Dimroth-Reichardt ET parameter

{
  "id": "MLC-T-CHM-003227",
  "term": "Dimroth-Reichardt ET parameter",
  "field": "Chemistry",
  "definition": "An empirical parameter used to quantify the polarity of solvents, based on the solvatochromic shift of a specific pyridinium N-phenoxide betaine dye. This dye exhibits a strong color change depending on the solvent's polarity, with the absorption maximum shifting to shorter wavelengths in more polar solvents. The ET(30) value is derived from the transition energy of this absorption band.",
  "synonyms": [
    "ET-value"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Z-value",
    "Grunwald-Winstein equation",
    "ionizing power",
    "polarity",
    "wavelength"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1106 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/dimroth-reichardt-et-parameter/"
}