On golden bond: In both the solid state and in solution, the neutral dinuclear gold(I) complexes [12‐(R3PAu)2CC‐closo‐1‐CB11H11] (R=Me, Et) dimerize to tetranuclear gold(I) clusters held together by aurophilic interactions. For the Et3P complex, the dimer and the monomer exist in equilibrium in solution at 25 °C. In contrast, even at 75 °C only dimers (AuI4 clusters), are observed for the Me3P complex (see structure: C black, B brown, P pink, Au yellow).