Indium(I) bromide is a chemical compound of indium and bromine. It is a red crystalline compound that is isostructural with β-TlI and has a distorted rock salt structure. Indium(I) bromide is generally made from the elements, heating indium metal with InBr3. It has been used in the sulfur lamp. In organic chemistry, it has been found to promote the coupling of α, α-dichloroketones to 1-aryl-butane-1,4-diones. Oxidative addition reactions with for example alkyl halides to give alkyl indium halides and with NiBr complexes to give Ni-In bonds are known. It is unstable in water decomposing into indium metal and indium tribromide. When indium dibromide is dissolved in water, InBr is produced as a, presumably, insoluble red precipitate, that then rapidly decomposes.
^J. Weiss, T. Priermeier and R. A. Fischer (1996). "Reactions of Elemental Indium and Indium(I) Bromide with Nickel-Bromine Bonds: Structure of (η5-C5H5)(Ph3P)Ni-InBr2(O=PPh3)". Inorg. Chem.35 (1): 71–75. doi:10.1021/ic950614i.