Green rust

Green rust is a generic name for various green <a href="/facts/Crystal/e2R2mk3E">crystalline</a> <a href="/facts/Chemical_compounds/37FXqqtv">chemical compounds</a> containing iron(II) and iron(III) cations, the <a href="/facts/Hydroxide/zW0wxpWD">hydroxide</a> (OH−) anion, and another anion such as <a href="/facts/Carbonate/FES1QHkN">carbonate</a> (CO2−3), <a href="/facts/Chloride/m9NUaUDR">chloride</a> (Cl−), or <a href="/facts/Sulfate/yuWVxsUf">sulfate</a> (SO2−4), in a <a href="/facts/Layered_double_hydroxide/gWBuQLJx">layered double hydroxide</a> (LDH) structure. The most studied varieties are the following:

<ul><li>carbonate green rust – GR (CO2−3):[Fe2+4Fe3+2(OH−)12]2+ · [CO2−3·2H2O]2−;</li>
<li>chloride green rust – GR (Cl−):[Fe2+3Fe3+(OH−)8]+ · [Cl−·nH2O]−;</li>
<li>sulfate green rust – GR (SO2−4):[Fe2+4Fe3+2(OH−)12]2+ · [SO2−4·2H2O]2−.</li></ul>
Other varieties reported in the literature are <a href="/facts/Bromide/bHSfxGk1">bromide</a> Br−, <a href="/facts/Fluoride/LpqNMzwa">fluoride</a> F−, <a href="/facts/Iodide/JyVRGWMX">iodide</a> I−, <a href="/facts/Nitrate/5AnVlYnL">nitrate</a> NO−3, and <a href="/facts/Selenate/drzesLxu">selenate</a> SeO2−4.
Green rust was first recognized as a <a href="/facts/Corrosion/lIC7H4we">corrosion</a> crust on iron and <a href="/facts/Steel/aN6qWo4H">steel</a> surfaces. It occurs in nature as the mineral <a href="/facts/Fougerite/LRSzzcRX">fougerite</a>.

Green rust open-in-new

Green rust