Electronic structure, bonding, and properties of SnmGen (m + n ⩽ 5) clusters: A DFT study

► Binary clusters of tin and germanium up to five atoms are studied by DFT method. ► Geometries of most stable isomers of a maximum of five-atom clusters are optimized. ► Variations of average BE, HOMO-LUMO gaps, IP, EA with the cluster size are explored. ► Relative stabilities are investigated by reactivity descriptors. ► Fragmentation energies are calculated to study the relative strength of the bonds.