Nonclassical structure

{
  "id": "MLC-T-CHM-008009",
  "term": "Nonclassical structure",
  "field": "Chemistry",
  "definition": "A molecular structure that cannot be accurately described by traditional Lewis structures involving only two-electron, two-center bonds. These structures often feature delocalized bonding where electrons are shared among more than two atoms, such as in three-center, two-electron bonds. Boranes and certain carbocations are prominent examples of compounds exhibiting nonclassical structures.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "angle",
    "cation",
    "hypercoordination",
    "isomeric",
    "resonance",
    "valence"
  ],
  "references": [
    "PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1955 (https://doi.org/10.1351/pac199971101919)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/nonclassical-structure/"
}