Phosphide iodides or iodide phosphides are compounds containing anions composed of iodide (I−) and phosphide (P3−). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the phosphide chlorides, arsenide iodides antimonide iodides and phosphide bromides.
Phosphorus can form clusters or chains in these compounds, so that some are 1-dimensional or fibrous.
Phosphide iodides are often metallic, black or dark red in colour.
List formulasystemspace groupunit cell Åvolumedensitycommentref[Si40P6]I6.5cubicPmna=10.1293 Z=11039.33.412clathrateK4P21IorthorhombicCcmma = 12.853; b = 21.795; c = 9.748 Z = 42730.72.271ruby red;sensitive to airCa2PItrigonalRma=4.30 c=22.173.2yellowCa3PI3cubicI4132a=12.31 Z=83.78colourlessCu2P3I2monoclinicP21ca = 15.343, b = 12.925, c = 15.260, β = 116.38°, Z = 16band gap 0.72 eV; Cu ion conductorCu3P15I2monoclinicP21/na=9.667, b=19.475, c=9.886, β =108.75(2)°, Z=41762.4grey(CuI)3P12monoclinicP21a=12.846 b=13.857 c=9.651 β=109.43 Z=41620.23.866shiny(CuI)2P14monoclinicP21/ca = 9.919, b = 9.718, c = 16.478, β = 105.71°, Z = 41529.03.539(CuI)5P16S(CuI)3P4S4hexagonalP63cma=19.082, c=6.691 Z=62109.9(CuI)8P12monoclinicP121/c1a=15.343, b=12.925, c=15.26, β=116.384.64Ge38P8I8CubicP3na=10.507silvery(CuI)5P16Se(CuI)2P8Se3Pbcma=9.1348 b=12.351 c=13.873 Z=41565.23.673red; melt 408 °C; P8Se3 clusters(CuI)3P4Se4hexagonalP63cma = 19.601, c = 6.7196, Z = 6orangeZn3PI3cubicF2ma=5.9454.87dark grey; dec 300 °C(ZnI2)6ZnSP4S3(ZnI2)6ZnSeP4Se3cubicF3ca=19.5427463.14.325brownRb4P21IorthorhombicCcmma = 13.281; b = 21.868; c = 9.771 Z=42838.12.619dark redSr2P7IcubicP213a=10.25dark red; contains heptaphosphanortricyclaneZr6I14PorthorhombicCmcaAg2P3I2monoclinicAg ion conductor(AgI)2Ag3PS4hexagonalP63mca=7.395 c=12.224 Z=2579.1Ag ion conductorCd2P3ImonoclinicC2/ca=8.255 b=9.304 c=7.514 β =99.66Cd3PI3hexagonalP63mcband gap 2.44 eVCd4P2I3orthorhombicPbcaa=12.890 b=12.725 c=12.654P24−SnIPsoft and flexible; double helix SnI+ and P−; band gap 1.9 eVSn24P19.3I8cubicPmna=10.9554Sn24P19.3BrxI8−xcubicPmnSn24P19.3(2)ClyI8−y (y ≤ 0.8)cubicPmnSn20Zn4P20.8I8cubicPmna=10.883 Z=1Sn17Zn7P22I8cubicPmna=10.8458 Z=1Sn14In10P22I8cubicPmna=11.0450 Z=11347.45.535blackSn14In10P21.2I8P42/ma=24.745, c=11.067, Z=567765.521black[Ge30.5Sn7.7P7.75]I7.88cubicPmna=10.721 Z=1Sn24AsxP19.3−xI8cubicPmna = 10.9358—11.1495Cs0.35Zr6I14PorthorhombicCmcaa=15.934 b=14.287 c=12.939 Z=4blackBa2P7ImonoclinicP21/ma=6.3538 b=6.8990 c=12.0392 β =95.515 Z=2524.933.912orange-yellow; water sensitiveBa3P3I2orthorhombicPnmaa = 17.195, b = 4.624, c = 14.272, Z = 4,Ba5P5I3monoclinicC2/ma = 42.664, b = 4.56.3, c = 9.431, β = 92.20, Z = 4La2PI2trigonalPm1a=4.236 c=10.121 Z=1157.254.95Eu2PIR3ma = 4.445, c = 23.12.6, Z = 3Eu2P7IcubicP213dark red; contains heptaphosphanortricyclane; band gap 1.7 eVAu7P10ItrigonalP1ma=6.180 c=11.122 Z=1Hg9P5I6monoclinica=13.112 b=12.486 c=17.031 β=119.90Hg4ZnPI4monoclinicP21 a = 7.850, b = 12.719, c = 7.861, β = 119.52°, Z = 2like Millon phasesHg7Ag2P8I6monoclinicC12/m1a=13.146 b=11.037 c=8.336 β=102.210 Z=21182.17.386blackHg12Ag41P88I41cubicFma=26.705 Z=4190455.147dark red; air stable; P113− clustersHgAg6P20I2monoclinicP21/ma = 6.718, b = 27.701, c = 7.383, β = 113.98°, Z = 2
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