The selenide iodides are chemical compounds that contain both selenide ions (Se<sup>2âÂÂ</sup>) and iodide ions (I<sup>âÂÂ</sup>) and one or metal atoms. They are in the class of mixed anion compounds or chalcogenide halides.
Some related compounds do not actually contain a selenide ion, instead containing an iodoselenium cation. These cations include SeI<sub>3</sub><sup>+</sup>, Se<sub>2</sub>I<sub>4</sub><sup>2+</sup>, Se<sub>6</sub>I<sub>2</sub><sup>2+</sup>, and polymeric Se<sub>6</sub>I<sup>+</sup>.