Basic Orange 2 Chemical Properties

Melting point:

235 °C (dec.)(lit.)

Boiling point:

2262°C

Density 

1.2171 (rough estimate)

refractive index 

1.6110 (estimate)

storage temp. 

room temp

solubility 

Soluble in water, ethanol, acetone, methyl cellosolve, xylene; practically insoluble in Ibenzene

Colour Index 

11270

form 

Crystalline Powder

color 

Bordeaux to deep purple

PH Range

Orange (4.0) to yellow (7.0)

Odor

Odorless

λmax

449nm

Merck 

13,2279

BRN 

3724653

Major Application

Recording materials, waveguides, thin solid films, photographic materials, printing plates, inks, toners, detergents, corrosion inhibitors, rubber, textiles, hair dyes

InChIKey

MCTQNEBFZMBRSQ-GEEYTBSJSA-N

CAS DataBase Reference

532-82-1(CAS DataBase Reference)

IARC

3 (Vol. 8, Sup 7) 1987

EPA Substance Registry System

C.I. Basic Orange 2, monohydrochloride (532-82-1)

Safety Information

Hazard Codes 

N,Xn

Risk Statements 

50/53-68-41-38-22

Safety Statements 

60-61-46-36/37/39-26-23

RIDADR 

UN 3077 9/PG 3

WGK Germany 

2

RTECS 

ST3380000

HS Code 

32129000

Hazardous Substances Data

532-82-1(Hazardous Substances Data)

Toxicity

mma-sat 50 mg/plate MUREAV 44,9,77

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich

Basic Orange 2 Usage And Synthesis

Chemical Properties

BORDEAUX TO DEEP PURPLE CRYSTALLINE POWDER

Uses

Orange dye for cotton and silk.

Definition

A dye made from aniline.

General Description

Red-brown powder, large black shiny crystals with a green luster or purple powder.

Air & Water Reactions

Azo dyes can be explosive when suspended in air at specific concentrations.Slightly soluble in water.

Reactivity Profile

Basic Orange 2 is an azo compound. Toxic gases are formed by mixing compounds containing azo groups with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. Basic Orange 2 is incompatible with strong oxidizing agents.

Hazard

Questionable carcinogen.

Fire Hazard

Flash point data for Basic Orange 2 are not available. Basic Orange 2 is probably combustible.

Safety Profile

Moderately toxic by ingestion and subcutaneous routes. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits very toxic fumes of NO, and HCl. Used as a colorant in textiles, paper, leather, inks, wood, and biological stains

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	ORANGE
LIGHTING	1-2
SOAPING	3-4
PERSPIRATING	3-4
FRICTION(DRY)	4
FRICTION(WET)	3
RESIDUE ON 80 MESH	5.0% max
WATER SOLUBILE	1.0% max
VOLATITE 105°C	1.0% max
TINTING STRENGTH	100-105 %
WEIGHT METAL TOTAL	50ppm max

Purification Methods

It is a red-brown powder which is recrystallised from H2O. It gives a yellow solution in conc H2SO4 which turns orange on dilution. Its solubility at 15o is 5.5% (H2O), 4.75% (EtOH), 6.0% (cellosolve), 9.5% (ethylene glycol), 0.005% (xylene) and is insoluble in *C6H6. The hydroiodide has m 184o (from EtOH) and the picrate forms red needles m 196o. [Muramatsu Bull Chem Soc Jpn 31 864 1958, Beilstein 6 IV 561.]

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