Acid red 88

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
CAS Number	1658-56-6 (E)-diazen ;
3D model (JSmol)	Interactive image;
ChemSpider	23621588 ;
ECHA InfoCard	100.015.238
EC Number	216-760-3;
MeSH	Fast+red+S
PubChem CID	23722700; 23669381 (Z)-diazen; 23670762 (E)-diazen;
RTECS number	QK2420000;
UNII	7Z2135Z4K4 (E)-diazen ;
CompTox Dashboard (EPA)	DTXSID1041714 ;
	InChI 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 Key: IVEHGZAIVWEKHA-UHFFFAOYSA-N ;
	SMILES [Na+].O=S(=O)([O-])c3ccc(N=Nc1c(O)ccc2ccccc12)c4ccccc34;
Properties
Chemical formula	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). verify (what is ?) Infobox references

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.

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

^ Hunger, Klaus; Mischke, Peter; Rieper, Wolfgang; Raue, Roderich; Kunde, Klaus; Engel, Aloys (2005). "Azo Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a03_245. ISBN 3527306730.
^ Song, Ya-Li; Li, Ji-Tai; Chen, Hua (2009). "Degradation of C.I. Acid Red 88 aqueous solution by combination of Fenton's reagent and ultrasound irradiation". J. Chem. Technol. Biotechnol. 84 (4): 578–583. doi:10.1002/jctb.2083.
^ "Acid red 88 | CAS 1658-56-6 | Santa Cruz Biotech". Archived from the original on 2015-07-12. Retrieved 2011-04-24.