It is a Lewis acid and has been used in organic synthesis.

[2] It has the same crystal structure as aluminium trichloride, with 6 coordinate indium atoms.

The dimer has bridging bromine atoms with a structure similar to dimeric aluminium trichloride Al2Cl6.

[3] It is formed by the reaction of indium and bromine.

[5][6][7][8] In refluxing xylene solution InBr3 and In metal react to form InBr2.