The arsonium

cation An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...

is a positively charged polyatomic ion with the

chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...

. An arsonium salt is a salt containing either the arsonium () cation, such as arsonium bromide () and arsonium iodide (), which can be synthesized by reacting arsine with hydrogen bromide or

hydrogen iodide Hydrogen iodide (HI) is a diatomic molecule and hydrogen halide. Aqueous solutions of HI are known as hydroiodic acid or hydriodic acid, a strong acid. Hydrogen iodide and hydroiodic acid are, however, different in that the former is a gas und ...

.Muñoz-Hernández, M. Á. (2006). Arsenic: Inorganic Chemistry. ''Encyclopedia of Inorganic Chemistry''. pp 4. DOI: 10.1002/0470862106.ia013 Or more commonly, as organic derivative such as the quaternary arsonium salts (CAS: , hydrate form) and the zwitterionic compound arsenobetaine.

References

Arsenic(−III) compounds Cations {{chem-compound-stub