Zwitterions

Zwitterion

In chemistry, a zwitterion (/ˈtsvɪtəˌraɪən/ 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. (Wikipedia).

Zwitterion
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Related pages

Carboxylate | Cocamidopropyl betaine | Betaine | Phosphonium | Dipalmitoylphosphatidylcholine | Amino acid | PH | Polysulfobetaine | Trimethylglycine | Neutron diffraction