Basic Orange 31

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  • Identifiers

    CAS number
    97404-02-9

    Molecular formula
    C11H14ClN5

    SMILES
    CN1C=C[N+](=C1N=NC2=CC=C(C=C2)N)C.[Cl-]

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Roasted 45.62%
    Burnt 35.83%
    Meaty 35.66%
    Nutty 32.29%
    Cooked 27.37%
    Musty 25.53%
    Grape 25.34%
    Bitter 24.55%
    Animal 24.23%
    Odorless 24.13%

     

    Flavor
    Bitter 69.93%
    Odorless 29.11%
    Roasted 27.91%
    Bread crust 22.5%
    Very strong 22.08%
    Nutty 21.97%
    Mild 21.94%
    Nitrile 21.93%
    Roasted peanuts 21.73%
    Scallion 21.62%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    3.72 (weak acid)

    Molecular weight
    251.71 g/mol

    Flash point

    • 183.94 ˚C est.

  • Synonyms

    • Basic Orange 31
    • 97404-02-9
    • 2-[(4-AMINOPHENYL)AZO]-1,3-DIMETHYL-1H-IMIDAZOLIUM CHLORIDE
    • UNII-O1JIQ710E2
    • O1JIQ710E2
    • COLOREX BO31
    • EINECS 306-764-4
    • 2-((4-Aminophenyl)azo)-1,3-dimethyl-1H-imidazolium chloride
    • VIBRACOLOR FLAME ORANGE
    • DTXSID40874045
    • 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)
    • RefChem:116619
    • BASIC ORANGE 31 [INCI]
    • DTXCID501012180
    • 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
    • SCHEMBL334056
    • SCHEMBL334057
    • SCHEMBL1435730
    • MSK5900
    • FA152224
    • F84235
    • Q27285211
    • 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
    • 1016649-32-3
    • 97404-02-9

