By means of the electronic confined space analogy (ECSA), the (4
n+2) π Hückel rule,
as followed by 2D aromatic [
n]annulenes, h
as been connected to the 3D aromatic Wade-Mingos’ rule found for
closo [B
nH
n]
2- clusters. Application of the ESCA method to medium
and large boron clusters allows their cl
assification into different series according to the
n value of the Hückel (4
n+2) π rule (photo credit: Iñaqui Sanjuán Pertusa). More information can be found in the Full Paper by M. Solá, F.
Teixidor et al. on
page 7437 ff.