Green rust

Green rust is a generic name for various green crystalline chemical compounds containing iron(II) and iron(III) cations, the hydroxide (HO−
) anion, and another anion such as carbonate (CO2−
3), chloride (Cl−
), or sulfate (SO2−
4), in a layered double hydroxide structure. The most studied varieties are

  • carbonate green rust – GR(CO2−
    3    ): [Fe2+
    4    Fe3+
    2    (HO−
    )12]2+ · [CO2−
    3    ·2H
    2    O    ]2−.
  • chloride green rust – GR(Cl−
    ): [Fe2+
    3    Fe3+
    (HO−
    )8]+ · [Cl−
    ·nH
    2    O    ]−.
  • sulfate green rust – GR(SO2−
    4    ): [Fe2+
    4    Fe3+
    2    (HO−
    )12]2+ · [SO2−
    4    ·2H
    2    O    ]2−.

Other varieties reported in the literature are bromide Br−
, fluoride F−
, iodide I−
, nitrate NO−
3, and selenate.

Green rust was first recognized as a corrosion crust on iron and steel surfaces. It occurs in nature as the mineral fougerite.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.