A tetranuclear gold cluster has been synthesized by the reaction of [Au(PPh3)NO3] with the closo carborane diphosphine 1,2-(PPh2)2-1,2-C2B10H10 in THF, and characterized by elemental analysis, FT-IR, 1H and 13C NMR spectroscopy and X-ray structure determination. The cluster crystallizes in the triclinic Pī, a = 15.118(8) Å, b = 16.057(9) Å, c = 24.284(13) Å, α = 80.822(9)°, β = 79.624(8)°, γ = 81.938(8)°, Z = 2, R 1 = 0.0626, wR 2 = 0.1894. A single crystal structure determination showed that four gold atoms form a tetrahedral framework. Among these four gold atoms, two were chelated by two nido carborane diphosphine [7,8-(PPh2)2-7,8-C2B9H10]− anions coming from the degradation of the initial closo ligand 1,2-(PPh2)2-1,2-C2B10H10, while the other two were ligated to two PPh3 groups. The luminescence of this cluster was also investigated in dichloromethane solution at room temperature.