Carbide iodide

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.
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	P	a=10.793, b=10.803, c=13.959, α=87.8, β=73.04, γ=60.8		4,76	black
Sc₄C₂I₆	triclinic	P	a=10.803 b=13.959 c=10.793 α=106.96° β=119.20° γ=87.80° Z=4			linear chains
Sc₆C₂I₁₁	triclinic	P	a=10.046 b=14.152 c=9.030 α=104.36° β=110.45° γ=89.27° Z=2		4.83	black
Sc₇CI₁₂	trigonal	R3	a=14.717 c=9.847 Z=3		4.99	dark purple; dissolves in N,''N-dimethylacetamide
Sc₂₄C₁₀I₃₀	trigonal	Pa	a=25.5182, c=25.5182		4.00	black; supertetrahedron of C₁₀
Y₂C₂I₂	monoclinic	C''12/m1	a=7174, b=3.866, c=10.412 β=92.98,		5.25	bronze; superconductor Tc=9.97K
Y₂I₂C	trigonal	P'm1	a=3.922 c=10.404		5.32	olive green
Y₄I₅C	monoclinc	C2/m	a=18.479 b=3.947 c=8.472 β=103.22°		5.53	dark red; chains
Y₅C₂I₉	monoclinic	C12/c1	a=18.479, b=3947, c=8472, β=103.22°		4.97	black
Y₆C₂I₇	monoclinc	C2/m	a=21.557 b=3.909 c=12.374 β=123.55°		5.53	black; twin chain
Y₁₀C₂I₁₃	monoclinc	C2/m	a=21.317 b=3.95 c=19.889 β=97.40° Z=2			black
Y₁₉C₆I₃₄	triclinic	P	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
Y₁₀C₂I₁₃	monoclinic	C12/m1	a=21.317, b=3.957, c19.899, β=97.4°		5.11	black
Y₁₉C₆I₃₄	triclinic	P	a=93683, b=10.341, c=22.173, α=79.104°, β=88.175°, γ=69.277°		5.12	black
Y₁₆B₄C₈I₁₉	triclinic	P	a=12.311, b=13.996, c=19.695, α=74.96, β=89.51, γ=67.03		4.40	blue
Y₂₁B₇C₁₄I₁₈	triclinic	P	a=10.66, b=15.546, c=18.416, α=82.49, β=85.01, γ=82.92 Z=2	2995	4.87
Y₆C₂I₉N	hexagonal	P6	a=20.275, c=13.025		4.91	brown
Y₇C₂I₁₂N	triclinic	P	a=9.7124, b=10.3038, c=16.7358, α=101.366, β=92.758, γ=112.799		4.84	olive green
Y₇C₃I₆O	orthorhombic	Pmma	a=22.494, b=3.837, c=10.791		5.12	bronze
I₈	orthorhombic	Pmmn	a = 29.127, b = 3.8417, c = 10.80.29, Z = 2		5.16	black
Y₁₆C₇I₁₄O₂	monoclinic	C2/m	a=51.6, b=3.84, c=10.8, β=93		5.15
YCI_0.75l_0.25C	monoclinic	C2/m	a=7.127, b=3.839, c=10.441, β=93.84		4.78
YI_0.75CBr_0.25	monoclinic	C2/m	a=7.131, b=3.847, c=10.358, β=93.73		5.06
Zr₆CI₁₂	trigonal	R	a=14.508, c=10.007		5.69
Zr₆CI₁₄	orthorhombic	Cmce	a=15.69, b=14.218, c=12.808		5.43
K_0.58Zr₆CI₁₄	orthorhombic	Cmca	a=15.727, b=14.278, c=12798		5.54
RbZr₆I₁₄C	orthorhombic	Cmca	a=15.768, b=14.296, c=12.849		5.55
CsY₁₀C₄I₁₈	triclinic	P	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
Cs₂Zr₇I₁₈C	trigonal	R'c	a=10.744, c=29.409		5.42
CsZr₆I₁₄C	orthorhombic	Cmca	a=15.803, b=14.305, c=12.934		5.61
Cs₂Zr₇I₁₈C	trigonal	R	a = 10.744, c = 29.409 Z=3		4.99	black
