Die erste Kristallstrukturanalyse einer Iodylverbindung

The First Crystal Structure Analysis of an Iodyl Compound Single crystals of (IO₂)₂S₂O₇ were obtained for the first time by reacting iodic acid and oleum at 195°C. According to the results of a X-ray structure determination (monoclinic, P2₁/a, a = 885.0(2), b = 1037.3(2), c = 915.8(2) pm, β = 94.75(2)°, Z = 4, 1466 diffractometer data, R₁ = 0.033, wR² = 0.063), (IO₂)₂S₂O₇ contains dimeric iodyl cations (IO₂), which are connected by disulfate groups thus forming polymeric strands. Strikingly, the I? O-distances range almost continously from 174 pm (strong intramolecular bonds) to ? 300 pm (van der Waals contacts).