The isomers [Mo2Cp2(mu-kappa(1):kappa(1),eta(6)-PR*)(CO)(2)] (1) and [Mo2CP(mu-kappa(1): k(1), eta(5)- PC5H4)(CO)(2)(eta(6)-HR*)] (2) (Cp := eta(5)-C5H5; R* = 2,4,6-(C6H2Bu3)-Bu-t) react with [AuCl(THT)] and with the cation [Au(THT)(2)](+) (THT = tetrahydrothiophene) to give phosphinidene-bridged Mo2Au complexes resulting from the addition of an AuCl or Au(THT)+ electrophile to their multiple P-Mo bonds. Removal of the Cl- or THT ligand from these derivatives causes a dimerization of the trinuclear structures to give the cationic derivative [{AuMo2Cp(mu(3)-kappa(1):kappa(1):kappa(1),eta(5)-PC5H4)(CO)(2)(eta 6-HR*)}(2)](2+), which displays a novel H-shaped metal core held by strong Mo-Au dative bonds [2.768(1) angstrom] and an aurophilic interaction [Au-Au = 3.022(1) angstrom].