  • Applications

    Basic Orange 31 (CAS 97404-02-9), a cationic azo dye, is primarily used as a colorant for textiles, especially acrylic fibers, and is also employed for dyeing paper and leather finishes. It further serves as a colorant in inks and coatings and can be used to pigment polymer formulations in plastics and related materials, while also acting as an intermediate in the synthesis of other dyes and colorants.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 124.79
    methanol 232.96
    isopropanol 54.21
    water 11.19
    ethyl acetate 83.42
    n-propanol 81.53
    acetone 87.98
    n-butanol 68.28
    acetonitrile 111.02
    DMF 253.49
    toluene 53.28
    isobutanol 46.05
    1,4-dioxane 187.15
    methyl acetate 87.31
    THF 310.57
    2-butanone 79.08
    n-pentanol 46.13
    sec-butanol 43.39
    n-hexane 0.6
    ethylene glycol 65.65
    NMP 82.76
    cyclohexane 2.08
    DMSO 259.93
    n-butyl acetate 28.52
    n-octanol 5.19
    chloroform 287.8
    n-propyl acetate 29.47
    acetic acid 293.73
    dichloromethane 329.99
    cyclohexanone 106.05
    propylene glycol 62.6
    isopropyl acetate 28.58
    DMAc 229.25
    2-ethoxyethanol 174.12
    isopentanol 46.31
    n-heptane 0.94
    ethyl formate 132.22
    1,2-dichloroethane 135.73
    n-hexanol 29.63
    2-methoxyethanol 418.48
    isobutyl acetate 19.21
    tetrachloromethane 21.3
    n-pentyl acetate 13.45
    transcutol 181.02
    n-heptanol 13.08
    ethylbenzene 9.8
    MIBK 25.58
    2-propoxyethanol 114.22
    tert-butanol 50.39
    MTBE 22.9
    2-butoxyethanol 50.73
    propionic acid 91.35
    o-xylene 18.64
    formic acid 406.21
    diethyl ether 30.05
    m-xylene 20.7
    p-xylene 18.41
    chlorobenzene 76.54
    dimethyl carbonate 53.15
    n-octane 0.39
    formamide 585.96
    cyclopentanone 149.66
    2-pentanone 52.51
    anisole 42.58
    cyclopentyl methyl ether 58.24
    gamma-butyrolactone 201.11
    1-methoxy-2-propanol 158.92
    pyridine 258.96
    3-pentanone 39.0
    furfural 316.45
    n-dodecane 0.33
    diethylene glycol 142.73
    diisopropyl ether 4.23
    tert-amyl alcohol 36.93
    acetylacetone 75.76
    n-hexadecane 0.38
    acetophenone 48.31
    methyl propionate 78.17
    isopentyl acetate 27.28
    trichloroethylene 348.2
    n-nonanol 5.96
    cyclohexanol 41.49
    benzyl alcohol 70.68
    2-ethylhexanol 12.96
    isooctanol 9.9
    dipropyl ether 10.99
    1,2-dichlorobenzene 54.23
    ethyl lactate 27.21
    propylene carbonate 100.89
    n-methylformamide 236.51
    2-pentanol 24.25
    n-pentane 0.92
    1-propoxy-2-propanol 48.22
    1-methoxy-2-propyl acetate 48.75
    2-(2-methoxypropoxy) propanol 36.44
    mesitylene 7.92
    ε-caprolactone 88.93
    p-cymene 6.69
    epichlorohydrin 330.11
    1,1,1-trichloroethane 76.81
    2-aminoethanol 126.19
    morpholine-4-carbaldehyde 182.3
    sulfolane 162.3
    2,2,4-trimethylpentane 0.77
    2-methyltetrahydrofuran 115.78
    n-hexyl acetate 12.18
    isooctane 0.44
    2-(2-butoxyethoxy)ethanol 57.97
    sec-butyl acetate 16.25
    tert-butyl acetate 25.24
    decalin 0.91
    glycerin 133.21
    diglyme 123.6
    acrylic acid 128.1
    isopropyl myristate 5.34
    n-butyric acid 129.59
    acetyl acetate 54.37
    di(2-ethylhexyl) phthalate 14.71
    ethyl propionate 24.68
    nitromethane 426.92
    1,2-diethoxyethane 34.91
    benzonitrile 71.61
    trioctyl phosphate 7.82
    1-bromopropane 33.7
    gamma-valerolactone 262.52
    n-decanol 4.8
    triethyl phosphate 17.58
    4-methyl-2-pentanol 13.38
    propionitrile 68.2
    vinylene carbonate 135.97
    1,1,2-trichlorotrifluoroethane 263.03
    DMS 24.72
    cumene 6.71
    2-octanol 5.09
    2-hexanone 26.72
    octyl acetate 8.36
    limonene 8.23
    1,2-dimethoxyethane 169.01
    ethyl orthosilicate 16.88
    tributyl phosphate 9.64
    diacetone alcohol 50.29
    N,N-dimethylaniline 22.24
    acrylonitrile 123.55
    aniline 116.35
    1,3-propanediol 175.13
    bromobenzene 62.89
    dibromomethane 130.95
    1,1,2,2-tetrachloroethane 215.92
    2-methyl-cyclohexyl acetate 21.52
    tetrabutyl urea 12.26
    diisobutyl methanol 6.62
    2-phenylethanol 49.06
    styrene 16.26
    dioctyl adipate 12.23
    dimethyl sulfate 75.88
    ethyl butyrate 23.36
    methyl lactate 61.43
    butyl lactate 17.81
    diethyl carbonate 21.96
    propanediol butyl ether 29.83
    triethyl orthoformate 21.72
    p-tert-butyltoluene 6.15
    methyl 4-tert-butylbenzoate 28.28
    morpholine 241.08
    tert-butylamine 19.44
    n-dodecanol 3.82
    dimethoxymethane 174.78
    ethylene carbonate 94.33
    cyrene 53.66
    2-ethoxyethyl acetate 33.94
    2-ethylhexyl acetate 19.05
    1,2,4-trichlorobenzene 71.78
    4-methylpyridine 176.93
    dibutyl ether 5.21
    2,6-dimethyl-4-heptanol 6.62
    DEF 75.29
    dimethyl isosorbide 63.99
    tetrachloroethylene 132.42
    eugenol 36.7
    triacetin 22.78
    span 80 29.2
    1,4-butanediol 59.8
    1,1-dichloroethane 96.47
    2-methyl-1-pentanol 36.73
    methyl formate 195.43
    2-methyl-1-butanol 42.98
    n-decane 0.44
    butyronitrile 71.65
    3,7-dimethyl-1-octanol 6.96
    1-chlorooctane 2.51
    1-chlorotetradecane 1.34
    n-nonane 0.35
    undecane 0.38
    tert-butylcyclohexane 0.75
    cyclooctane 0.65
    cyclopentanol 56.31
    tetrahydropyran 96.45
    tert-amyl methyl ether 17.58
    2,5,8-trioxanonane 77.81
    1-hexene 3.62
    2-isopropoxyethanol 70.85
    2,2,2-trifluoroethanol 144.43
    methyl butyrate 43.9

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction