Synthesis, structure and photoluminescence of a novel palladium(I) compound: [Pd3(μ3-Cl)2(dppp)3][Pd2(μ2-Cl)3(PPh3)2](PPh3)2

Pd(PPh3)2Cl2 reacts with PdCl2 and 1,3-bis(diphenylphosphine)propane (dppp) in ethanol–DMF–pyridine mixed solvent to yield a novel palladium(I) compound [Pd3(μ3-Cl)2(dppp)3][Pd2(μ2-Cl)3(PPh3)2](PPh3)2. It features an isolated structure based on [Pd3(μ3-Cl)2(dppp)3]+ cations having triangulo-palladium clusters and [Pd2(μ2-Cl)3(PPh3)2]− anions in which the coordination environment of palladium is an unusual tetrahedral geometry. Its photoluminescence is measured.