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 = 7034(2), c = 5.505(1) Angst rom, alpha = 106.32(2), beta = 90.18(2), gamma = 106.12(2)degrees, V-c ell = 181.90(7) Angstrom(3), space group P (1) over bar, Z = 1, d(calc ) = 2.468 g/cm(3) [''Syntex P2(1),'' gamma CuKalpha, 994 reflections m easured in a whole sphere to 2 theta(max) = 114 degrees including 496 independent reflections (R-int = 0.0571), R(F) = 0.0391, wR(F-2) = 0.0 933 for 486 F-hkl > 4 sigma(F)]. An absorption correction (mu = 171.37 cm(-1)) was applied taking into account the shape and size of the cry stal using data about face indices. The representativity of the single crystal was proven by comparing the experimental and calculated diffr actograms. The geometrical characteristics of S2O82-: S-O 1.645(2), S = O 1.421(3)-1.429(2), O-O 1.495(5) Angstrom, S-O-O 106.2(2)degrees.