| 释义 |
meso-ionic compound meso-ionic compound[¦mez·ō·ī¦än·ik ′käm‚pau̇nd] (organic chemistry) Any of a class of five-membered ring heterocycles and their benzo derivatives which possess a sextet of pi electrons in association with the atoms composing the ring but which cannot be represented satisfactorily by any one covalent or polar structure. |