Thallium(I) bromide

Thallium(I) bromide
Names
	Other names Thallium monobromide
Identifiers
CAS Number	7789-40-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	56428 ;
ECHA InfoCard	100.029.239
EC Number	232-163-0;
PubChem CID	62677;
UNII	W18FF0756H ;
CompTox Dashboard (EPA)	DTXSID20894983 ;
	InChI InChI=1S/BrH.Tl/h1H;/q;+1/p-1 Key: PGAPATLGJSQQBU-UHFFFAOYSA-M ; 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EU classification (DSD) (outdated)	Very toxic (T+); Dangerous for the environment (N)
R-phrases (outdated)	R26/28, R33, R51/53
S-phrases (outdated)	(S1/2), S13, S28, S45, S61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).
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	Infobox references

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

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 and damage to central nervous system, liver and kidneys.[7]

References

Haynes, p. 4.94
Haynes, p. 4.135
Haynes, p. 10.242
Schulz, L. G. (1951). "Polymorphism of cesium and thallium halides". Acta Crystallographica. 4 (6): 487–489. doi:10.1107/S0365110X51001641.
Temperature Dependence of Spectroscopic Performance of Thallium Bromide X- and Gamma-Ray Detectors
Blackman, M; Khan, I H (1961). "The Polymorphism of Thallium and Other Halides at Low Temperatures". Proceedings of the Physical Society. 77 (2): 471. Bibcode:1961PPS....77..471B. doi:10.1088/0370-1328/77/2/331.
Thallium Bromide Material safety data sheet. espimetals.com

Cited sources

Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. ISBN 1439855110.

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[r1-1] Haynes, p. 4.94

[2] Haynes, p. 4.135

[3] Haynes, p. 10.242

[str-4] Schulz, L. G. (1951). "Polymorphism of cesium and thallium halides". Acta Crystallographica. 4 (6): 487–489. doi:10.1107/S0365110X51001641.

[5] Temperature Dependence of Spectroscopic Performance of Thallium Bromide X- and Gamma-Ray Detectors

[6] Blackman, M; Khan, I H (1961). "The Polymorphism of Thallium and Other Halides at Low Temperatures". Proceedings of the Physical Society. 77 (2): 471. Bibcode:1961PPS....77..471B. doi:10.1088/0370-1328/77/2/331.

[7] Thallium Bromide Material safety data sheet. espimetals.com