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Word: mesoionic compound (lookup usage) (lookup stats)


Meaning:

Noun:

  • chemistry any of a class of compounds having five-membered ring heterocycles (or their benzo derivatives) which possess a sextet of ?-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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