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).
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	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]

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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.
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.
"Archived copy". Archived from the original on 2015-07-12. Retrieved 2011-04-24.CS1 maint: archived copy as title (link)

External links

echo Chemical Database: 1-Naphthalenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl)azo)-, monosodium salt (EnvironmentalChemistry.com)- This page contains information on the chemical 1-Naphthalenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl)azo)-, monosodium salt including: 72 synonyms/identifiers.

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[Ullmann-1] 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.

[2] 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.

[3] "Archived copy". Archived from the original on 2015-07-12. Retrieved 2011-04-24.CS1 maint: archived copy as title (link)