ACID ALIZARIN VIOLET N Property

Melting point:

>300°C

solubility 

Solubility Soluble in water, ethanol

pka

4.35, 7.4, 9.35(at 25℃)

form 

crystals

color 

Reddish-violet

PH Range

Orange-red (6.5) to violet (9.0)

λmax

501nm

Stability:

Stable. Incompatible with strong oxidizing agents.

Major Application

inks, dye lasers, in manufacture of vinyl polymers, textiles determination of iron, calcium, aluminum, tantalum, monitoring hardness in industrial water, measuring chlorine dioxide in drinking water, hypoglycemic agents, nuclear fluorochrome

CAS DataBase Reference

2092-55-9

EPA Substance Registry System

Benzenesulfonic acid, 4-hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-, monosodium salt (2092-55-9)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

24/25-37/39-26

RTECS 

DB7012000

Hazard and Precautionary Statements (GHS)

ACID ALIZARIN VIOLET N Chemical Properties,Usage,Production

Chemical Properties

red powder

Preparation

3-Amino-4-hydroxybenzenesulfonic acid diazotization, and Naphthalen-2-ol coupling.

Properties and Applications

dark red light purple. Soluble in water for magenta, soluble in ethanol for red orange, slightly soluble in acetone. In concentrated sulfuric acid to red light purple, after dilution to orange; In concentrated nitric acid for yellow brown. Dye aqueous solution to join concentrated hydrochloric acid for orange; Join concentrated sodium hydroxide solution for brown light orange.

Purification Methods

Convert the acid to the monosodium salt by precipitation with NaOAc/AcOH buffer of pH 4, then purify by precipitation of the free acid from aqueous solution with conc HCl, washing and extracting with EtOH in a Soxhlet extractor. The acid precipitates on evaporating the EtOH and is reconverted to the sodium salt as described for Chlorazole Sky Blue FF. Dry it at 110o. It is hygroscopic. [Coates & Rigg Trans Faraday Soc 57 1088 1961, Beilstein 16 II 127.]