The group 14 cationic clusters by encapsulation of coinage metals X10M+, with XÂ =Â Ge, Sn, Pb and MÂ =Â Cu, Ag, Au: Enhanced stability of 40 valence electron systems

► The coinage metal encapsulated group 14 cationic clusters X10M+ with X = Ge, Sn, Pb and M = Cu, Ag, Au are magic cluster with high stability and aromaticity. ► The concept of doubly spherical aromaticity, based on the number of 2(N + 1)2 π and σ valence electrons, is proposed to account for the enhanced stability. ► Predictions are in good agreement with experiment for available X10Cu+ clusters.