Depending on the nature of M+ , the hydrides of the H2Cu11 reactant behave differently. In the case of M=Cu or Ag, they act as regular two-electron ligands yielding [CuH2Cu11{S2P(OiPr)2}6(C≡CPh)3]+ (Cu12H2) or [AgH2Cu14{S2P(OiPr)2}6(C≡CPh)6]+ (AgH2Cu14); in the case of M=Au, they behave as electron donors to form [AuCu11{S2P(OiPr)2}6(C≡CPh)3Cl] (AuCu11). Details of the study are presented by Jean-Yves Saillard, Chen-Wei Liu, and co-workers in their Research Article (e202113266).