Copper oxide (Cu2O)

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  • Identifiers

    CAS number
    1317-39-1

    Molecular formula
    Cu2O

    SMILES
    O=[Cu].[Cu]

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 93.44%
    Pungent 23.44%
    Sharp 21.06%
    Burnt 16.36%
    Sour 15.77%
    Bitter 15.68%
    Ethereal 10.78%
    Caramellic 10.22%
    Fermented 9.93%
    Malty 9.48%

     

    Flavor
    Odorless 54.19%
    Pungent 38.13%
    Bitter 28.3%
    Rotten 26.4%
    Vinegar 25.71%
    Formyl 25.55%
    Mustard 23.43%
    Decomposing cabbage 20.81%
    Sulfur 20.72%
    Almond 20.64%

     

  • Properties

    pKa est.
    -2.82 (strong acid)

    Molecular weight
    143.09 g/mol

    Melting point expt.

    • 1235 °C
    • 1232 °C

    Boiling point

    • Decomp at 1800 °C

    Flash point

    • -7.65 ˚C est.

    Solubility expt.

    • Crimson, scarlet, vermilion, deep or brownish-red, secondary mineral; adamantine or dull luster; brownish red streak; sol in nitric and concentrated hydrochloric acids; specific gravity: 5.85-6.15; Mohs hardness: 3.5-4 /Cuprite/
    • Soluble in ammonium hydroxide; in hydrochloric acid forming copper(I) chloride which dissolves in excess hydrochloric acid; with dil sulfuric acid or dil nitric acid the cupric salt is formed and half copper is pptd as the metal.
    • PRACTICALLY INSOLUBLE IN ORGANIC SOLVENTS; SOL IN DILUTE MINERAL ACIDS, SOLN OF AMMONIA & ITS SALTS.
    • Insoluble in water
    • Soluble in acids and ammonium hydroxide; insoluble in water
    • For more Solubility (Complete) data for COPPER (I) OXIDE (6 total), please visit the HSDB record page.
    • Solubility in water, g/l at 20 °C:

  • Synonyms

    • (cupriooxy)copper
    • RefChem:1082154
    • 1317-39-1
    • Brown copper oxide
    • Caocobre
    • Caswell No. 266
    • CI 77402
    • Copox
    • copper (I) oxide
    • Copper hemioxide
    • Copper Nordox
    • Copper oxide (Cu2O)
    • Copper oxide, red
    • Copper protoxide
    • Copper Sandoz
    • Copper sardez
    • Copper suboxide
    • Copper(1+) oxide
    • Copper(I) oxide
    • Copper-sandoz
    • Cupper oxide
    • Cupramar
    • Cuprocide
    • Cuprous Oxide Type Two
    • Cuprous Oxide, AA Grade
    • Dicopper monoxide
    • Fungimar
    • Kupferoxydul
    • Kuprite
    • Oleo Nordox
    • Oleocuivre
    • Oxyde cuivreux
    • Perecot
    • Perenex
    • Purple Copp 92
    • Purple Copp 97
    • Purple Copp 97N
    • Red Copp 92
    • Red Copp 97
    • Red Copp 97N
    • Red copper oxide
    • Yellow compound
    • Yellow cuprocide
    • copper;oxocopper
    • 1317-39-1

