mesoionic compound

noun

any of a class of compounds having five-membered ring heterocycles (or their benzo derivatives) which possess a sextet of π-electrons in association with the atoms comprising the ring, but which cannot be represented by any one covalent or polar structure; typically the ring structure contains both positive and negative delocalised charges which cannot be associated with any one ring atom, and the negative charge can also be associated with a conjugated exocyclic atom (typically oxygen, sulfur, or nitrogen).

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Meanings

nounmesoionic compound (plural mesoionic compounds)

plural mesoionic compounds

  1. chemistryany of a class of compounds having five-membered ring heterocycles (or their benzo derivatives) which possess a sextet of π-electrons in association with the atoms comprising the ring, but which cannot be represented by any one covalent or polar structure; typically the ring structure contains both positive and negative delocalised charges which cannot be associated with any one ring atom, and the negative charge can also be associated with a conjugated exocyclic atom (typically oxygen, sulfur, or nitrogen).
Cite this entry
APA

mesoionic compound. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/mesoionic%20compound

MLA

“mesoionic compound.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mesoionic%20compound. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “mesoionic compound,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/mesoionic%20compound.

Source: mesoionic compound on Wiktionary, CC BY-SA 4.0.