Zwitterion

a dipolar ion: a molecule that contains an equal number of positively and negatively charged functional groups From Wikipedia, the free encyclopedia

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A zwitterion is a type of chemical compound that has both positive and negative electrical charges in different parts of the molecule.[1]

Many zwitterions are tautomers of compounds that do not have these charges, and change between "neutral" and zwitterion forms based on the environment. Glycine, for example, is more stable as a zwitterion in a solution, but the "neutral" form as a pure gas.

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