Resumen

Using first principle calculations, in-depth bonding and aromaticity pattern of bare anionic nortricyclane, E73− (E = P, As, Sb, and Bi) Zintl clusters have been explored. A detailed topological analysis reveals that every cluster comprises of nine 2c-2e σ-bond with an occupation number of 1.96–1.99 |e|. We find an impressive covalence in the E73− cluster which decreases down the group from P73− to Bi73−. The nucleus independent chemical shift (NICS) foretell about the aromatic property of the Zintl cluster which is also decreasing along the group. In addition, the response with respect to external magnetic field of the nucleus independent shielding tensor was obtained to explore the possible formation of the shielding cone behavior.