Stopper

{
  "id": "MLC-T-CHM-013597",
  "term": "Stopper",
  "field": "Chemistry",
  "definition": "A bulky group covalently attached to the ends of a linear component, preventing its dethreading from a macrocyclic component in a rotaxane. This group is too large to pass through the cavity of the macrocycle. The presence of stoppers defines the mechanical interlocking of the components.",
  "subject": "Polymer",
  "see_also": [
    "macrocyclic component",
    "rotaxane constitutional repeating unit",
    "threading component"
  ],
  "references": [
    "PAC, 2012, 84, 2135. 'Terminology and nomenclature for macromolecular rotaxanes and pseudorotaxanes (IUPAC Recommendations 2012)' on page 2144 (https://doi.org/10.1351/PAC-REC-11-10-15)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/stopper/"
}