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(Top) 1 See also 2 ReferencesDianion
●Čeština ●Gaeilge ●Slovenčina Edit links ●Article ●Talk ●Read ●Edit ●View history Tools Actions ●Read ●Edit ●View history General ●What links here ●Related changes ●Upload file ●Special pages ●Permanent link ●Page information ●Cite this page ●Get shortened URL ●Download QR code ●Wikidata item Print/export ●Download as PDF ●Printable version Appearance From Wikipedia, the free encyclopediaAdianion is an anion with a net charge of −2. While there exist many stable molecular dianions, such as BeF4 2− and MgF4 2−,[1] thus far no stable atomic dianion has been found: Electron shielding and other quantum mechanical effects tend to make the addition of another electron to an atomic anion unstable.[2]
The most heavily studied atomic dianion is H2−, usually as a short-lived resonance between an electron and a hydrogen ion.[2] In 1976, its half-life was experimentally measured to be 23 ± 4 nanoseconds.[3]
In the field of physiology, molecular dianions play an important roles, such as the monohydrogen phosphate ([HPO
4]2−
), present at a concentration of around 1 mM in the blood and in cells, where it plays a role in pH buffering.[4]