The structure is too small to exhibit a plasmonic activity. A similar comment can be done for Au 5+ 55 (see Figure in Supporting Information). With Au - 147 , bands lying between 3.5 and 4.0 eV start to be characterized by high values of superatomic character and collectivity indexes (see Figure in Supporting Information). Their plasmonic character remains more pronounced at RSX-PBE0 level, pushing us to conclude that a range-separated densityfunctional approximation is more adequate to model such kind of properties.