Redetermination of the crystal structure of potassium peroxodisulfate (K2S2O8)

The crystal structure of potassium peroxodisulfate was determined. The crystals are triclinic, a =5.115(1),b =7.034(2), c =5.505(1) å, α =106.32(2),gb =90.18(2), γ =106.12(2)?, V_cell = 181.90(7) å³, space group Pī, Z =1, d_calc =2.468 g/cm ³ [“Syntex P2₁,” λCuK_α, 994 reflections measured in a whole sphere to 2Τ_max =114?, including 496 independent reflections (R_int = 0.0571), R(F) = 0.0391, wR(F²) = 0.0933 for 486 F_hkl > 4Σ(F)]. An absorption correction (Μ = 171.37 cm^?1) was applied taking into account the shape and size of the crystal using data about face indices. The representative of the single crystal was proven by comparing the experimental and calculated diffractograms. The geometrical characteristics of S₂O ₈ ² : S-O 1.645(2), S = 0 1.421(3)-1.429(2), O-O 1.495(5) å, S-O-O 106.2(2)?.