Fluoran

Fluoran is a triarylmethane dye. It is the structural core of a variety of other dyes.[1]

Fluoran
Names
Preferred IUPAC name
3H-Spiro[[2]benzofuran-1,9′-xanthen]-3-one
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.008.984
UNII
  • InChI=1S/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H checkY
    Key: FWQHNLCNFPYBCA-UHFFFAOYSA-N checkY
  • InChI=1/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H
    Key: FWQHNLCNFPYBCA-UHFFFAOYAD
  • O=C2OC4(c1ccccc12)c5ccccc5Oc3ccccc34
Properties
C20H12O3
Molar mass 300.31
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

These dyes have a variety of applications such as chemical stains (for example eosins) and in thermal paper. Black 305 is a common leuco dye product for thermal paper.[2]

The chemical structure of eosin, a fluoran-based dye

References
  1. Hatano, Y. "The chemistry of fluoran leuco dyes" in Chemistry and Applications of Leuco Dyes, Ed. R. Muthyala, Plenum Press 1997
  2. "BLACK 305". Nagase America. Nagase America Corporation. Retrieved 24 August 2019.


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