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
ChemSpider	23621588
EC Number	216-760-3
Jmol interactive 3D	Image
MeSH	Fast+red+S
PubChem	23722700 23669381 (Z)-diazen 23670762 (E)-diazen
RTECS number	QK2420000
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)c1ccc(N=NC2C(=O)ccc3ccccc23)c2ccccc12
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 (also named Solid Red A, 2-Naphthol Red, Toyo roccelline, Fast Red A and so on) is a red azo dye. Due to its intense colour it looks almost black when solid. Instead of crystallising, it vitrifies when cooled or salted out of the solution. It has a pungent smell similar to that of benzoic acid.

Preparation

It can be obtained by azo coupling of naphthionic acid and 2-naphthol.

Uses

This compound is used in the textile industry as a dye.^[1] It can also be used for research in photocatalysis (as degradation object).^[2]

References

1. http://onlinelibrary.wiley.com/doi/10.1002/jctb.2083/abstract
2. http://www.scbt.kr/datasheet-214482-acid-red-88.html

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.