Thallium(I) bromide

Thallium(I) bromide is a chemical compound of thallium and bromine with a chemical formula TlBr. This salt is used in room-temperature detectors of X-rays, gamma-rays and blue light, as well as in near-infrared optics.

Thallium(I) bromide

Names
Other names Thallium monobromide
Identifiers
CAS Number	7789-40-4 Y
3D model (JSmol)	Interactive image
ChemSpider	56428 Y
ECHA InfoCard	100.029.239
EC Number	232-163-0
PubChem CID	62677
UNII	W18FF0756H Y
CompTox Dashboard (EPA)	DTXSID20894983
InChI InChI=1S/BrH.Tl/h1H;/q;+1/p-1 Y Key: PGAPATLGJSQQBU-UHFFFAOYSA-M Y InChI=1/BrH.Tl/h1H;/q;+1/p-1 Key: PGAPATLGJSQQBU-REWHXWOFAZ
SMILES Br[Tl]
Properties
Chemical formula	TlBr
Molar mass	284.287 g/mol[1]
Appearance	yellow crystalline solid[1]
Density	7.5 g/cm3[1]
Melting point	460 °C (860 °F; 733 K)[1]
Boiling point	819 °C (1,506 °F; 1,092 K)[1]
Solubility in water	0.59 g/L (25 °C)[1]
Magnetic susceptibility (χ)	−63.9·10−6 cm3/mol[2]
Refractive index (nD)	2.418 (0.59 µm) 2.350 (0.75 µm) 2.289 (1 µm) 1.984 (5 µm) 2.322 (20 µm)[3]
Structure
Crystal structure	CsCl, cP2
Space group	Pm3m, No. 221[4]
Formula units (Z)	1
Coordination geometry	Cubic (Tl+) Cubic (Br−)
Hazards
EU classification (DSD) (outdated)	Very toxic (T+) Dangerous for the environment (N)
R-phrases (outdated)	R26/28, R33, R51/53
S-phrases (outdated)	(S1/2), S13, S28, S45, S61
Related compounds
Other anions	Thallium(I) fluoride, Thallium(I) chloride, Thallium(I) iodide
Other cations	Indium(I) bromide, Lead(II) bromide Bismuth bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

It is a semiconductor with a band gap of 2.68 eV.[5]

The crystalline structure is of cubic CsCl type at room temperature, but it lowers to the orthorombic thallium iodide type upon cooling, the transition temperature being likely affected by the impurities.[6] Nanometer-thin TlBr films grown on LiF, NaCl or KBr substrates exhibit a rocksalt structure.[4]

Thallium is extremely toxic and a cumulative poison which can be absorbed through the skin. Acute and chronic effects of ingesting thallium compounds include fatigue, limb pain, peripheral neuritis, joint pain, loss of hair, diarrhea, vomiting, vision loss, and damage to central nervous system, liver and kidneys.[7]