Acid red 88

Chemical compound From Wikipedia, the free encyclopedia

Acid red 88 is an azo dye. Due to its intense colour, solid samples appear almost black. It is used to dye cotton textiles red.[1] A closely related acid dye is Acid Red 13.

Quick facts Names, Identifiers ...
Acid red 88
Kekulé, skeletal formula of acid red 88
Ball-and-stick model of the component ions of acid red 88
Names
IUPAC name
Sodium 4-(2-hydroxy-1-naphthalenylazo)-naphthalenesulfonate
Other names
Fast Red A

2-Naphthol Red
Roccelline
Solid Red A

Toyo roccelline
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.015.238 Edit this at Wikidata
EC Number
  • 216-760-3
MeSH Fast+red+S
RTECS number
  • QK2420000
UNII
  • InChI=1S/C20H14N2O4S.Na/c23-18-11-9-13-5-1-2-6-14(13)20(18)22-21-17-10-12-19(27(24,25)26)16-8-4-3-7-15(16)17;/h1-12,20H,(H,24,25,26);/q;+1/p-1 ☒N
    Key: IVEHGZAIVWEKHA-UHFFFAOYSA-N ☒N
  • [Na+].O=S(=O)([O-])c3ccc(N=Nc1c(O)ccc2ccccc12)c4ccccc34
Properties
C20H13N2NaO4S
Molar mass 400.38 g·mol−1
Appearance Vivid, dark red, opaque, vitreous solid
Melting point 280 °C (536 °F; 553 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation and use

It can be obtained by azo coupling of naphthionic acid and 2-naphthol. Instead of crystallising, it vitrifies when cooled or salted out of the solution.

This compound is used in the textile industry as a dye.[2] It can also be used for research in photocatalysis (as degradation object).[3]

References

External links

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