zwitterionic compounds/zwitterions

Also contains definition of: dipolar ions
https://doi.org/10.1351/goldbook.Z06752
Neutral compounds having formal unit electrical charges of opposite sign. Some chemists restrict the term to compounds with the charges on non-adjacent atoms. Sometimes referred to as inner salts, dipolar ions (a misnomer). E.g. H3N+CH2C(=O)O ammonioacetate (glycine), (CH3)3N+–O trimethylamine oxide.
See:
betaines
,
dipolar compounds
,
ylides
Sources:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1176 [Terms] [Paper]
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1375 [Terms] [Paper]