Carbide bromide
Carbide bromides are mixed anion compounds containing bromide and carbide anions. Many carbide bromides are cluster compounds, containing on, two or more carbon atoms in a core, surrounded by a layer of metal atoms, encased in a shell of bromide ions. These ions may be shared between clusters to form chains, double chains or layers.[1]
The great majority of these carbide bromide compounds contain rare earth elements. Since these elements have similar properties, similar structures can be made by substituting the elements. R2CBr2 forms a structure with layers of R6C clusters that contain one carbon atom. Each layer has bromide coating the top and bottom. Very similar is R2CBr2 which has layers of R6C2 clusters containing pairs of carbon atoms. This dicarbon is an ethenide (C24−), and contains a double bond. Layers have bromide on both sides, and so they are only weakly held together by van der Waals forces. If these layers are aligned with each other a 1T- form results with a small c measurement on the unit cell. In some compounds the layers are not quite aligned, but repeat after three layers giving a 3R form, with a larger c unit cell height. Where the layers align, the crystal system is trigonal. But if the layers never quite align at any height, a monoclinic crystal results. The C2 unit sits at an angle to the layers, and thus reduces symmetry compared to compounds with single carbon atoms in the cluster.[1]
In R2CBr there are layers of R6C that share bromide between layers.[1]
List
formula | system | space group | unit cell | volume | density | comment | reference |
---|---|---|---|---|---|---|---|
Sc7CBr12 | trigonal | R3 | a=13.628, c=9.203 | 4.33 | [2] | ||
Y2CBr2 | trigonal | R3m | a=3.7545, c=29.125 | 4.90 | bronze | [2] | |
Y2C2Br2 | monoclinic | C12/m1 | a=6.953, b=3.764, c=9.938, β=99.98 | 3.85 | superconductor Tc=5.04K | [2][3] | |
Y2C0.7Br2 | trigonal | P3m1 | a=3.73 c=9.864 | 4.83 | grey | [2] | |
Y10Br18(C2)2 | monoclinic | P21/n | a=9.729 b=16.323 c=13.229 β =121.131° Z=24 | 1798.3 | black | [4] | |
Na0.23Y2C2Br2 | monoclinic | C2/m | a=7.061, b=3.724, c=10.464, β=92.96 | 4.43 | copper red | [5] | |
Zr6CBr14 | orthorhombic | Cmce | a=14.69 b=13.229 c=11.991 | [2] | |||
NaZr6CBr14 | orthorhombic | Cmca | a=14.6876, b=13.2266, c=11.9864 | [5] | |||
K4Zr6Br18C | triclinic | P1 | a=10.114, b=10.283, c=10.374, α=118.54, β=99.98, γ=104.08, Z=1 | [6] | |||
RbZr6CBr14 | orthorhombic | Cmca | a=14.719, b=13.287, c=12.043 | [5] | |||
Cs2Zr6Br10C | trigonal | R3c | a=13.0862 c=35.823 Z=6 | 5312.8 | [7] | ||
CsZr6Br9C | trigonal | R3c | a=13.1031 c=35.800 Z=6 | 5321.5 | [7] | ||
Cs3Zr6Br15C | trigonal | R3c | a=13.116 c=35.980 Z=6 | [7] | |||
Cs4Zr6Br15C | trigonal | R3c | a=13.098 c=35.756 Z=6 | 5312 | [7] | ||
La2C2Br | monoclinic | C12/c1 | a=15.313, b=4.193, c=6.842, β=100.53,90 | 5.87 | [8] | ||
La3CBr5 | monoclinic | C12/c1 | a=14.234, b=10.858, c=14.588, β =106.8 | 5.10 | yellow | [8] | |
La3C2Br3 | orthorhombic | C2221 | a=11.533, b=17.0698, c=17.054 | 5.38 | bronze | [8] | |
La4C2Br5 | orthorhombic | Immm | a = 3.9950, b = 8.277, c = 18.101 | 5.43 | black | [9] | |
La5C2Br9 | orthorhombic | Pnma | a=11.309, b=9.9477, c=16.4911 | 5.15 | red | [2] | |
