Nitrogen trioxide

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  • Identifiers

    CAS number
    10544-73-7

    Molecular formula
    N2O3

    SMILES
    N(=O)[N+](=O)[O-]

    Safety labels

    Oxidizer
    Oxidizer

    Compressed Gas
    Compressed Gas

    Corrosive
    Corrosive

    Acute Toxic
    Acute Toxic

  • Odor profile

    Odorless 73.81%
    Caramellic 26.24%
    Burnt 25.86%
    Sour 23.01%
    Sharp 21.45%
    Pungent 20.13%
    Buttery 18.03%
    Ethereal 17.09%
    Sweet 16.06%
    Bitter 13.95%

    Scent© AI

  • Properties

    XLogP3-AA
    -0.1

    Molecular weight
    76.012 g/mol

    Boiling point

    • 38 °F

    Flash point est.
    51.04 ˚C

  • Synonyms

    • Dinitrogen trioxide
    • N-oxonitramide
    • NITROGEN TRIOXIDE
    • Nitrogen oxide (N2O3)
    • 10544-73-7
    • EINECS 234-128-5
    • UN2421
    • UNII-16E0524PXI
    • O2NNO
    • DINITROGEN TRIOXIDE [MI]
    • DTXSID7065120
    • CHEBI:29799
    • 16E0524PXI
    • trioxido-1kappa(2)O,2kappaO-dinitrogen(N--N)
    • Nitrous anhydride
    • nitrogen sesquioxide
    • NITROGEN TRIOXIDE (NITROGEN OXIDES)
    • NITROGEN TRIOXIDE {NITROGEN OXIDES}
    • N2O3
    • Nitrogen trioxide 10% by volume or more
    • Nitrogen oxide (NO3)
    • DTXCID9032959
    • NITROGEN TRIOXIDE (N2O3)
    • Nitrogen trioxide [UN2421] [Poison gas]
    • NS00051971
    • Q407833
    • 234-128-5

