mesoionic compound
（ plural ）
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(chemistry) 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).
mesoionic compound
The research paper reported that the mesoionic compound displayed unusual reactivity due to its delocalized sextet of π-electrons in the five-membered ring.
The research paper reported that the mesoionic compound displayed unusual reactivity due to its delocalized sextet of π-electrons in the five-membered ring.
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