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HomeProduct name list1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

  • CAS NO.:90-20-0
  • Empirical Formula: C10H9NO7S2
  • Molecular Weight: 319.31
  • MDL number: MFCD00035728
  • EINECS: 201-975-7
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2023-11-07 17:00:51
1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Structural

What is 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid?

Chemical properties

1-Amino-8-hydroxynaphthalene-3,6-disulfonic acid [90-20-0]. (4-amino-5-hydroxynaphthalene-2,7-disulfonic acid), H acid, C10H9NO7S2, Mr 319.3, is usually isolated as its monosodium salt [5460-09-3], a gray powder that is slightly soluble in cold water and readily soluble in hot water; the disodium salt is very soluble in water. With diazo compounds, H acid couples ortho to the amino group under acid conditions and ortho to the hydroxyl group under alkaline conditions. Bisazo derivatives are formed by stepwise acid and alkaline coupling, with the much slower acid coupling being performed first.

The Uses of 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid is useful for preparing reactive dyes.

Purification Methods

A slightly alkaline solution of Na2CO3 (ca 22g) in water (litmus) is added to a solution of 100g of the dry acid in 750mL of hot distilled water, followed by 5g of activated charcoal and 5g of Celite. The suspension is stirred for 10minutes and filtered by suction. The acid is then precipitated by adding ca 40mL of conc HCl (solution is blue to Congo Red), then filter it by suction through a shark skin filter circular sheet (or hardened filter paper) and wash it with 100mL of distilled water. The purification process is repeated. The acid is dried overnight in an oven at 60o and stored in a dark bottle The diethylamine salt has m 306-307o(dec, from aqueous EtOH). [Post & Moore Anal Chem 31 1872 1959]. [Beilstein 14 H 840, 14 I 758, 14 II 502, 14 III 2292, 14 IV 2824.]

Properties of 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

Melting point: >300 °C(lit.)
Density  1.6832 (rough estimate)
refractive index  1.7640 (estimate)
solubility  DMSO (Slightly, Heated), Methanol (Slightly), Water (Slightly)
form  Solid
pka -0.95±0.40(Predicted)
color  Light Beige to Beige
CAS DataBase Reference 90-20-0(CAS DataBase Reference)
EPA Substance Registry System 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (90-20-0)

Safety information for 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P260:Do not breathe dust/fume/gas/mist/vapours/spray.
P271:Use only outdoors or in a well-ventilated area.
P280:Wear protective gloves/protective clothing/eye protection/face protection.

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