In chemistry, subhalide usually refers to inorganic compounds that have a low ratio of halide to metal, made possible by metalâÂÂmetal bonding (or elementâÂÂelement bonding for nonmetals), sometimes extensive. Many compounds meet this definition.
The normal halide of boron is . Boron forms many subhalides: several , including ; also BF. Aluminium forms a variety of subhalides. For gallium, adducts of are known. Phosphorus subhalides include , , and (structurally related to ). For bismuth, the compound originally described as bismuth monochloride was later shown to consist of clusters and chloride anions. There are many tellurium subhalides, including , (X = Cl, Br, I), and two forms of TeI.