Pigment Red 81

Product NamePIGMENT RED 81
SynonymsC.I.Pigment Red 81; C.I.PR81; PR81; P.R.81
CAS NO.12224-98-5
Molecular Weight443.56
Molecular FormulaC28H31N2O3
ColorRed powder

Molecular structure formula:

Fastness Properties of Pigment Red 81:1:

Light Fastness3
Heat Resistance(℃)140
Water Resistance4-5
Oil Resistance5
Acid Resistance4
Alkali Resistance4
Alcohol Resistance4

Main application: Water based ink, Offset ink, Solvent based ink, Plastic, Paint, Textile printing

We have various pigment grades and properties to meet different customers’ needs, please specify your application and requirements so that we can recommend accordingly.  E-mail: sy@sypigment.com

Product Description of Pigment Red 81:

Pigment Red 81 is a pure blue red color, which is in line with the magenta hue used in four-color plate overprint printing inks, and has high color strength. It is mainly used for coloring of printing ink and cultural and educational supplies, but it has low resistance to polar solvents, such as alcohols, ketones and esters or their mixtures, while it is more stable to aromatic hydrocarbons and paraffin wax.

C.I. Pigment Red 81, in the form of a red powder, is a triarylcarbonium dye that can be used in printing ink applications. This product has a specific gravity between 1.80 and 2.20, a bulk volume between 3.0 and 3.5 l/kg, and an average particle size between 100 and 200 nanometers.

TDS (Pigment Red 81) MSDS (Pigment Red 81)


  • C.I. Pigment Red 81
  • rhodamine 6G cation
  • Pigment red 81
  • 12224-98-5
  • 47724-48-1
  • UNII-923TYK19HG
  • 923TYK19HG
  • [9-(2-ethoxycarbonylphenyl)-6-(ethylamino)-2,7-dimethylxanthen-3-ylidene]-ethylazanium
  • 63022-06-0
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatesilicate
  • 63022-07-1
  • 9-(2-(Ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethylxanthylium
  • Xanthylium, 9-[2-(ethoxycarbonyl)phenyl]-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatesilicate
  • RHQ
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatephosphate
  • Xanthylium, 9-[2-(ethoxycarbonyl)phenyl]-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatephosphate
  • rhodamine 6G(1+)
  • EINECS 263-793-4
  • CCRIS 6093
  • Rhodamine 590
  • EINECS 235-424-7
  • EINECS 263-795-5
  • starbld0007964
  • SCHEMBL574881
  • CHEBI:52895
  • DTXSID70872498
  • ZINC38609386
  • AKOS024573759
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-(ethylimino)-2,7-dimethyl-
  • NCGC00249078-01
  • Benzoic acid, 2-(6-(ethylamino)-3-(ethylimino)-2,7-dimethyl-3H-xanthen-9-yl)-, ethyl ester, compd. with phosphomolybdic acid
  • Benzoic acid, 2-(6-(ethylamino)-3-(ethylimino)-2,7-dimethyl-3H-xanthen-9-yl)-, ethyl ester, compound with phosphomolybdic acid
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatephosphate (1:?)
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatesilicate (1:?)
  • Xanthylium, 9-(2-(ethoxycarbonyl)phenyl)-3,6-bis(ethylamino)-2,7-dimethyl-, molybdatetungstatephosphate
  • Q27123675
  • Q27465041
  • 9-[2-(ethoxycarbonyl)phenyl]-3,6-bis(ethylamino)-2,7-dimethylxanthenium
  • 2,7-Dimethyl-3,6-bis(ethylamino)-9-[2-(ethoxycarbonyl)phenyl]-3H-xanthene-3-ylium
  • N-[(3E)-9-[2-(ethoxycarbonyl)phenyl]-6-(ethylamino)-2,7-dimethyl-3H-xanthen-3-ylidene]ethanaminium
  • N-[(3Z)-9-[2-(ethoxycarbonyl)phenyl]-6-(ethylamino)-2,7-dimethyl-3H-xanthen-3-ylidene]ethanaminium
  • N-[9-[2-(ethoxycarbonyl)phenyl]-6-(ethylamino)-2,7-dimethyl-3H-xanthen-3-yliden]-1-ethanaminium

IUPAC Name: [9-(2-ethoxycarbonylphenyl)-6-(ethylamino)-2,7-dimethylxanthen-3-ylidene]-ethylazanium
InChI: InChI=1S/C28H30N2O3/c1-6-29-23-15-25-21(13-17(23)4)27(19-11-9-10-12-20(19)28(31)32-8-3)22-14-18(5)24(30-7-2)16-26(22)33-25/h9-16,29H,6-8H2,1-5H3/p+1
Canonical SMILES: CCNC1=CC2=C(C=C1C)C(=C3C=C(C(=[NH+]CC)C=C3O2)C)C4=CC=CC=C4C(=O)OCC

Property NameProperty Value
Molecular Weight443.6
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count4
Rotatable Bond Count7
Exact Mass443.2334679
Monoisotopic Mass443.2334679
Topological Polar Surface Area61.5 Ų
Heavy Atom Count33
Formal Charge1
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently-Bonded Unit Count1
Compound Is CanonicalizedYes
[Data From:PubChem]