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P2I4 is a subiodide of phosphorus.

In chemistry, subhalide usually refers to inorganic compounds that have a low halide:metal ratio, made possible by metal–metal bonding (or element–element bonding for nonmetals), sometimes extensive. Many compounds meet this definition.


The normal halide of boron is BF3. Boron forms many subhalides: several B2X4, including B2F4; also BF. Aluminium forms a variety of subhalides. For gallium, adducts of Ga2Cl4 are known. Phosphorus subhalides include P2I4, P4Cl2, and P7Cl3 (structurally related to P73−). For bismuth, the compound originally described as bismuth monochloride was later shown to consist of Bi95+ clusters and chloride anions.[1] There are many tellurium subhalides, including Te3Cl2, Te2X (X = Cl, Br, I), and two forms of TeI.[2]


  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  2. ^ Zhengtao Xu "Recent Developments in Binary Halogen–Chalcogen Compounds, Polyanions and Polycations" in Handbook of Chalcogen Chemistry: New Perspectives in Sulfur, Selenium and Tellurium, Francesco Devillanova, Editor, 2006, RSC. pp. 381-416. Royal Society doi:10.1039/9781847557575-00455