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Dyes and pigments

Indophenol blue

Also known as 1(4H)-Naphthalenone, 4-[[4-(dimethylamino)phenyl]imino]-, C.I. 49700, Indophenol blue cyan

CAS 132-31-0Formula C18H16N2OMolar mass 276.34 g/molEC 205-056-1
GHS signal word: Warning. Pictograms: Harmful or irritant
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Indophenol blue chemical structure, C18H16N2O, CAS 132-31-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
132-31-0
Formula
C18H16N2O
Molar mass
276.34 g/mol
EC number
205-056-1
HS code
292529
Category
Dyes and pigments

What is Indophenol blue?

Plain description, key identifiers and synonyms

Indophenol blue is a chemical substance with the molecular formula C18H16N2O and a molar mass of 276.34 g/mol. Its CAS registry number is 132-31-0. The IUPAC name is 4-[4-(dimethylamino)phenyl]iminonaphthalen-1-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[4-(dimethylamino)phenyl]iminonaphthalen-1-one
CAS number
132-31-0 CAS number cross-checkedOther or deprecated CAS: 136023-77-3
EC number
205-056-1
Molecular formula
C18H16N2O
UNII
IFU74WR4XQ
MDL number
MFCD00041739
InChIKey
VRZJGENLTNRAIG-UHFFFAOYSA-N
InChI
InChI=1S/C18H16N2O/c1-20(2)14-9-7-13(8-10-14)19-17-11-12-18(21)16-6-4-3-5-15(16)17/h3-12H,1-2H3
SMILES (canonical and isomeric)
CN(C)C1=CC=C(C=C1)N=C2C=CC(=O)C3=CC=CC=C23

Synonyms

  • 1(4H)-Naphthalenone, 4-[[4-(dimethylamino)phenyl]imino]-
  • C.I. 49700
  • Indophenol blue cyan
  • N-(p-Dimethylaminophenyl)-1,4-naphthoquinoneimine
  • p-(Dimethylamino)phenyl-1,4-naphthoquinoneimine
  • CI 49700
  • 1,4-Naphthoquinone imine, N-(p-(dimethylamino)phenyl)-
  • 1(4H)-Naphthalenone, 4-((4-(dimethylamino)phenyl)imino)-
  • 1(4H)-Naphthalenone, 4-((p-(dimethylamino)phenyl)imino)-
  • 4-((4-(Dimethylamino)phenyl)imino)-1(4H)-naphthalenone
  • 1(4H)-Naphthalenone, 4-((4-(dimethylamino)phenyl)imino)-, (E)-
  • 1(4H)-Naphthalenone, 4-[[p-(dimethylamino)phenyl]imino]-
  • 1(4H)-Naphthalenone, 4-((p-(dimethylamino)phenyl)imino)-(8CI)
  • 4-((4-(Dimethylamino)phenyl)imino)naphthalen-1(4H)-one
  • 4-[4-(dimethylamino)phenyl]iminonaphthalen-1-one
  • 1, N-[p-(dimethylamino)phenyl]-
  • N-(4-Dimethylaminophenyl)-1,4-naphthoquinoneimine
  • alpha-Naphthol Blue
  • 4-{[4-(Dimethylamino)phenyl]imino}naphthalen-1(4H)-one
  • N-(4-Dimethylaminophenyl)-1,4-naphthoquinomeimine
  • Indophenol Blue, Dye content 60 %
  • N-(4-Dimethylaminophenyl)-1,4-naphthoqu
  • (4E)-4-(4-dimethylaminophenyl)iminonaphthalen-1-one
  • 4-[[4-(dimethylamino)-phenyl]imino]-naphthalen-1-one
  • (E)-4-(4-(dimethylamino)phenylimino)naphthalen-1(4H)-one
Show all 28 synonyms
  • 4-([4-(Dimethylamino)phenyl]imino)-1(4H)-naphthalenone #
  • (4E)-4-{[4-(Dimethylamino)phenyl]imino}naphthalen-1(4H)-one
  • (Z)-4-((4-(dimethylamino)phenyl)imino)naphthalen-1(4H)-one

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
276.34 g/molcalc.
Exact mass
276.1263 Dacalc.
LogP (octanol/water)
3.63calc.
Topological polar surface area
32.67 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
21calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.11calc.
Formal charge
0calc.
Stereocentres
0calc.
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, O=C1C=CC(=Nc2ccccc2)c2ccccc21

O=C1C=CC(=Nc2ccccc2)c2ccccc21

3 rings, 18 atoms, the (4E)-4-(Phenylimino)naphthalen-1(4H)-one ring system.

17 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • 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

Indophenol blue suppliers

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Indophenol blue 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Indophenol blue is traded under.

HS 2925.29Indicative HS code

Imines and their derivatives, salts thereof, other

World exports in 2024
$1.8B
+12.4% vs 2023, imports $1.84B
2019 to 2024
Top exporters
  1. China35.9%
  2. France * partner reported15.5%
  3. Germany9.1%
Top importers
  1. United States13.3%
  2. China13.0%
  3. Brazil9.7%

* Partner reported figures, a lower bound.

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

The HS code shown for Indophenol blue is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Indophenol blue, based on the data on this page

What is Indophenol blue?

Indophenol blue is a chemical substance with the molecular formula C18H16N2O and a molar mass of 276.34 g/mol. Its CAS registry number is 132-31-0. The IUPAC name is 4-[4-(dimethylamino)phenyl]iminonaphthalen-1-one.

What is the CAS number of Indophenol blue?

The CAS registry number of Indophenol blue is 132-31-0. Other or deprecated CAS numbers: 136023-77-3.

What is the molecular formula and weight of Indophenol blue?

The molecular formula of Indophenol blue is C18H16N2O and its molar mass is 276.34 g/mol.

Is Indophenol blue hazardous?

Indophenol blue carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Indophenol blue?

Indophenol blue is usually classified under HS code 292529 (Imines and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Indophenol blue?

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What is the price of Indophenol blue?

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Guides for buyers

Practical guides that help when you source, ship or handle Indophenol blue

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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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