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organic compounds
The structure of the title compound, C13H10I2O4S2, has been redetermined, with proper treatment of both anomalous dispersion and absorption. The unusual structural features reported in an earlier determination [Stergioudis, Bozopoulos, Kavounis & Rentzeperis (1989). Z. Kristallogr. 189, 57–63] are not reproduced by the present analysis; the structure and conformation of the title compound are now found to be very similar to those of (PhSO2)2CBr2; the molecules are joined into chains along the a direction by very short IO interactions [IO 2.927 (7) Å].