Antimonide bromide

Antimonide bromides or bromide antimonides are compounds containing anions composed of bromide (Br⁻) and antimonide (Sb³⁻). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the antimonide chlorides, antimonide iodides, arsenide chlorides, arsenide bromides, arsenide iodides, phosphide chlorides, phosphide bromides, and phosphide iodides.^[1] The bromoantimonates have antimony in positive oxidation states.

The antimony can be linked into chains, in which case it has a formal oxidation state of −1. Alternately it can be in pairs as Sb₂, with an oxidation state of −2 for each atom.^[2]

Many of these compounds are clathrates, whereby there are two interpenetrating structures that are only weakly bound to each other by van der Waals force.

List

formula	system	space group	unit cell Å	volume	density	comment	ref
Ge38Sb8Br8	cubic	P43n	a=10.7893	756.5		clathrate	[3]
Cd2SbBr2	monoclinic	P21	a=8.244 b=9.920 c=8.492 β=116.80			Contains Sb-Sb4−	[4]
Hg6Sb5Br7	cubic	Pa3	a=13.003 Z=4	2198.6	7.165	black	[2]
Hg7Sb4Br6	cubic	Pa3	a = 12.9940 Z = 4			black	[5][6]
Hg19Sb10Br18							[7]
(Hg13Sb8)(ZnBr4)4	orthorhombic	Pnma	a=27.120 b=12.965 c=14.579 Z=4	4126	6.637		[8]
Sb2Hg3GaBr4	orthorhombic	Pnma	a = 13.7549, b = 12.690, c = 14.7819, Z = 8			red	[9]
[Hg6Sb4](InBr6)Br	cubic	Pa3	a = 12.8542 Z=4	2123.91	7.395	dark red	[10]
Hg12Sb6(Br5.186I6.814)	triclinic	P1	a = 7.791 b = 11.680 c = 12.404 α = 112.76° β = 99.99° γ = 102.04° Z=1	976,7	7.477	orange; band gap 2.1 eV	[7]
Hg3Sb2TlBr3	orthorhombic	Pbcm	a = 6.610, b = 13.112 c = 13.071			black	[11]
Hg6Sb4BiBr7	cubic	Pa3	a=12.998 Z=4	2196.0	7.437	black	[2]