Fill time Fullerene

In 2000, Hirsch s 2( +1) rule of aromaticity for spherical compounds [18,46,47] was introduced as the spherical analog of Hiickers 4n + 2 mle. Hirsch s mle is based on the fact that the Ji-electron system of an icosahedral fullerene can be, in a first approximation, considered as a spherical electron gas surrounding the surface of a sphere. The corresponding wave functions of this electron gas are characterized by file angular momentum quantum number 1(1 = 0,1,2,...), with each energy level 2 Z + 1 times degenerated, and thus all jt-sheUs are completely filled when we have 2 ( + 1) electrons. For such reason, spherical species with 2(n +1) Ji-electrons are aromatic, like icosahedral 20, or Cgo ". ... 

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