Chemistry:Iodine monobromide

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Iodine monobromide
IUPAC name
Iodine monobromide
Other names
Iodine bromide
3D model (JSmol)
Molar mass 206.904 g/mol
Appearance dark red solid
Melting point 42 °C (108 °F; 315 K)
Boiling point 116 °C (241 °F; 389 K)
Related compounds
Other anions
iodine monochloride, iodine monofluoride
Related interhalogen compounds
Iodine monochloride
Iodine monofluoride
Bromine monochloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Iodine monobromide is an interhalogen compound with the chemical symbol IBr. It is a dark red solid that melts near room temperature. Like iodine monochloride, IBr is used in some types of iodometry. It serves as a source of I+. Its Lewis acid properties are compared with those of ICl and I2 in the ECW model. It can form CT adducts with Lewis donors.[1]


Iodine monobromide is formed when iodine and bromine are combined in a chemical reaction:[2]

I2 + Br2 → 2 IBr


  1. Aragoni, M. Carla; Arca, Massimiliano; Demartin, Francesco; Devillanova, Francesco A.; Garau, Alessandra; Isaia, Francesco; Lippolis, Vito; Verani, Gaetano (2005-06-16). "DFT calculations, structural and spectroscopic studies on the products formed between IBr and N,N′-dimethylbenzoimidazole-2(3H)-thione and -2(3H)-selone" (in en). Dalton Transactions (13): 2252–2258. doi:10.1039/B503883A. ISSN 1477-9234. 
  2. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.