Arsenide iodides or iodide arsenides are compounds containing anions composed of iodide (I−) and arsenide (As3−). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the arsenide chlorides, arsenide bromides, phosphide iodides, and antimonide iodides.
List formulasystemspace groupunit cell ÅvolumedensitycommentrefCa2AsItrigonalRma=4.397, c = 22.29, Z = 33.76brownCa3AsI3cubicI4132a=12.423.99colourlessCu2P1.8As1.2I2monoclinicP21/ca = 15.477, b = 13.200, c = 15.421, β = 115.406°, Z = 16Cu exchangeable with Ag; band gap 1.2 eVGe38As8I8cubicP3ma=10.611metallic; water and air stableAg2P1.8As1.2I2monoclinicP21/ca = 15.84, b = 13.68, c = 15.58 and β = 117.63° Z=16Sn24As19.3I8cubica=22.179 Z=8blackSn20.5□3.5As22I8cubica=22.1837low thermal conductivitySn24AsxP19.3−xI8 x=0-16cubicPm3na = 10.9358—11.1495Sn19.3Cu4.7As22I8cubicPmna = 11.1736 Z = 11394.46.236clathrate; Zintl; diamagneticSn24–x–δInxAs22–yI8cubicPmna = 11.088 (x = 0) to a = 11.343 (x = 10.7)clathrateLa2AsI2trigonalPm1a=4.3795 c=10.9105.56Hg4AsI5orthorhombicCmcaa=11.927 b=12.128 c=19.776 Z=82859.07.025redHg4As2I3cubicPaa=12.999 Z=821968.06blackHgI2⋅As4S4monoclinicP21/ca=9.433 b=14.986 c=11.624 β=127.72° Z=412994.509orange; dec 212 °CHg5AsS2I3monoclinicC2/ca=13.339 b=8.444 c=13.428 β=118.352 Z=41331.27.599black; dec 150 °CHg3AsSe4IhexagonalP63mca = 7.6902, c = 9.968 Z=2red; air stable[Hg7As4](AgI3)2cubicPaa = 13.138 Z = 4(Hg2As)2(CdI4)monoclinicP21a=7.945, b=12.934, c=8.094, β=116.898°741.7[Hg7As4I3](SnI3)cubicP213a = 13.110, Z = 42253.27.617black
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