La5C6Br3 | monoclinic | C12/m1 | a=22.809, b=3.9855, c=16.599, β=123.32 | 5.30 | bronze | [2] | |
La6C2Br9 | monoclinic | C2/c | a=14,234 b=10.858 c=14.588 β=106.80 Z=4 | 2158.4 | 4.85 | yellow insulator | [10] |
La10(C2)6Br6 | monoclinic | C2/m | a = 22.809, b = 3.9855, c = 16.599, β = 123.32° Z=2 | 1260.9 | 5.301 | bronze; air sensitive | [11] |
La3Br2C2B | Pnma | f =15.323, b = 3.973, c =11.567 | black | [12] | |||
Ce2C2Br | monoclinic | C2/c | a = 15.120, b = 4.179, c = 6.743, β = 101.09 ° | [13] | |||
Ce4CBr5 | monoclinic | C2/m | a = 18.306, b = 3.9735, c = 8.378, β=104.91° | [14] | |||
Ce4C1.5Br5 | monoclinic | C2/m | a = 18.996, b = 3.9310, c = 8.282, β = 106.74° | [14] | |||
Ce4C2Br5 | orthorhombic | Immm | a = 3.9835, b = 8.186, c = 18.017 | 5.54 | violet | [9] | |
Ce4Br3C4 | triclinic | P 1 | a = 4.227, b = 11.034, c = 11.268, α = 77.15°, β = 90.13° and γ = 84.42° | [15] | |||
Ce10(C2)6Br6 | monoclinic | C2/m | a = 22.483, b = 3.9253, c = 16.375, β = 123.15° Z=2 | 1209.9 | 5.558 | bronze; air sensitive | [11] |
Ce6Br3C3B2 | monoclinic | P21/m | a = 8.602, b = 3.829, c = 10.220, β = 112.53 | black | [12] | ||
Pr2CBr | hexagonal | P63/mmc | a=3.8071, c=14.7787 | 6.69 | black | [2] | |
Pr2C2Br | monoclinic | C12/c1 | a=15.054, b=4.139, c=6.713, β=101.08 | 6.24 | [2] | ||
Pr3CBr3 | cubic | I4131 | a=11.61 | 5.73 | [2] | ||
Pr3CBr5 | triclinic | P1 | a=7.571, b=9.004, c=9.062, α=108.57, β=97.77, γ=106.28 | 5.09 | black | [2] | |
Pr4C1.3Br5 | monoclinic | C2/m | a = 18.467, b = 3.911, c = 8.258, β = 105.25° | [14] | |||
Pr4C1.5Br5 | monoclinic | C2/m | a = 19.044, b = 3.9368, c = 8.254, β = 106.48° | [14] | |||
Pr5C2Br8 | triclinic | P1 | a=9.096, b=12.185, c=16.688, α=79.57, β=89.86, γ=84.38 | 5.02 | black | [2] | |
Pr5C2Br9 | monoclinic | P21/n | a = 10.069; b = 18.861; c = 10.459; β = 108.130° Z = 4 | 5.09 | dark red | [2] | |
Pr5C6Br3 | monoclinic | C12/m1 | a=22.36, b=3.895, c=16.269, β=90,123.44 | 5,71 | [2] | ||
Pr6C2Br10 | triclinic | P1 | a=7.571 b=9.004 c=9.062 α=108.57° β=97.77° γ=106.28° Z=1 | 544.8 | 5.09 | black | [16] |
Pr7C3Br10 | a=9.054, b=11.1265, c=13.352, α=79.641, β=72.57, γ=64.67 | 5.22 | black | [2] | |||
Pr10C4Br15 | triclinic | P1 | a=9.098 b=10.127 c=10.965 α=70.38° β=66.31° γ=70.84° Z=1 | 849.3 | 5.19 | silver | [16] |
Pr10(C2)2Br16 | triclinic | P1 | a = 9.096, b = 12.185, c = 16.688, α = 79.57°, β = 89.86°, γ = 84.38° | metallic black | [17] | ||
Pr10(C2)6Br6 | monoclinic | C2/m | a = 22.36, b = 3.895, c = 16.269, β = 123.44° Z=2 | bronze; air sensitive | [11] | ||
Pr14C6Br20 | triclinic | P1 | a=9.098 b=10.935 c=13.352 α=86.27° β=75.57° γ=66.88° Z=1 | 1157.8 | 5.23 | black | [16] |
Pr6C2Cl5Br5 | monoclinic | C2/c | a = 13.689(1) Å, b = 10.383(1) Å, c = 14.089(1) Å, β = 106.49(1)° | yellow to green | [18] | ||
Gd2CBr | hexagonal | P63/mmc | a=3.7858, c=14.209 | 7.65 | dark grey | [8] | |
Gd2Br2C | trigonal | P3m1 | a=3.8209, c=9.824 | black | [19] | ||
3s-Gd2C2Br2 | monoclinic | C2/m | a = 7.066, b = 3.827, c = 9.967, β = 99.95° | 5.69 | black; contains C24− | [20][21][22] | |
Gd2C2Br2 | monoclinic | C2/m | a=7.025, b=3.8361, c=9.868, β =94.47 | 6.24 | gold | [8] | |
Gd4C2Br3 | orthorhombic | Pnma | a = 10.844, b = 3.730, c = 20.361 | 6.58 | bronze | [23] | |
