 It is formed by the reaction of indium and bromine.InBr3 forms complexes with ligands, L, InBr3L, InBr3L2, InBr3L3.Reaction with indium metal forms lower valent indium bromides, InBr2, In4Br7, In2Br3, In5Br7, In7Br9, indium(I) bromide.