Magic numbers are connected with the number of metal atoms in those thiolate-protected clusters which display an outstanding stability. Such clusters can be synthesized monodispersely and are end products of the etching procedure after an addition of excess thiols does not lead to further metal dissolution. Some important clusters with magic numbers are (SG:Glutathione): Au(SG), Au(SG), Au(SG), Au(SG), Au(SG), Au(SG), Au(SG), Au(SG), and Au(SG).
Au(SCHPh) is also well-known. It was greater than representatives Au(p-MBA) with the para-mercaptobenzoice (para-mercapto-benzoic acid, p-MBA) produced ligand.