  We propose a theoretical investigation in this paper to understand the
bonding and structural properties of neutral Al4Na4 and anion Al4Na3- clusters.
We show that the Al4 species in Al4Na4 and Al4Na3- clusters is a rectangular
planar structure with alternate pi-bonds and hence satisfying the basic
criteria for anti-aromaticity. We prove that the Al4Na4 and Al4Na3- clusters
are metallo-anti-aromatic compounds.
