4-Amino-5-hydroxynaphthalin-2,7-disulfonsure

Bezeichnung:4-Amino-5-hydroxynaphthalin-2,7-disulfonsure

CAS-Nr90-20-0

Englisch Name:1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

CBNumberCB7306275

SummenformelC10H9NO7S2

Molgewicht319.31

MOL-Datei90-20-0.mol

Synonyma

4-Amino-5-hydroxynaphthalin-2,7-disulfonsure

4-Amino-5-hydroxynaphthalin-2,7-disulfonsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	>300 °C(lit.)
Dichte	1.6832 (rough estimate)
Brechungsindex	1.7640 (estimate)
Löslichkeit	DMSO (Slightly, Heated), Methanol (Slightly), Water (Slightly)
pka	-0.95±0.40(Predicted)
Aggregatzustand	Solid
Farbe	Light Beige to Beige
CAS Datenbank	90-20-0(CAS DataBase Reference)
EPA chemische Informationen	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (90-20-0)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36
WGK Germany	3
HS Code	2922210060

Gefahreninformationscode (GHS)

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
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.
Verwenden
4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid is useful for preparing reactive dyes.
läuterung methode
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.]

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Upstream-Materialien And Downstream Produkte

4-Amino-5-hydroxynaphthalin-2,7-disulfonsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

90-20-0, 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Verwandte Suche:

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