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  • Cadmium compounds
  • Acetates
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    Cadmium acetate

    Topic: Chemistry

     From Handwiki - Reading time: 5 min
    Cadmium acetate
    Names
    IUPAC name
    Cadmium acetate
    Other names
    Cadmium diacetate
    Identifiers
    3D model (JSmol)
    ChemSpider
    EC Number
    • 208-853-2
    RTECS number
    • AF7505000
    UNII
    UN number 2570
    Properties
    Cd(CH3COO)2 (anhydrous)
    Cd(CH3COO)2·2H2O (dihydrate)
    Molar mass 230.500 g/mol (anhydrous)
    266.529 g/mol (dihydrate)
    Appearance colorless crystals (anhydrous)
    white crystals (dihydrate)
    Odor acetic acid
    Density 2.341 g/cm3 (anhydrous)
    2.01 g/cm3 (dihydrate)
    Melting point 255 °C (491 °F; 528 K) (anhydrous) dihydrate decomposes at 130°C [1]
    soluble (anhydrous), very soluble (dihydrate)
    Solubility soluble in methanol, ethanol (anhydrous)
    soluble in ethanol (dihydrate)
    -83.7·10−6 cm3/mol
    Structure
    monoclinic
    Hazards
    GHS pictograms GHS07: HarmfulGHS09: Environmental hazardGHS06: Toxic
    GHS Signal word Warning
    H302, H312, H332, H410
    P261, P264, P270, P271, P273, P280, P301+312, P302+352, P304+312, P304+340, P312, P322, P330, P363, P391, P501
    NFPA 704 (fire diamond)
    NFPA 704 four-colored diamondFlammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
    1
    3
    0
    NIOSH (US health exposure limits):
    PEL (Permissible)
    		 [1910.1027] TWA 0.005 mg/m3 (as Cd)[2]
    REL (Recommended)
    		 Ca[2]
    IDLH (Immediate danger)
    		 Ca [9 mg/m3 (as Cd)][2]
    Related compounds
    Other anions
    		 Cadmium fluoride
    Cadmium chloride
    Cadmium bromide
    Cadmium iodide
    Other cations
    		 Zinc acetate
    Mercury(II) acetate
    Silver acetate
    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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    Infobox references

    Cadmium acetate is the chemical compound with the formula Cd(O
    2    CCH
    3    )
    2    (H
    2    O)
    2    . The compound is marketed both as the anhydrous form and as a dihydrate, both of which are white or colorless. Only the dihydrate has been verified by X-ray crystallography.

    Preparation, reactions, and uses

    It forms by treating cadmium oxide with acetic acid:[3][4]

    CdO + 2 CH
    3    CO
    2    H + H
    2    O → Cd(O
    2    CCH
    3    )
    2    (H
    2    O)
    2

    It can also be prepared by treating cadmium nitrate with acetic anhydride.[5]

    Cadmium acetate has few applications. By reaction with trioctylphosphine selenide, it has often been used as a precursor to cadmium selenide and related semiconductors.[6]

    Structure of the dihydrate

    Fragment of the structure of cadmium diacetate dihydrate. Legend: red = O, black = C, blue = Cd.

    Unlike the coordination geometry of zinc in zinc diacetate dihydrate, cadmium is seven coordinate in Cd(O
    2    CCH
    3    )
    2    (H
    2    O)
    2    .[7] It is a coordination polymer, featuring acetate ligands interconnecting cadmium centers.

    Safety

    Cadmium compounds are considered Group 1 carcinogens by the IARC.

    References

    1. ↑ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 447. ISBN 0-8493-0594-2. 
    2. ↑ 2.0 2.1 2.2 NIOSH Pocket Guide to Chemical Hazards. "#0087". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0087.html. 
    3. ↑ Gangolli, S. (1999). The Dictionary of Substances and Their Effects. London: Royal Society of Chemistry. pp. 12–13. ISBN 9780854048137. https://books.google.com/books?id=s4YittJrOsAC&dq=%22Cadmium+acetate%22&pg=PA12. Retrieved 2009-03-29. 
    4. ↑ Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill Professional. pp. 143–144. ISBN 0-07-049439-8. https://books.google.com/books?id=Xqj-TTzkvTEC&dq=%22Cobalt+hydroxide%22+OR+%22Cobalt(II)+hydroxide%22&pg=PA243. Retrieved 2009-03-29. 
    5. ↑ F. Wagenknecht; R. Juza (1963). "Cadmium acetate". in G. Brauer. Handbook of Preparative Inorganic Chemistry, 2nd Ed.. 2. NY, NY: Academic Press. pp. 1105. 
    6. ↑ García-Rodríguez, Raúl; Hendricks, Mark P.; Cossairt, Brandi M.; Liu, Haitao; Owen, Jonathan S. (2013). "Conversion Reactions of Cadmium Chalcogenide Nanocrystal Precursors". Chemistry of Materials 25 (8): 1233–1249. doi:10.1021/cm3035642. 
    7. ↑ Harrison, W.; Trotter, J. (1972). "Crystal and molecular structure of cadmium diacetate dihydrate". Journal of the Chemical Society, Dalton Transactions (8–9): 956. doi:10.1039/dt9720000956. 



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