| Potassium tetranitropalladate(II) was synthesized in one step by mixing palladium acetate and potassium nitrite in water with a yield of 96.5%. A single crystal of the product was cultivated using a solvent evaporation method, and was characterized by X-ray single crystal diffraction analysis. The crystal unit of the compound contains one centrosymmetric [Pd(NO2)4]2- complex anion, two K+ cations and two crystallized water molecules, belongs to triclinic crystal system and P-1 space group. The unit cell parameters are a=6.4953(5) nm, b=7.0134(5) nm, c=7.1473(5) nm, α=118.784(2)°, β=101.050(2)°, γ=98.085(2)°, Z=1. The Pd-N bond lengths are 2.014 and 2.037 nm, ∠N-Pd-N is 91.70(4)°, revealing that Pd2+ is in the center of the planar quadrilateral formed by four N atoms from the nitro groups. The cyclic voltammetry was measured at room temperature, and the reduction peak potential (Ep) was found to be -0.51 V (vs. SCE). |
