zwitterion - definizione. Che cos'è zwitterion
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Cosa (chi) è zwitterion - definizione

CLASS OF MOLECULAR CHEMICAL COMPOUNDS WITH LOCALIZED IONIC CHARGES
Zwitterionic; Internal salt; Double ion; Inner salt; Zwitteron; Zwiterion; Zwitterions; Dipolar zion; Dipolar ion
  • An [[amino acid]] contains both acidic (carboxylic acid fragment) and basic (amine fragment) centres. The isomer on the right is a zwitterion.

zwitterion         
['zw?t?r???n, 'tsv?-]
¦ noun Chemistry an ion having separate positively and negatively charged groups.
Derivatives
zwitterionic adjective
Origin
early 20th cent.: Ger. Zwitterion, from Zwitter 'a hybrid' + Ion 'ion'.
Quinonoid zwitterion         
  • center
A quinonoid zwitterion is a special type of zwitterion (or more precisely Mesoionic) based on quinone related chemical compounds. The benzene derivate 1,3-dihydroxy-4,6-diaminobenzene is easily oxidized by air in water or methanol to the quinonoid.
Criegee intermediate         
  • Criegee [[zwitterion]]
  • Ozone reacts with an alkene to form a carbonyl and a carbonyl oxide, known as a Criegee intermediate.
CLASS OF CHEMICAL COMPOUNDS
Criegee zwitterion; Criegee biradical; Criegee biradicals; Criegee intermediates
A Criegee intermediate (also called a Criegee zwitterion or Criegee biradical) is a carbonyl oxide with two charge centres. These chemicals may react with sulfur dioxide and nitrogen oxides in the earth's atmosphere, and are implicated in the formation of aerosols, which are an important factor in controlling global climate.

Wikipedia

Zwitterion

In chemistry, a zwitterion ( TSVIT-ə-rye-ən; from German Zwitter [ˈtsvɪtɐ] 'hermaphrodite'), also called an inner salt or dipolar ion, is a molecule that contains an equal number of positively- and negatively-charged functional groups. With amino acids, for example, in solution a chemical equilibrium will be established between the "parent" molecule and the zwitterion.

Betaines are zwitterions that cannot isomerize to an all-neutral form, such as when the positive charge is located on a quaternary ammonium group. Similarly, a molecule containing a phosphonium group and a carboxylate group cannot isomerize.