1,2-Diiodoethane is an organoiodine compound.

[1] 1,2-Diiodoethane can be prepared by the reaction of ethylene with iodine (I2):[2] 1,2-Diiodoethane is most commonly used in organic synthesis in the preparation of samarium(II) iodide or ytterbium(II) iodide in an inert solvent such as THF.

[3] In mass spectroscopy, 1,2-diiodoethane exhibits 5 major peaks, with the base peak showing at 155 m/z, which is the loss of one iodine atom (127 m/z).