Subhalide
In chemistry, subhalide usually refers to inorganic compounds that have a low ratio of halide to metal, made possible by metal–metal bonding, sometimes extensive. Many compounds meet this definition.
Examples
The normal halide of boron is [boron trifluoride|]. Boron forms many subhalides: several, including [diboron tetrafluoride|]; also BF. Aluminium forms a variety of subhalides. For gallium, adducts of are known. Phosphorus subhalides include [diphosphorus tetraiodide|],, and . 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 [tritellurium dichloride|], [ditellurium bromide|], and two forms of TeI.