Note 40 — Chapter XI · THE HALOGENS: CHLORINE, BROMINE, IODINE, AND FLUORINE
George Kamensky translation
By analogy with nitric peroxide it might be expected that at low temperatures a doubling of the molecule into Cl2O4 would take place, as the reactions of ClO2 point to its being a mixed anhydride of HClO2 and HClO3.