Basic Orange 2

Synonym(s):4-Phenylazo-m-phenylenediamine monohydrochloride;Basic Orange 2;Chrysoidine Y

CAS NO.：532-82-1
Empirical Formula: C12H13ClN4
Molecular Weight: 248.71
MDL number: MFCD00012976
EINECS: 208-545-8
SAFETY DATA SHEET (SDS)
Update Date: 2025-09-20 20:09:13

What is Basic Orange 2?

Chemical properties

BORDEAUX TO DEEP PURPLE CRYSTALLINE POWDER

The Uses of Basic Orange 2

Orange dye for cotton and silk.

What are the applications of Application

Chrysoidine G is a useful dye for biological research purposes

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.]

Properties of Basic Orange 2

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	Solubility Soluble in water, ethanol, acetone, methyl cellosolve, xylene; practically insoluble in Ibenzene
form	Crystalline Powder
Colour Index	11270
color	Bordeaux to deep purple
Odor	Odorless
PH Range	Orange (4.0) to yellow (7.0)
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
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 for Basic Orange 2

Signal word	Danger
Pictogram(s)	Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H318:Serious eye damage/eye irritation H341:Germ cell mutagenicity H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P201:Obtain special instructions before use. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P308+P313:IF exposed or concerned: Get medical advice/attention.