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 49.23
    methanol 105.89
    isopropanol 26.83
    water 33.16
    ethyl acetate 17.93
    n-propanol 27.77
    acetone 79.59
    n-butanol 21.03
    acetonitrile 60.06
    DMF 401.24
    toluene 3.82
    isobutanol 15.83
    1,4-dioxane 40.31
    methyl acetate 39.81
    THF 49.23
    2-butanone 43.19
    n-pentanol 16.02
    sec-butanol 20.49
    n-hexane 1.17
    ethylene glycol 69.5
    NMP 249.31
    cyclohexane 3.37
    DMSO 898.59
    n-butyl acetate 11.07
    n-octanol 9.26
    chloroform 7.0
    n-propyl acetate 12.6
    acetic acid 70.13
    dichloromethane 19.23
    cyclohexanone 37.41
    propylene glycol 29.21
    isopropyl acetate 8.64
    DMAc 282.84
    2-ethoxyethanol 62.39
    isopentanol 16.71
    n-heptane 2.91
    ethyl formate 29.34
    1,2-dichloroethane 25.1
    n-hexanol 10.9
    2-methoxyethanol 118.37
    isobutyl acetate 4.49
    tetrachloromethane 2.25
    n-pentyl acetate 8.34
    transcutol 97.81
    n-heptanol 7.52
    ethylbenzene 2.47
    MIBK 10.84
    2-propoxyethanol 33.66
    tert-butanol 29.11
    MTBE 15.4
    2-butoxyethanol 20.71
    propionic acid 35.92
    o-xylene 6.06
    formic acid 126.75
    diethyl ether 17.01
    m-xylene 3.41
    p-xylene 2.99
    chlorobenzene 4.12
    dimethyl carbonate 23.64
    n-octane 1.25
    formamide 209.3
    cyclopentanone 46.3
    2-pentanone 24.2
    anisole 8.79
    cyclopentyl methyl ether 16.57
    gamma-butyrolactone 57.68
    1-methoxy-2-propanol 58.19
    pyridine 35.1
    3-pentanone 23.39
    furfural 67.94
    n-dodecane 1.04
    diethylene glycol 56.44
    diisopropyl ether 4.13
    tert-amyl alcohol 22.62
    acetylacetone 28.83
    n-hexadecane 1.13
    acetophenone 15.6
    methyl propionate 29.59
    isopentyl acetate 7.64
    trichloroethylene 21.71
    n-nonanol 8.23
    cyclohexanol 17.81
    benzyl alcohol 16.4
    2-ethylhexanol 6.82
    isooctanol 5.65
    dipropyl ether 10.05
    1,2-dichlorobenzene 4.48
    ethyl lactate 14.56
    propylene carbonate 18.97
    n-methylformamide 167.98
    2-pentanol 12.49
    n-pentane 2.31
    1-propoxy-2-propanol 23.15
    1-methoxy-2-propyl acetate 14.9
    2-(2-methoxypropoxy) propanol 26.99
    mesitylene 2.97
    ε-caprolactone 31.93
    p-cymene 3.67
    epichlorohydrin 49.44
    1,1,1-trichloroethane 5.05
    2-aminoethanol 57.92
    morpholine-4-carbaldehyde 148.89
    sulfolane 132.95
    2,2,4-trimethylpentane 1.08
    2-methyltetrahydrofuran 26.99
    n-hexyl acetate 10.07
    isooctane 0.65
    2-(2-butoxyethoxy)ethanol 34.76
    sec-butyl acetate 5.53
    tert-butyl acetate 8.98
    decalin 0.99
    glycerin 56.79
    diglyme 69.09
    acrylic acid 49.89
    isopropyl myristate 5.19
    n-butyric acid 25.12
    acetyl acetate 10.54
    di(2-ethylhexyl) phthalate 6.35
    ethyl propionate 10.81
    nitromethane 181.13
    1,2-diethoxyethane 19.94
    benzonitrile 14.65
    trioctyl phosphate 5.51
    1-bromopropane 9.95
    gamma-valerolactone 78.43
    n-decanol 6.56
    triethyl phosphate 6.69
    4-methyl-2-pentanol 6.65
    propionitrile 28.04
    vinylene carbonate 20.93
    1,1,2-trichlorotrifluoroethane 59.9
    DMS 12.83
    cumene 2.13
    2-octanol 5.29
    2-hexanone 14.11
    octyl acetate 7.55
    limonene 6.21
    1,2-dimethoxyethane 70.32
    ethyl orthosilicate 5.92
    tributyl phosphate 6.06
    diacetone alcohol 27.05
    N,N-dimethylaniline 12.04
    acrylonitrile 54.68
    aniline 12.95
    1,3-propanediol 49.41
    bromobenzene 2.84
    dibromomethane 11.38
    1,1,2,2-tetrachloroethane 18.65
    2-methyl-cyclohexyl acetate 7.06
    tetrabutyl urea 13.62
    diisobutyl methanol 5.2
    2-phenylethanol 10.96
    styrene 3.06
    dioctyl adipate 9.9
    dimethyl sulfate 59.6
    ethyl butyrate 10.03
    methyl lactate 32.59
    butyl lactate 10.92
    diethyl carbonate 6.89
    propanediol butyl ether 22.26
    triethyl orthoformate 8.08
    p-tert-butyltoluene 3.52
    methyl 4-tert-butylbenzoate 14.58
    morpholine 65.83
    tert-butylamine 14.12
    n-dodecanol 5.55
    dimethoxymethane 79.95
    ethylene carbonate 17.06
    cyrene 28.52
    2-ethoxyethyl acetate 14.19
    2-ethylhexyl acetate 5.71
    1,2,4-trichlorobenzene 6.43
    4-methylpyridine 25.77
    dibutyl ether 7.97
    2,6-dimethyl-4-heptanol 5.2
    DEF 72.29
    dimethyl isosorbide 32.89
    tetrachloroethylene 15.01
    eugenol 17.76
    triacetin 15.13
    span 80 17.36
    1,4-butanediol 28.17
    1,1-dichloroethane 8.58
    2-methyl-1-pentanol 11.96
    methyl formate 102.61
    2-methyl-1-butanol 15.69
    n-decane 1.46
    butyronitrile 19.84
    3,7-dimethyl-1-octanol 7.1
    1-chlorooctane 3.52
    1-chlorotetradecane 1.95
    n-nonane 1.46
    undecane 1.21
    tert-butylcyclohexane 0.7
    cyclooctane 1.47
    cyclopentanol 20.75
    tetrahydropyran 22.25
    tert-amyl methyl ether 14.42
    2,5,8-trioxanonane 52.96
    1-hexene 3.0
    2-isopropoxyethanol 30.76
    2,2,2-trifluoroethanol 41.57
    methyl butyrate 18.09

    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