C30), which is composed by a benzene and six tetras.
--Hexa-benzene (C42) composed by seven benzenes, one of those is central.
--Hexa-carotene (C60) that is composed by a central benzene and six carotenes (benzene with a triad in any atom)
--Hexa-naphthalene (C66) composed by a benzene and six naphthalene.
--And for finish, Diamond (Cn).
As we see these are quasi-spherical molecules. Nevertheless by means of multiples benzenes a lot of molecules can be built, which don't keep sphere appearance.
Diamond (Cn). ( Structural drawing in Diamond's Bonds )
Diamond is a special case of molecular carbonic net in which all atoms are connected by both sides (except those of the gem surface).
As you see in the drawings, in all molecules that are exposed (except diamond) alone those of the benzene nucleus and the radial branches have bilateral connection; the other ones have a lateral connection only.
Therefore all they are less dense, less compact and mainly less hard than diamond, because any diamond forms a single molecule while the other compounds of many united molecules consist.
In the diamond the interior connections are of benzene type (double connection for each atom) while the unions among benzenes are carried out by means of single connection.