The selenide iodides are chemical compounds that contain both selenide ions (Se2−) and iodide ions (I−) 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 SeI3+, Se2I42+, Se6I22+, and polymeric Se6I+.

List nameformulaMWsystemspace groupunit cellcell volumedensitypropertiesrefTi4Se9I6triclinicPa = 7.965 b = 10.339 c = 15.692; α = 79.116°, β = 75.861°, γ = 71.437°; Z = 2blackV4O(Se2)4I6·I21866.64tetragonalP42/nbca=11.8384 c=18.689 Z=42619.24.734dark blueCuSe3ItrigonalRma=9.601 V= 872.859αAsSeImonoclinicP2sa=8.855 b=4.194 c=10.341 β=93.74 Z=45.14melt 221 °C dark red metallicβAsSeIcubicF4132a=11.05 Z=165.53dark red metallicAsF6Se6INbSe2I2triclinicPa=6.993 b=7.008 c=7.768 α=89.339° β=66.801° γ=61.284° Z=2299.35.600black; 2D; band gap 1 eVtriniobium selenide heptaiodideNb3SeI7hexagonalP63mc(Nb4Se15I2)I2monoclinicP21/ca=8.8807 b=25.8368 c=11.6222 β=103.437°black; 1D; band gap 0.6 eV[Mo3Se7(TeI3)I2]I1729.54P23/na=10.4969 b=13.029 c=16.567 β =102.921° Z=42208.35.202Pd2SeI3orthorhombicmetallic blackheptasilver(I) tetraseleniogermanate(IV) selenide iodideAg7GeISe5cubicF3ma=10.9864 Z=41326.16.740black; silver ion conductorCdBiSe2ImonoclinicC2/mindium selenide iodideInSeItetragonalI41/a Antimony selenide iodideSbSeIorthorhombicPnmaband gap 1.70 eV n-type semiconductorSbF6Se6ICs3Mo6I6Se2I6Cs3Mo6I7SeI6tribarium tetraselenide diiodideBa3Se4I2monoclinicC2/ca = 15.080 Å, b = 10.400 Å, c = 8.383 Å, β = 103.206°, Z = 4Ta2Se8Itetragonala = 9.59 c = 12.64 Charge-density-wave Weyl semimetal tritantalum selenide heptaiodideTa3SeI7hexagonalP63mcTa4Se9I8WCl6Se6IHg3Se2I2orthorhombicImmaa= 9.7660 b=19.381 c=9.6332 Z=8light redtrimercury arsenic tetraselenide iodideHg3AsSe4I1119.43hexagonalP63mca = 7.6902 c = 9.968 Z = 2510.507.283dark redTl6SeI4tetragonalP4/mnc7.4band-gap 1.6 eV; semiconductor; melt 432 °CBismuth selenide iodideBiSeI414.84orthorhombicPnmaa = 8.697 b = 4.2205 c = 10.574388.17.100band gap 1.3 eV; silverBi2CuSe3IIn2Bi3Se7IInBi2Se4I

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