  • Applications

    Copper oxide (Cu2O, CAS 1317-39-1) is primarily used as a pigment in ceramics, paints, and glass, imparting a reddish tone and providing color stability in glazes and coatings. It also serves as a catalyst or catalyst precursor for various oxidation reactions and some polymerization processes. Because of its p-type semiconductor nature, Cu2O is studied for electronics and photoelectrochemical applications, including sensors and energy storage-related devices. In coatings and inks, it functions as a colorant and functional filler to adjust shade and durability. Additionally, it can act as a precursor to synthesize other copper compounds and is considered in energy storage and photoelectrochemical systems.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1024.8
    methanol 1511.15
    isopropanol 771.61
    water 524.77
    ethyl acetate 203.71
    n-propanol 641.14
    acetone 691.83
    n-butanol 497.8
    acetonitrile 405.09
    DMF 2652.07
    toluene 56.75
    isobutanol 400.83
    1,4-dioxane 599.31
    methyl acetate 304.05
    THF 734.81
    2-butanone 347.7
    n-pentanol 371.43
    sec-butanol 508.69
    n-hexane 40.91
    ethylene glycol 1103.7
    NMP 925.67
    cyclohexane 46.12
    DMSO 1981.48
    n-butyl acetate 117.87
    n-octanol 191.74
    chloroform 174.23
    n-propyl acetate 164.83
    acetic acid 659.42
    dichloromethane 237.68
    cyclohexanone 268.42
    propylene glycol 623.04
    isopropyl acetate 134.56
    DMAc 1240.99
    2-ethoxyethanol 740.18
    isopentanol 343.46
    n-heptane 45.12
    ethyl formate 228.4
    1,2-dichloroethane 226.68
    n-hexanol 236.72
    2-methoxyethanol 1394.55
    isobutyl acetate 93.75
    tetrachloromethane 55.82
    n-pentyl acetate 124.83
    transcutol 928.03
    n-heptanol 169.23
    ethylbenzene 45.65
    MIBK 173.07
    2-propoxyethanol 489.73
    tert-butanol 735.59
    MTBE 313.71
    2-butoxyethanol 334.71
    propionic acid 373.3
    o-xylene 67.31
    formic acid 841.61
    diethyl ether 379.22
    m-xylene 59.09
    p-xylene 50.95
    chlorobenzene 59.07
    dimethyl carbonate 216.76
    n-octane 23.87
    formamide 1149.82
    cyclopentanone 404.47
    2-pentanone 292.44
    anisole 162.51
    cyclopentyl methyl ether 301.13
    gamma-butyrolactone 400.44
    1-methoxy-2-propanol 799.42
    pyridine 261.1
    3-pentanone 218.68
    furfural 382.05
    n-dodecane 22.75
    diethylene glycol 699.43
    diisopropyl ether 111.14
    tert-amyl alcohol 484.39
    acetylacetone 252.69
    n-hexadecane 23.33
    acetophenone 147.26
    methyl propionate 261.0
    isopentyl acetate 97.17
    trichloroethylene 232.73
    n-nonanol 163.2
    cyclohexanol 295.68
    benzyl alcohol 181.7
    2-ethylhexanol 124.12
    isooctanol 126.39
    dipropyl ether 166.06
    1,2-dichlorobenzene 64.45
    ethyl lactate 147.14
    propylene carbonate 163.12
    n-methylformamide 1073.23
    2-pentanol 362.42
    n-pentane 74.97
    1-propoxy-2-propanol 329.12
    1-methoxy-2-propyl acetate 154.03
    2-(2-methoxypropoxy) propanol 266.31
    mesitylene 50.03
    ε-caprolactone 222.9
    p-cymene 45.18
    epichlorohydrin 411.42
    1,1,1-trichloroethane 105.56
    2-aminoethanol 1026.19
    morpholine-4-carbaldehyde 914.62
    sulfolane 498.81
    2,2,4-trimethylpentane 31.84
    2-methyltetrahydrofuran 401.82
    n-hexyl acetate 159.15
    isooctane 25.62
    2-(2-butoxyethoxy)ethanol 397.53
    sec-butyl acetate 100.77
    tert-butyl acetate 151.18
    decalin 22.29
    glycerin 924.05
    diglyme 616.4
    acrylic acid 378.6
    isopropyl myristate 82.16
    n-butyric acid 295.44
    acetyl acetate 108.22
    di(2-ethylhexyl) phthalate 77.77
    ethyl propionate 135.91
    nitromethane 785.34
    1,2-diethoxyethane 265.11
    benzonitrile 121.78
    trioctyl phosphate 76.03
    1-bromopropane 140.25
    gamma-valerolactone 500.25
    n-decanol 133.33
    triethyl phosphate 69.81
    4-methyl-2-pentanol 185.0
    propionitrile 260.54
    vinylene carbonate 155.34
    1,1,2-trichlorotrifluoroethane 425.25
    DMS 121.25
    cumene 43.81
    2-octanol 130.39
    2-hexanone 191.13
    octyl acetate 107.92
    limonene 71.76
    1,2-dimethoxyethane 770.11
    ethyl orthosilicate 71.7
    tributyl phosphate 75.77
    diacetone alcohol 292.55
    N,N-dimethylaniline 172.7
    acrylonitrile 316.68
    aniline 164.59
    1,3-propanediol 867.12
    bromobenzene 42.01
    dibromomethane 160.89
    1,1,2,2-tetrachloroethane 209.95
    2-methyl-cyclohexyl acetate 84.43
    tetrabutyl urea 134.07
    diisobutyl methanol 93.08
    2-phenylethanol 143.79
    styrene 57.95
    dioctyl adipate 108.55
    dimethyl sulfate 335.26
    ethyl butyrate 105.72
    methyl lactate 284.04
    butyl lactate 132.88
    diethyl carbonate 72.78
    propanediol butyl ether 358.38
    triethyl orthoformate 90.55
    p-tert-butyltoluene 48.12
    methyl 4-tert-butylbenzoate 159.71
    morpholine 753.88
    tert-butylamine 431.1
    n-dodecanol 110.83
    dimethoxymethane 920.08
    ethylene carbonate 135.57
    cyrene 238.28
    2-ethoxyethyl acetate 167.89
    2-ethylhexyl acetate 77.55
    1,2,4-trichlorobenzene 80.62
    4-methylpyridine 207.61
    dibutyl ether 132.23
    2,6-dimethyl-4-heptanol 93.08
    DEF 524.05
    dimethyl isosorbide 298.53
    tetrachloroethylene 186.2
    eugenol 202.06
    triacetin 145.9
    span 80 239.4
    1,4-butanediol 454.95
    1,1-dichloroethane 161.1
    2-methyl-1-pentanol 257.05
    methyl formate 664.97
    2-methyl-1-butanol 328.95
    n-decane 30.85
    butyronitrile 234.36
    3,7-dimethyl-1-octanol 142.65
    1-chlorooctane 75.06
    1-chlorotetradecane 41.72
    n-nonane 30.66
    undecane 26.01
    tert-butylcyclohexane 23.07
    cyclooctane 22.91
    cyclopentanol 403.31
    tetrahydropyran 350.27
    tert-amyl methyl ether 266.6
    2,5,8-trioxanonane 463.25
    1-hexene 96.9
    2-isopropoxyethanol 458.26
    2,2,2-trifluoroethanol 370.37
    methyl butyrate 182.53

    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