Carbide iodides are mixed anion compounds containing iodide and carbide anions. Many carbide iodides are cluster compounds, containing one, two or more carbon atoms in a core, surrounded by a layer of metal atoms, and encased in a shell of iodide ions. These ions may be shared between clusters to form chains, double chains or layers.

The metal in carbide iodides is most often a rare earth element. Similar formulas tend to have similar structures. Where R is a rare earth element: R12C6I17 contains chains of R6 octahedra with a C26− core and a shell of iodide. R4I5C contains similar chains, but with a single C4− carbide atom. Double chain structures with single carbon atom cores include R6I7C2 and R3I3C. Layers of joined octahedra include R2I2C2 with an ethanide C24− core; R2I2C and R2IC with one carbide per octahedron.[1]

Related compounds include carbide chlorides, and carbide bromides. Carbon may be substituted by hydrogen, boron or nitrogen in the core of cluster compounds.

This list does not include cyanides, carbonyls, cyanamides or carbido borates, where carbon has bonds to other non-metals. However, there are carbide iodides that also contain nitride, oxide or other halides.

List

Do not confuse Cl for chlorine, and CI for carbon and iodine.

formula system space group unit cell volume density comment reference
Sc2I3C triclinic P1 a=10.793, b=10.803, c=13.959, α=87.8, β=73.04, γ=60.8 4,76 black [2]
Sc4C2I6 triclinic P1 a=10.803 b=13.959 c=10.793 α=106.96° β=119.20° γ=87.80° Z=4 linear chains [3]
Sc6C2I11 triclinic P1 a=10.046 b=14.152 c=9.030 α=104.36° β=110.45° γ=89.27° Z=2 4.83 black [3]
Sc7CI12 trigonal R3 a=14.717 c=9.847 Z=3 4.99 dark purple; dissolves in N,N-dimethylacetamide [4][5]
Sc24C10I30 trigonal Pa3 a=25.5182, c=25.5182 4.00 black; supertetrahedron of C10 [6]
Y2C2I2 monoclinic C12/m1 a=7174, b=3.866, c=10.412 β=92.98, 5.25 bronze; superconductor Tc=9.97K [2][7]
Y2I2C trigonal P3m1 a=3.922 c=10.404 5.32 olive green [2]
Y4I5C monoclinc C2/m a=18.479 b=3.947 c=8.472 β=103.22° 5.53 dark red; chains [8]
Y5C2I9 monoclinic C12/c1 a=18.479, b=3947, c=8472, β=103.22° 4.97 black [2]
Y6C2I7 monoclinc C2/m a=21.557 b=3.909 c=12.374 β=123.55° 5.53 black; twin chain [8][9]
Y10C2I13 monoclinc C2/m a=21.317 b=3.95 c=19.889 β=97.40° Z=2 black [9]
Y19C6I34 triclinic P1 a=9.3683,b=10.341, c=22.173, α=79.104, β=88.175, γ=69.277 Z=1 1970.8 5.12 black [2]
Y10C2I13 monoclinic C12/m1 a=21.317, b=3.957, c19.899, β=97.4° 5.11 black [2]
Y19C6I34 triclinic P1 a=93683, b=10.341, c=22.173, α=79.104°, β=88.175°, γ=69.277° 5.12 black [2]
Y16B4C8I19 triclinic P1 a=12.311, b=13.996, c=19.695, α=74.96, β=89.51, γ=67.03 4.40 blue [10]
Y21B7C14I18 triclinic P1 a=10.66, b=15.546, c=18.416, α=82.49, β=85.01, γ=82.92 Z=2 2995 4.87 [10][11]
Y6C2I9N hexagonal P6 a=20.275, c=13.025 4.91 brown [12]
Y7C2I12N triclinic P1 a=9.7124, b=10.3038, c=16.7358, α=101.366, β=92.758, γ=112.799 4.84 olive green [12]
Y7C3I6O orthorhombic Pmma a=22.494, b=3.837, c=10.791 5.12 bronze [12]
[Y9C4O]I8 orthorhombic Pmmn a = 29.127, b = 3.8417, c = 10.80.29, Z = 2 5.16 black [13][14]
Y16C7I14O2 monoclinic C2/m a=51.6, b=3.84, c=10.8, β=93 5.15 [12]
YCI0.75l0.25C monoclinic C2/m a=7.127, b=3.839, c=10.441, β=93.84 4.78 [15]
