Sodium thiocyanate

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  • Identifiers

    CAS number
    540-72-7

    Molecular formula
    CNNaS

    SMILES
    C(#N)[S-].[Na+]

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Sulfurous 45.78%
    Odorless 38.72%
    Meaty 29.39%
    Garlic 28.1%
    Onion 26.22%
    Pungent 23.94%
    Burnt 20.96%
    Alliaceous 20.1%
    Fishy 19.78%
    Savory 19.38%

     

    Flavor
    Bitter 47.31%
    Odorless 31.38%
    Rotten 19.5%
    Nitrile 19.26%
    Formyl 19.12%
    Mousy 18.19%
    Sulfur 17.7%
    Decomposing cabbage 17.5%
    Penetrating 16.94%
    Shrimp 16.87%

     

    Odor impact est.
    High

  • Properties

    pKa est.
    2.67 (strong acid)

    Molecular weight
    81.07 g/mol

    Melting point expt.

    • 572 °F (USCG, 1999)
    • ~300 °C

    Flash point

    • 21.14 ˚C est.

    Solubility expt.

    • Solubility in water, g/100ml at 21 °C: 139

  • Synonyms

    • SODIUM THIOCYANATE
    • 540-72-7
    • Sodium rhodanate
    • Sodium rhodanide
    • Thiocyanate sodium
    • Sodium sulfocyanate
    • Thiocyanic acid, sodium salt
    • Scyan
    • NaSCN
    • Haimased
    • Natrium rhodanatum
    • Natrium thiocyanat
    • Sodium thiocyanide
    • Sodium sulfocyanide
    • Natriumrhodanid
    • DTXSID4021343
    • 5W0K9HKA05
    • DTXCID101343
    • CHEBI:30952
    • RefChem:184128
    • 208-754-4
    • 630-465-0
    • sodium;thiocyanate
    • Sodium isothiocyanate
    • Thiocyanate, sodium
    • CHEMBL1644028
    • MFCD00011123
    • Caswell No. 796A
    • Natriumrhodanid [German]
    • CNNaS
    • CAS-540-72-7
    • USAF EK-T-434
    • CCRIS 3967
    • Thiocyanate sodium [NF]
    • EINECS 208-754-4
    • EPA Pesticide Chemical Code 068202
    • UNII-5W0K9HKA05
    • Thiocyanic acid sodium salt (1:1)
    • EC 208-754-4
    • SCHEMBL36260
    • Sodium thiocyanate [WHO-DD]
    • orb1685426
    • orb3025093
    • THIOCYANATE SODIUM [MI]
    • SCHEMBL29349664
    • HMS5085M14
    • Tox21_201621
    • Tox21_302975
    • s6281
    • Thiocyanic acid, sodium salt (1:1)
    • AKOS009128859
    • EBC-153105
    • FS30601
    • NCGC00256614-01
    • NCGC00259170-01
    • DA-57983
    • HY-23119
    • CS-0044699
    • NS00075636
    • Sodium thiocyanate, ACS reagent, >=98.0%
    • Sodium thiocyanate, p.a., ACS reagent, 98%
    • Sodium thiocyanate, SAJ first grade, >=98.0%
    • F493930
    • Q425176
    • Sodium thiocyanate, >=99.99% trace metals basis
    • Sodium thiocyanate, JIS special grade, >=99.0%
    • Sodium thiocyanate, reagent grade, 98-102% (titration)
    • Z247615468
    • Sodium thiocyanate, ACS reagent grade 99.99% trace metals basis
    • 540-72-7

  • Applications

    Sodium thiocyanate (CAS 540-72-7) finds practical use as a source of thiocyanate (SCN−) in organic synthesis, enabling introduction of the thiocyanate group and serving as a precursor to thiourea derivatives, dithiocarbamates, and related compounds used in pharmaceutical and agrochemical applications. In analytical chemistry it is routinely used to furnish SCN− for iron(III)–thiocyanate colorimetric tests, producing the characteristic blood-red complex for metal determination. In hydrometallurgy and mining, sodium thiocyanate is studied as a leaching agent to dissolve gold and copper in cyanide-free processes. It also serves as a building block for polymer and coating chemistries involving thiocyanate functionalities and can act as a ligand in coordination chemistry and catalysis.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 60.32
    methanol 107.08
    isopropanol 45.08
    water 11.5
    ethyl acetate 91.9
    n-propanol 45.03
    acetone 289.32
    n-butanol 34.32
    acetonitrile 190.35
    DMF 624.81
    toluene 41.1
    isobutanol 32.49
    1,4-dioxane 219.71
    methyl acetate 151.0
    THF 215.55
    2-butanone 141.52
    n-pentanol 33.47
    sec-butanol 36.78
    n-hexane 9.77
    ethylene glycol 73.99
    NMP 471.81
    cyclohexane 22.93
    DMSO 695.43
    n-butyl acetate 67.56
    n-octanol 36.21
    chloroform 98.62
    n-propyl acetate 77.06
    acetic acid 143.11
    dichloromethane 110.01
    cyclohexanone 145.31
    propylene glycol 40.5
    isopropyl acetate 55.18
    DMAc 494.98
    2-ethoxyethanol 100.48
    isopentanol 30.74
    n-heptane 17.12
    ethyl formate 77.76
    1,2-dichloroethane 97.36
    n-hexanol 32.85
    2-methoxyethanol 155.51
    isobutyl acetate 46.12
    tetrachloromethane 32.15
    n-pentyl acetate 51.01
    transcutol 296.5
    n-heptanol 24.51
    ethylbenzene 24.76
    MIBK 55.1
    2-propoxyethanol 86.56
    tert-butanol 60.36
    MTBE 63.84
    2-butoxyethanol 59.51
    propionic acid 76.62
    o-xylene 38.37
    formic acid 96.23
    diethyl ether 73.76
    m-xylene 30.46
    p-xylene 36.03
    chlorobenzene 58.35
    dimethyl carbonate 106.03
    n-octane 8.4
    formamide 172.43
    cyclopentanone 207.28
    2-pentanone 90.18
    anisole 72.79
    cyclopentyl methyl ether 87.09
    gamma-butyrolactone 214.27
    1-methoxy-2-propanol 101.66
    pyridine 150.75
    3-pentanone 99.8
    furfural 251.99
    n-dodecane 8.77
    diethylene glycol 126.15
    diisopropyl ether 32.85
    tert-amyl alcohol 46.09
    acetylacetone 169.29
    n-hexadecane 9.63
    acetophenone 85.87
    methyl propionate 103.41
    isopentyl acetate 53.25
    trichloroethylene 154.71
    n-nonanol 32.77
    cyclohexanol 44.4
    benzyl alcohol 53.67
    2-ethylhexanol 28.86
    isooctanol 21.84
    dipropyl ether 57.8
    1,2-dichlorobenzene 59.77
    ethyl lactate 48.59
    propylene carbonate 98.52
    n-methylformamide 204.25
    2-pentanol 28.68
    n-pentane 11.47
    1-propoxy-2-propanol 70.89
    1-methoxy-2-propyl acetate 79.18
    2-(2-methoxypropoxy) propanol 87.28
    mesitylene 26.42
    ε-caprolactone 110.18
    p-cymene 26.6
    epichlorohydrin 164.26
    1,1,1-trichloroethane 88.75
    2-aminoethanol 61.63
    morpholine-4-carbaldehyde 410.89
    sulfolane 316.51
    2,2,4-trimethylpentane 7.53
    2-methyltetrahydrofuran 114.07
    n-hexyl acetate 63.67
    isooctane 6.16
    2-(2-butoxyethoxy)ethanol 101.16
    sec-butyl acetate 45.31
    tert-butyl acetate 65.32
    decalin 11.17
    glycerin 83.96
    diglyme 231.81
    acrylic acid 98.54
    isopropyl myristate 37.23
    n-butyric acid 58.73
    acetyl acetate 92.76
    di(2-ethylhexyl) phthalate 36.15
    ethyl propionate 64.03
    nitromethane 411.92
    1,2-diethoxyethane 108.34
    benzonitrile 80.47
    trioctyl phosphate 27.12
    1-bromopropane 44.82
    gamma-valerolactone 251.19
    n-decanol 28.03
    triethyl phosphate 38.86
    4-methyl-2-pentanol 21.26
    propionitrile 87.22
    vinylene carbonate 101.17
    1,1,2-trichlorotrifluoroethane 179.17
    DMS 100.75
    cumene 20.69
    2-octanol 21.37
    2-hexanone 80.75
    octyl acetate 43.42
    limonene 39.86
    1,2-dimethoxyethane 207.55
    ethyl orthosilicate 36.02
    tributyl phosphate 33.88
    diacetone alcohol 78.76
    N,N-dimethylaniline 72.44
    acrylonitrile 126.92
    aniline 53.04
    1,3-propanediol 64.14
    bromobenzene 56.18
    dibromomethane 70.82
    1,1,2,2-tetrachloroethane 123.1
    2-methyl-cyclohexyl acetate 46.69
    tetrabutyl urea 58.7
    diisobutyl methanol 25.97
    2-phenylethanol 44.87
    styrene 35.97
    dioctyl adipate 55.91
    dimethyl sulfate 220.07
    ethyl butyrate 59.02
    methyl lactate 81.01
    butyl lactate 45.61
    diethyl carbonate 46.75
    propanediol butyl ether 68.59
    triethyl orthoformate 48.55
    p-tert-butyltoluene 26.41
    methyl 4-tert-butylbenzoate 73.98
    morpholine 182.69
    tert-butylamine 37.92
    n-dodecanol 25.78
    dimethoxymethane 210.26
    ethylene carbonate 79.73
    cyrene 89.46
    2-ethoxyethyl acetate 84.37
    2-ethylhexyl acetate 46.25
    1,2,4-trichlorobenzene 75.37
    4-methylpyridine 119.23
    dibutyl ether 50.2
    2,6-dimethyl-4-heptanol 25.97
    DEF 172.04
    dimethyl isosorbide 139.44
    tetrachloroethylene 99.71
    eugenol 76.01
    triacetin 102.59
    span 80 72.19
    1,4-butanediol 41.53
    1,1-dichloroethane 72.68
    2-methyl-1-pentanol 28.51
    methyl formate 179.41
    2-methyl-1-butanol 28.84
    n-decane 11.63
    butyronitrile 60.05
    3,7-dimethyl-1-octanol 33.72
    1-chlorooctane 28.4
    1-chlorotetradecane 17.6
    n-nonane 11.3
    undecane 9.79
    tert-butylcyclohexane 9.58
    cyclooctane 10.49
    cyclopentanol 58.93
    tetrahydropyran 109.68
    tert-amyl methyl ether 52.66
    2,5,8-trioxanonane 183.54
    1-hexene 21.7
    2-isopropoxyethanol 73.53
    2,2,2-trifluoroethanol 85.62
    methyl butyrate 84.78

    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