Chemistry:Thallium(I) bromide

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Thallium(I) bromide
Thallium(I) bromide
Other names
Thallium monobromide
3D model (JSmol)
EC Number
  • 232-163-0
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]
0.59 g/L (25 °C)[1]
−63.9·10−6 cm3/mol[2]
2.418 (0.59 µm)
2.350 (0.75 µm)
2.289 (1 µm)
1.984 (5 µm)
2.322 (20 µm)[3]
CsCl, cP2
Pm3m, No. 221[4]
Cubic (Tl+)
Cubic (Br)
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R-phrases (outdated) R26/28, R33, R51/53
S-phrases (outdated) (S1/2), S13, S28, S45, S61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 ☑Y☒N ?)
Infobox references

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.

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]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Haynes, p. 4.94
  2. Haynes, p. 4.135
  3. Haynes, p. 10.242
  4. 4.0 4.1 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. doi:10.1088/0370-1328/77/2/331. Bibcode1961PPS....77..471B. 
  7. Thallium Bromide Material safety data sheet.

Cited sources