YI0.75CBr0.25 monoclinic C2/m a=7.131, b=3.847, c=10.358, β=93.73 5.06 [16]
Zr6CI12 trigonal R3 a=14.508, c=10.007 5.69 [2]
Zr6CI14 orthorhombic Cmce a=15.69, b=14.218, c=12.808 5.43 [2]
K0.58Zr6CI14 orthorhombic Cmca a=15.727, b=14.278, c=12798 5.54 [12]
RbZr6I14C orthorhombic Cmca a=15.768, b=14.296, c=12.849 5.55 [12]
CsY10C4I18 triclinic P1 a=11.138, b=11.201, c=11.325, α=66.92, β=87.26, γ=60.87 Z=1 1117.2 4.99 black [17]
Cs2Zr7I18C trigonal R3c a=10.744, c=29.409 5.42 [18]
CsZr6I14C orthorhombic Cmca a=15.803, b=14.305, c=12.934 5.61 [18]
Cs2Zr7I18C trigonal R3 a = 10.744, c = 29.409 Z=3 4.99 black [19]
LaIC monoclinic C12/m1 a=7.619, b=4.1252, c=10.7513, β=93.143 5.47 bronze [20]
LaIC monoclinic C12/m1 a=7.6132, b=4.1324, c=10.859, β=100.835 5.50 bronze [20]
La3I5C triclinic P1 a=7.955, b=9.687, c=9.728, α=107.81, β=97.34, γ=105.56 5.28 violet [2]
La3C2I3 orthorhombic C2221 a=12.026 b=17.739 c=17.735 5.77 black [2]
La4C1.5I5 monoclinic C2/m a = 19.849, b = 4.1410, c = 8.956, β = 103.86° 5.62 metallic grey [21]
La4C2I5 orthorhombic Immm a = 19.907, b = 4.1482, c = 8.963, β = 104.36° [21]
La5C2I9 orthorhombic Pbca a = 8.025, b = 16.887, c = 35.886 Z=8 4863 5.08 >850° metallic green [22]
La5C2I9 triclinic P1 a = 8.006, b = 10.088, c = 14.383, α = 79.34°, β = 80.75° and γ = 85.07° Z=2 1124.9 5.494 <800 °C; dark red; air sensitive [22][23]
La6I10(C2) triclinic P1 a = 9.687, b = 9.728, c = 7.955, α = 97.34°, β = 105.56° and γ = 107.81° Z=1 699.33 5.276 violet; air sensitive [23]
La7C3I10 triclinic P1 a=9.761, b=11.79, c=14.055, α=79.6, β=71.49, γ=65.79 5.42 greenish black [2]
La10C4I15 triclinic P1 a=9.747, b=10.655, c=11.736, α=93.68, β=114.44, γ=109.28 5.45 dark red [20]
La10I15(C2)2 triclinic P1 a = 9.747, b = 10.655, c = 11.736, α = 93.68°, β = 114.44° and γ = 109.28° Z=1 1018.39 5.447 dark red; air sensitive [23]
La12I17(C2)3 monoclinic C12/c1 a= 19.927, b= 12.636, c = 19.399, β = 90.24(1)°, Ζ = 4 4884.6 5.30 black [24]
La14(C2)3I20 triclinic P1 a = 9.761, b = 11.790, c = 14.055, α = 79.60°, β = 71.49°, γ = 65.79° greenish black [25]
La4B2I5C monoclinic a=23.303, b=4.299, c=18.991, β=126.22 5.30 black [26]
La9B3C6I5 orthorhombic a=3.9481, b=33.857, c=8.218 6.01 [10]
La4I6CN tetragonal a=13.953 c=9.811 4.67 olive green [27]
LaCI0.75l0.25C monoclinic C2/m a=7.5764, b=4.0758, c=10.7266, β=93.384 5.12 bronze [15]
LaI0.75CBr0.25 monoclinic C2/m a=75857, b=4.0981, c=10.6782, β=93.272 5.33 bronze [16]
Ce3I5C triclinic P1 a=7.875, b=9.588, c=9.648, α=107.69, β=97.24, γ=105.32 5.43 violet [28]
Ce5C2I9 orthorhombic Pbca a = 7.9284, b = 16.714, c = 35.530 5.27 red [22]
Ce6I10C2 triclinic P1 a=9.588 b=9.648 c=7.875 α = 97.24°, β = 105.32° and γ = 107.69 Z=1 652.3 5.432 violet [23]
Ce7C3I10 triclinic P1 a=9.688, b=11.67, c=13.932, α=80.16, β=71.81, γ=65.88 5.57 greenish black [28]
Ce12C6I17 monoclinic C12/c1 a=19.731, b=12.495, c=19.182, β=90.36 5.49 black; chains [28]
Ce14(C2)3I20 triclinic P1 a = 9.688, b = 11.670, c = 13.932, α = 80.16°, β = 71.81°, γ = 65.88° greenish back; semiconductor [25]
Ce4B2I5C monoclinic a=23.194, b=4.29, c=18.822, β=126.5 5.42 black [26]
Ce8I6(C2)(N)2
Ce4I6CN tetragonal P42/mnm a = 13.877, c = 9.665 Z=4 1861.3 4.810 brown [29]