Gd10C4Br18 | monoclinic | P21/n | a=9.7406 b=16.4817 c=11.8604 β =104.394° Z=24 | contains C24− | [4] | ||
Gd10(C2)6Br6 | monoclinic | C2/m | a = 21.507, b = 3.7193, c = 15.331, β = 123.34° Z=2 | 1024.5 | 6.254 | bronze; air sensitive | [11] |
Gd4Br3C2B | monoclinic | P21/m | a=9.547, b=3.693, c=12.44,5, β=106.68 | black | [12] | ||
K2[Gd10(C2)2]Br19 | orthorhombic | Pbcn | a=12.751, b=23.17, c=14.423 | 5.01 | black | [24] | |
K2[Gd10(C2)2]Br20 | orthorhombic | Pbca | a=1.2751, b=2.317, c=1.4423 | 4.70 | black | [24] | |
Rb2[Gd10(C2)2]Br19 | orthorhombic | Pbcn | a=1.2737, b=2.325, c=1.4412 | 5.15 | black | [24] | |
Cs2[Gd10(C2)2]Br19 | orthorhombic | [24] | |||||
TbCBr | monolinic | C12/m1 | a=7.015, b=3.801, c=9.948, β=100.05 | 6.28 | [2] | ||
Tb2CBr | hexagonal | P63/mmc | a=3.6915, c=14.043 | 8.21 | [2] | ||
Tb2CBrH | hexagonal | P63mc | a=3.7376, c=14.315 | 7.88 | [5] | ||
Tb4C2Br3 | orthorhombic | Pnma | a = 10.743, b = 3.706, c = 20.194 | 7.31 | bronze | [23] | |
Tb10Br18(C2)2 | monolinic | P121/c1 | a=9.7562 b=16.4254 c=13.3043 β =120.675° | 1833.7 | 5.57 | dark red | [4][2] |
Rb2[Tb10(C2)2]Br19 | orthorhombic | a=1.2664, b=2.3105, c=1.4303 | black | [24] | |||
Dy10Br18(C2)2 | monolinic | P21/c | a = 9.740 b = 16.340 c = 13.247 β = 120.869° Z = 2 | 1809.6 | black | [25] | |
Ho10Br18(C2)2 | monolinic | P21/n | a=9.6838 b=16.2436 c=11.6374 β =104.427° Z=24 | 1772.8 | [4] | ||
[Er10(C2)2]Br18 | monoclinic | P21/n | a = 9.718, b = 16.234, c = 11.638, β = 104.00°; Z = 2 | 5.89 | black | [26] | |
Lu2CBr2 | trigonal | R3m | a= 3.6663, c=28.799 | 7.75 | gold | [2] | |
La0.9Lu0.1CBr | monoclinic | C2/m | a=7.434, b=4.0568, c=10.046, β=93.7 | 5.15 | [5] | ||
W30C2(Cl,Br)68 | triclinic | P1 | a = 12.003, b = 14.862, c = 15.792, α = 88.75°, β = 68.85°, γ = 71.19° Z=1 | 2472.9 | 6.35 | black | [27] |
Th6CBr15 | orthorhombic | Cmce | a=15.764, b=14.16, c=13.124 | 5.72 | green | [28] | |
Y0.8Th0.2CBr | monoclinic | C2/m | a=7.061, b=3.776, c=9.983, β=100.36 | 5.31 | [5] |
References
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HBr | He | ||||||||||||||||||||
LiBr | BeBr2 | BBr3 +BO3 | CBr4 +C | NBr3 BrN3 NH4Br NOBr +N | Br2O BrO2 Br2O3 Br2O5 | BrF BrF3 BrF5 | Ne | ||||||||||||||
NaBr | MgBr2 | AlBr AlBr3 | SiBr4 | PBr3 PBr5 PBr7 +P | S2Br2 SBr2 | BrCl | Ar | ||||||||||||||
KBr | CaBr2 | ScBr3 | TiBr2 TiBr3 TiBr4 | VBr2 VBr3 | CrBr2 CrBr3 CrBr4 | MnBr2 | FeBr2 FeBr3 | CoBr2 | NiBr2 NiBr42− | CuBr CuBr2 | ZnBr2 | GaBr3 | GeBr2 GeBr4 | AsBr3 +As +AsO3 | SeBr2 SeBr4 | Br2 | Kr | ||||
RbBr | SrBr2 | YBr3 | ZrBr2 ZrBr3 ZrBr4 | NbBr5 | MoBr2 MoBr3 MoBr4 | TcBr3 TcBr4 | RuBr3 | RhBr3 | PdBr2 | AgBr | CdBr2 | InBr InBr3 | SnBr2 SnBr4 | SbBr3 +Sb -Sb | Te2Br TeBr4 +Te | IBr IBr3 | XeBr2 | ||||
CsBr | BaBr2 | * | LuBr3 | HfBr4 | TaBr5 | WBr5 WBr6 | ReBr3 | OsBr3 OsBr4 | IrBr3 IrBr 4 | PtBr2 PtBr4 | AuBr AuBr3 | Hg2Br2 HgBr2 | TlBr | PbBr2 | BiBr3 | PoBr2 PoBr4 | AtBr | Rn | |||
FrBr | RaBr2 | ** | Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |||
* | LaBr3 | CeBr3 | PrBr3 | NdBr2 NdBr3 | PmBr3 | SmBr2 SmBr3 | EuBr2 EuBr3 | GdBr3 | TbBr3 | DyBr3 | HoBr3 | ErBr3 | TmBr2 TmBr3 | YbBr2 YbBr3 | |||||||
** | AcBr3 | ThBr4 | PaBr4 PaBr5 | UBr4 UBr5 | NpBr3 NpBr4 | PuBr3 | AmBr2 AmBr3 | CmBr3 | BkBr3 | CfBr3 | EsBr2 EsBr3 | Fm | Md | No |