Viologens

{
  "id": "MLC-T-CHM-012583",
  "term": "Viologens",
  "field": "Chemistry",
  "definition": "Derivatives of 4,4'-bipyridine, specifically the diquaternary salts formed from the N,N'-dialkylation of the parent heterocycle. They are characterized by their ability to undergo reversible one-electron reduction to form stable, intensely colored radical cations. This electrochromic behavior is responsible for their use as redox indicators and in smart windows; the parent compound, methyl viologen, is also known as the herbicide paraquat.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1374 (https://doi.org/10.1351/pac199567081307)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/viologens/"
}