Ce6I9C2N hexagonal P6/m a = 41.774, c = 13.719 Z=32 20734 5.179 black; moisture sensitive [29]
Ce6I9C2N hexagonal P6/m a = 20.958, c = 13.793 Z=8 5246 5.117 black [29]
Pr{Pr6C}I12 black [30]
Pr7C3I10 triclinic P1 a=9663, b=11.619, c=13.866, α=80.31, β=71.79, γ=65.9 5.64 black [2]
Pr12(C2)3I17 monoclinic C2/c a=19.610, b=12.406, c=19.062, β=90.45° 5.62 metallic grey [2][31]
Nd2C2I2 monoclinic C2/m layered [32]
Nd12(C2)3I17 monoclinic C2/c a=19.574, b=112.393, c=19.003(5) Å, β=90.41° 5.71 black [2][31]
Rb{Pr6C2}I12 triclinic P1 a = 9.601, b = 9.570, c = 10.034, α = 71.74, β = 70.69, γ = 72.38°, Z = 1 805.6 5.11 black [33]
Cs2[Pr6(C2)]I12 triclinic P1 a=9.481, b=9.536, c=10.052; α=71.01; β=84,68, γ=89.37°; Z=1 515.3 5.16 black [34]
Cs4[Pr6(C2)]I13 tetragonal I41/amd a = 18.049; c = 12.595 4.94 blue-black with brassy lustre [35]
Gd2IC hexagonal P63/mmc a=3.801, c=14.792 8.14 [36]
Gd3I3C monoclinic P121/m1 a=8.658, b=3.926, c=11.735, β=92.26 7.20 bronze; twin chains [36]
Gd4I5C monoclinic C2/m a=18.587 b=3.978 c=8.561 β=103.3 chains [37]
Gd6C2I7 monoclinic C2/m a=21.767 b=3.947 c=12.459 β=123.6 twin chains [37]
Gd7I12C trigonal R3 a=15.288 c=10.291 [37]
Gd10C4I16 triclinic P1 a=10.463 b=16.945 c=11.220 α=99.16 β=92.68 γ=88.06 6.18 black [38]
Gd12(C2)3I17 monoclinic C2/c a = 19.297, b = 12.201, c = 18.635, β = 90.37° 6.13 black; Gd6 octahedra containing C2 [39]
Gd4I6CN tetragonal a=13.578 c=9.313 5.48 brown red; air sensitive [27]
Gd4I6CN hexagonal a=40.806 c=9.232 5.65 brown red [27]
Gd19(C2)3I34 triclinic P1 a = 9.4172, b = 10.339, c = 22.371, α = 79.00°, β = 88.32°, γ = 69.25° Z=1 2007.6 6.10 black; air sensitive [40]
[Gd4(C2)](Cl, I)6 tetragonal P4/mbm a = 13.475, c = 12.125, Z = 2 black [41]
Gd6C3I4.56Cl4.44 tetragonal P4/mbm a=13.475, c=12.125 5.18 black [15]
Tb2IC hexagonal P63/mmc a=3.7707, c=14.66 8.40 [2]
Tb2C2I2 monoclinic C2/m layered [42]
Dy2I3C orthorhombic Pnnm a=13.622, b=14.335, c=8.396 5.82 [43]
Dy5C2I9 monoclinic P121/c1 a=10.47, b=17.152, c=13.983, β=121.14 6.12 black [43]
Dy7C2I12 trigonal R3 a=15.233, c=10.649 6.25 black [43]
Dy12(C2)3I17 monoclinic C2/c a=19.149, b=12.069, c=18.595, β=90.54 6.46 black [43][31]
{(C2)2O2Dy12}I18 hexagonal P6/m a = 20.2418, c = 12.9921, Z = 8 4610.1 6.22 black [44]
{(C2)2O2Dy14}I24 triclinic P1 a = 9.730, b = 10.330, c = 16.770, α = 101.42°, β = 92.72°, γ = 112.75°, Z = 2 1509.3 5.94 black [44]
Ho7C2I12N triclinic P1 a=9.688, b=10.287, c=16.678, α=101.31, β=92.78, γ=112.8 6.06 brown red [45]
[Ho9C4O]I8 orthorhombic Pmmn a=3.8157, b=28.867, c=10.748 7.19 [45][14]
Er4I5C monoclinic C2m a=18.521 b=4.015 c=8.478 β=103.07 [37]
Er6C2I7 monoclinic C2/m a=21.375 b=3.869 c=12.319 β=123.50 twin chains [37]
[Er9C4O]I8 orthorhombic Pmmn a=3.8037, b=28.818, c=10.7381 7.29 [46][14]
Cs[Er6C]I12 trigonal R3 a=11.120 c=20.638 Z=3 443.71 6.02 black [47]
[Er14(C2)2(N)2]l24 triclinic P1 a = 9.663, b = 10.276, c = 16.634, α =101.374°, β = 92.85°, γ = 112.83°, Z =2 1477.8 6.14 red brown [48]
CsEr10(C2)2I18 triclinic P1 a=11.052 b=11.120 c=11.229 α=66.01° β=87.14° γ=60.80° Z=1 656.6 6.29 black [47]
[Lu9C4O]I8 orthorhombic Pmmn a=3.7575, b=28.333, c=10.6377 7.78 [12][14]

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