Onium compounds

{
  "id": "MLC-T-CHM-008240",
  "term": "Onium compounds",
  "field": "Chemistry",
  "definition": "Cations formed by the formal addition of a proton or an organic group to a neutral parent hydride, resulting in a positively charged species with a central atom bearing a formal positive charge. These compounds are characterized by a central atom that has one more bond than its typical valence, often nitrogen, oxygen, sulfur, or phosphorus. Examples include ammonium (NH4+) and sulfonium (R3S+) ions.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "cation",
    "arsonium compounds",
    "counter-ions",
    "halonium ions",
    "hydrocarbyl groups",
    "hydron",
    "iminium compounds",
    "nitrilium ions",
    "oxonium ions",
    "parent hydride",
    "phosphonium compounds",
    "quaternary ammonium compounds",
    "stibonium compounds",
    "sulfonium compounds"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1146 (https://doi.org/10.1351/pac199466051077)",
    "PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1353 (https://doi.org/10.1351/pac199567081307)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/onium-compounds/"
}