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Basic and cationic dyes

Basic Orange 31

Also known as 2-[(4-Aminophenyl)azo]-1,3-dimethyl-1H-imidazolium chloride, Colorex bo31, 2-((4-Aminophenyl)azo)-1,3-dimethyl-1H-imidazolium chloride

CAS 97404-02-9Formula C11H14ClN5Molar mass 251.72 g/molEC 306-764-4
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant, Hazardous to the environment 6 suppliers listed
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Basic Orange 31 chemical structure, C11H14ClN5, CAS 97404-02-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
97404-02-9
Formula
C11H14ClN5
Molar mass
251.72 g/mol
EC number
306-764-4
HS code
320413
Category
Basic and cationic dyes

What is Basic Orange 31?

Plain description, key identifiers and synonyms

Basic Orange 31 is a chemical substance with the molecular formula C11H14ClN5 and a molar mass of 251.72 g/mol. Its CAS registry number is 97404-02-9. The IUPAC name is 4-[(1,3-dimethylimidazol-1-ium-2-yl)diazenyl]aniline chloride.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[(1,3-dimethylimidazol-1-ium-2-yl)diazenyl]aniline chloride
CAS number
97404-02-9 CAS number cross-checkedOther or deprecated CAS: 1016649-32-3
EC number
306-764-4
Molecular formula
C11H14ClN5
UNII
O1JIQ710E2
INCI name
BASIC ORANGE 31
InChIKey
KEVCVWPVGPWWOI-UHFFFAOYSA-N
InChI
InChI=1S/C11H13N5.ClH/c1-15-7-8-16(2)11(15)14-13-10-5-3-9(12)4-6-10;/h3-8,12H,1-2H3;1H
SMILES (canonical and isomeric)
CN1C=C[N+](=C1N=NC2=CC=C(C=C2)N)C.[Cl-]

Synonyms

  • 2-[(4-Aminophenyl)azo]-1,3-dimethyl-1H-imidazolium chloride
  • Colorex bo31
  • 2-((4-Aminophenyl)azo)-1,3-dimethyl-1H-imidazolium chloride
  • Vibracolor flame orange
  • 1H-Imidazolium, 2-(2-(4-aminophenyl)diazenyl)-1,3-dimethyl-, chloride (1:1)
  • 1H-Imidazolium, 2-[2-(4-aminophenyl)diazenyl]-1,3-dimethyl-, chloride (1:1)
  • Flame Orange
  • 4-[(1,3-dimethylimidazol-1-ium-2-yl)diazenyl]aniline, chloride
  • 2-[(4-Aminophenyl)azo]-1,3-dimethyl-1H-imidazoliumchloride
  • FlameOrange
  • laranja basico 31
  • naranja basica 31
  • orange de base 31
  • arancio di base 31
  • MIP Orange 3100
  • Colipa b118
  • 2-((4-Aminophenyl)diazenyl)-1,3-dimethyl-1H-imidazol-3-ium chloride
  • 2-(4-amino-phenylazo)-1,3-dimethyl-3H-imidazol-1-ium chloride
  • 2-[(E)-(4-Aminophenyl)diazenyl]-1,3-dimethyl-1H-imidazol-3-ium chloride

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
251.72 g/molcalc.
Exact mass
251.0938 Dacalc.
LogP (octanol/water)
-1.15calc.
Topological polar surface area
59.55 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
17calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.18calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccc(N=Nc2ncc[nH]2)cc1

c1ccc(N=Nc2ncc[nH]2)cc1

2 rings, 13 atoms, the 2-(Phenylazo)-1H-imidazole ring system.

67 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H332Harmful if inhaled.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (19)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Basic Orange 31 suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 6 suppliers
6 of 6 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

6 suppliers in 3 countries

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Basic Orange 31 price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Cosmetic ingredient, INCI name BASIC ORANGE 31(hair dyeing)

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex III, restricted in cosmetics
    Name: BASIC ORANGE 31, Ref no: 276, Annex ref: III/276

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Basic Orange 31 is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Basic Orange 31 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Basic Orange 31, based on the data on this page

What is Basic Orange 31?

Basic Orange 31 is a chemical substance with the molecular formula C11H14ClN5 and a molar mass of 251.72 g/mol. Its CAS registry number is 97404-02-9. The IUPAC name is 4-[(1,3-dimethylimidazol-1-ium-2-yl)diazenyl]aniline chloride.

What is the CAS number of Basic Orange 31?

The CAS registry number of Basic Orange 31 is 97404-02-9. Other or deprecated CAS numbers: 1016649-32-3.

What is the molecular formula and weight of Basic Orange 31?

The molecular formula of Basic Orange 31 is C11H14ClN5 and its molar mass is 251.72 g/mol.

What is Basic Orange 31 used for?

Known uses and roles of Basic Orange 31 include colorants in cosmetics and personal care, textile dyes in textiles and leather, hair dyeing and dye.

Is Basic Orange 31 hazardous?

Basic Orange 31 carries the GHS signal word "Danger". Main hazards: harmful if swallowed, harmful in contact with skin, may cause an allergic skin reaction. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Basic Orange 31?

Basic Orange 31 is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Basic Orange 31?

CompoundList lists 6 suppliers of Basic Orange 31 in China, India and Italy. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Basic Orange 31 in India?

1 supplier in India list Basic Orange 31 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Basic Orange 31?

Suppliers quote Basic Orange 31 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Basic Orange 31

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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