LaIC	monoclinic	C12/m1	a=7.619, b=4.1252, c=10.7513, β=93.143		5.47	bronze
LaIC	monoclinic	C12/m1	a=7.6132, b=4.1324, c=10.859, β=100.835		5.50	bronze
La₃I₅C	triclinic	P	a=7.955, b=9.687, c=9.728, α=107.81, β=97.34, γ=105.56		5.28	violet
La₃C2I₃	orthorhombic	C222₁	a=12.026 b=17.739 c=17.735		5.77	black
La₄C_1.5I₅	monoclinic	C2/m	a = 19.849, b = 4.1410, c = 8.956, β = 103.86°		5.62	metallic grey
La₄C₂I₅	orthorhombic	Immm	a = 19.907, b = 4.1482, c = 8.963, β = 104.36°
La₅C₂I₉	orthorhombic	Pbca	a = 8.025, b = 16.887, c = 35.886 Z=8	4863	5.08	>850° metallic green
La₅C₂I₉	triclinic	P	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
La₆I₁₀	triclinic	P	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
La₇C₃I₁₀	triclinic	P	a=9.761, b=11.79, c=14.055, α=79.6, β=71.49, γ=65.79		5.42	greenish black
La₁₀C₄I₁₅	triclinic	P	a=9.747, b=10.655, c=11.736, α=93.68, β=114.44, γ=109.28		5.45	dark red
La₁₀I₁₅₂	triclinic	P	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
La₁₂I₁₇₃	monoclinic	C12/c1	a= 19.927, b= 12.636, c = 19.399, β = 90.24°, Ζ = 4	4884.6	5.30	black
La₁₄₃I₂₀	triclinic	P	a = 9.761, b = 11.790, c = 14.055, α = 79.60°, β = 71.49°, γ = 65.79°			greenish black
La₄B₂I₅C	monoclinic		a=23.303, b=4.299, c=18.991, β=126.22		5.30	black
La₉B₃C₆I₅	orthorhombic		a=3.9481, b=33.857, c=8.218		6.01
La₄I₆CN	tetragonal		a=13.953 c=9.811		4.67	olive green
LaCI_0.75l_0.25C	monoclinic	C2/m	a=7.5764, b=4.0758, c=10.7266, β=93.384		5.12	bronze
LaI_0.75CBr_0.25	monoclinic	C2/m	a=75857, b=4.0981, c=10.6782, β=93.272		5.33	bronze
Ce₃I₅C	triclinic	P	a=7.875, b=9.588, c=9.648, α=107.69, β=97.24, γ=105.32		5.43	violet
Ce₅C₂I₉	orthorhombic	Pbca	a = 7.9284, b = 16.714, c = 35.530		5.27	red
Ce₆I₁₀C₂	triclinic	P	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
Ce₇C₃I₁₀	triclinic	P	a=9.688, b=11.67, c=13.932, α=80.16, β=71.81, γ=65.88		5.57	greenish black
Ce₁₂C₆I₁₇	monoclinic	C12/c1	a=19.731, b=12.495, c=19.182, β=90.36		5.49	black; chains
Ce₁₄₃I₂₀	triclinic	P	a = 9.688, b = 11.670, c = 13.932, α = 80.16°, β = 71.81°, γ = 65.88°			greenish back; semiconductor
Ce₄B₂I₅C	monoclinic		a=23.194, b=4.29, c=18.822, β=126.5		5.42	black
Ce₈I₆₂
Ce₄I₆CN	tetragonal	P4₂/mnm	a = 13.877, c = 9.665 Z=4	1861.3	4.810	brown
Ce₆I₉C₂N	hexagonal	P6/m	a = 41.774, c = 13.719 Z=32	20734	5.179	black; moisture sensitive
Ce₆I₉C₂N	hexagonal	P6/m	a = 20.958, c = 13.793 Z=8	5246	5.117	black
PrI₁₂						black
