Arsenide bromide explained

Arsenide bromides or bromide arsenides are compounds containing anions composed of bromide (Br⁻) 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 iodides, phosphide bromides, and antimonide bromides.

List

formula	system	space group	unit cell Å	volume	density	comment	ref
(Ca2−x□x)(As1−xBr1+x) Ca2AsBr	cubic		a=6.05		3.47	yellow, or dark brown	^[1] ^[2]
Ca3AsBr3	cubic	Pm3	a=5.91		3.48	colourless or yellow
Cu6AsS5Br	cubic	F4m	a=9.8763		4.80		^[3] ^[4]
(Ge38As8)^+8⋅8 I^−	cubic	Pm3n	a=10.625		5.71	semiconductor resistivity 1 Ω cm; band gap 0.9 eV; silvery grey	^[5]
I8As21Ge25	cubic	Pmn	a=10.5963 Z=1	1189.77	6.143	colourless	^[6]
Cd2As3Br	monoclinic	C2/c	a = 8.281, b = 9.411, c = 7.993, β = 101.49°, z = 4		5.76	black	^[7] ^[8]
Cd4As2Br3	cubic	Pa	a=12.61		5.51	semiconductor band gap 1.8 eV	^[9]
Cd4PAsBr3	cubic	Pa	a=12.521		5.38		^[10]
Cd4As2I1.5Br1.5	cubic	Pa	a=12.83				^[11]
La3AsBr3	cubic	I4132	a=12.09		5.50		^[12]
Pr3AsBr3	cubic	I4132	a=12.02		5.64
Hg2As3Br	monoclinic	C2/c	a = 8.0914, b = 9.300, c = 8.1084, β = 99.323°, z = 4		7.79	black
Hg4As2Br3	cubic	Pa3	a=12.610 Z=8	2012.4	5.54 7.90	red; dark grey	^[13] ^[14]
Hg19As10Br18	triclinic	P	a = 11.262, b = 11.352, c = 12.309, α = 105.724, β = 105.788, γ = 109.078°	1314.3		dark brown	^[15]
(HgBr2)3(As4S4)2	monoclinic	P21/c	a = 9.593, b = 11.395, c = 13.402, β = 107.27, Z = 2	1399			^[16]
Hg3AsS4Br	hexagonal	P63mc	a = 7.430, c = 9.364 Z=2				^[17]
(Hg6As4)[TiBr<sub>6</sub>]Br	cubic	Pa3	a= 1230.9				^[18]
[Hg<sub>6</sub>As<sub>4</sub>](CrBr6)Br	cubic	Pa	a=12.275			[Hg<sub>6</sub>As<sub>4</sub>]^4+ framework with 2 kinds of cavity; band gap 1.5 eV	^[19]
[Hg<sub>6</sub>As<sub>4</sub>](FeBr6)Hg0.6	cubic	Pa	a=12.332			[Hg<sub>6</sub>As<sub>4</sub>]^4+ framework with 2 kinds of cavity; band gap 1.5 eV
[Hg<sub>6</sub>As<sub>4</sub>](CuBr3)2	monoclinic	I2/a	a = 14.884, b = 9.358, c = 20.413, β=92.88°, Z = 6			dark red	^[20]
[Hg<sub>11</sub>As<sub>4</sub>](GaBr4)4	monoclinic	C2/m					^[21]
Hg3AsSe4Br	hexagonal	P63mc	a = 7.707, c = 9.47 Z=2
(Hg2Cd2As2Br)Br	orthorhombic	Pmma	a = 8.791, b = 4.701, c = 9.779, Z=2	404.2	7.688	dark red	^[22]
(Hg6As4)(CdBr6)	cubic	Pa	a=12.3738 Z=4	1894.6	7.345	red; air stable; band gap 1.94	^[23]
[Hg<sub>6</sub>As<sub>4</sub>][InBr<sub>6</sub>]Br	cubic	Pa	a=12.3511 Z=4	1884.2		dark red	^[24]
[Hg<sub>4</sub>As<sub>2</sub>](InBr3.5As0.5)	Hexagonal	P63/mmc	a = 7.7408, c = 12.535, Z=2	650.47			^[25]
[Hg<sub>6</sub>As<sub>4</sub>Br<sub>3</sub>](SnBr3)	cubic	P213	a=12.383 Z=4				^[26]
[Hg<sub>6</sub>As<sub>4</sub>][YbBr<sub>6</sub>]Br	cubic	Pa	a=12.362 Z=4	1889.1	7.860	dark red	^[27]
Hg9As4Bi2Br12	tetragonal	P43	a=10.865 b=10.865 c=28.357 Z=4	3347.5	6.91	orange	^[28]

Notes and References

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2. Hadenfeldt . Claus . 1976-04-01 . Darstellung und Eigenschaften von Ca 2 AsBr, Sr 2 AsCl und Ca 3 AsBr 3 .: Preparation and Properties of Ca 2 AsBr, Sr 2 AsCl, and Ca 3 AsBr 3 . Zeitschrift für Naturforschung B . en . 31 . 4 . 408–410 . 10.1515/znb-1976-0403 . 95122668 . 1865-7117. free .
3. Nilges . Tom . Pfitzner . Arno . 2005-03-01 . A structural differentiation of quaternary copper argyrodites: Structure — property relations of high temperature ion conductors . Zeitschrift für Kristallographie - Crystalline Materials . en . 220 . 2–3 . 281–294 . 10.1524/zkri.220.2.281.59142 . 2005ZK....220..281N . 56213950 . 2196-7105.
4. Book: Handbook of Inorganic Compounds 2015 . 2015 . 826.
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6. Ayouz . Katia . Kars . Mohammed . Rebbah . Allaoua . Rebbah . Houria . 2009-03-15 . I 8 As 21 Ge 25 . Acta Crystallographica Section E . 65 . 3 . i15 . 10.1107/S1600536809004991 . 1600-5368 . 2968696 . 21582033. 2009AcCrE..65I..15A .
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