Pr₇C₃I₁₀	triclinic	P	a=9663, b=11.619, c=13.866, α=80.31, β=71.79, γ=65.9		5.64	black
Pr₁₂₃I₁₇	monoclinic	C2/c	a=19.610, b=12.406, c=19.062, β=90.45°		5.62	metallic grey
Nd₂C₂I₂	monoclinic	C2/m				layered
Nd₁₂₃I₁₇	monoclinic	C2/c	a=19.574, b=112.393, c=19.003, β=90.41°		5.71	black
RbI₁₂	triclinic	P	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
Cs₂I₁₂	triclinic	P	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
Cs₄I₁₃	tetragonal	I4₁/amd	a = 18.049; c = 12.595		4.94	blue-black with brassy lustre
Gd₂IC	hexagonal	P6₃/mmc	a=3.801, c=14.792		8.14
Gd₃I₃C	monoclinic	P12₁/m1	a=8.658, b=3.926, c=11.735, β=92.26		7.20	bronze; twin chains
Gd₄I₅C	monoclinic	C2/m	a=18.587 b=3.978 c=8.561 β=103.3			chains
Gd₆C₂I₇	monoclinic	C2/m	a=21.767 b=3.947 c=12.459 β=123.6			twin chains
Gd₇I₁₂C	trigonal	R	a=15.288 c=10.291
Gd₁₀C₄I₁₆	triclinic	P	a=10.463 b=16.945 c=11.220 α=99.16 β=92.68 γ=88.06		6.18	black
Gd₁₂₃I₁₇	monoclinic	C2/c	a = 19.297, b = 12.201, c = 18.635, β = 90.37°		6.13	black; Gd₆ octahedra containing C₂
Gd₄I₆CN	tetragonal		a=13.578 c=9.313		5.48	brown red; air sensitive
Gd₄I₆CN	hexagonal		a=40.806 c=9.232		5.65	brown red
Gd₁₉₃I₃₄	triclinic	P	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
₆	tetragonal	P4/mbm	a = 13.475, c = 12.125, Z = 2			black
Gd₆C₃I_4.56Cl_4.44	tetragonal	P4/mbm	a=13.475, c=12.125		5.18	black
Tb₂IC	hexagonal	P6₃/mmc	a=3.7707, c=14.66		8.40
Tb₂C₂I₂	monoclinic	C2/m				layered
Dy₂I₃C	orthorhombic	Pnnm	a=13.622, b=14.335, c=8.396		5.82
Dy₅C₂I₉	monoclinic	P12₁/c1	a=10.47, b=17.152, c=13.983, β=121.14		6.12	black
Dy₇C₂I₁₂	trigonal	R	a=15.233, c=10.649		6.25	black
Dy₁₂₃I₁₇	monoclinic	C2/c	a=19.149, b=12.069, c=18.595, β=90.54		6.46	black
I₁₈	hexagonal	P6/m	a = 20.2418, c = 12.9921, Z = 8	4610.1	6.22	black
I₂₄	triclinic	P	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
Ho₇C₂I₁₂N	triclinic	P	a=9.688, b=10.287, c=16.678, α=101.31, β=92.78, γ=112.8		6.06	brown red
I₈	orthorhombic	Pmmn	a=3.8157, b=28.867, c=10.748		7.19
Er₄I₅C	monoclinic	C2''m	a=18.521 b=4.015 c=8.478 β=103.07
Er₆C₂I₇	monoclinic	C''2/m	a=21.375 b=3.869 c=12.319 β=123.50			twin chains
I₈	orthorhombic	Pmmn	a=3.8037, b=28.818, c=10.7381		7.29
CsI₁₂	trigonal	R	a=11.120 c=20.638 Z=3	443.71	6.02	black
l₂₄	triclinic	P	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
CsEr₁₀₂I₁₈	triclinic	P	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
I₈	orthorhombic	Pmmn	a=3.7575, b=28.333, c=10.6377		7.78