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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Layered double hydroxide stability. 2. Formation of Cr(III)-containing layered double hydroxides directly from solution.

Solutions containing divalent metal [M(II) = Mg2+, Zn2+, Co2+, Ni2+, Mn2+] chlorides and CrCl3 6H2O were titrated with NaOH to yield, for M(II) = Zn, Co, and Ni, hydrotalcite-like layered double hydroxides (LDHs), [[M(II)]1-z[Cr(III)]z(OH)2][Cl]z yH2O, in a single step, without intermediate formation of chromium hydroxide. Analysis of the resultant titration curves yields solubility constants for these compounds. These are in the order Zn < Ni approximately Co, with a clear preference for formation of the phase with z = 1/3. With Mg2+ as chloride, titration gives a mixture of Cr(OH)3 and Mg(OH)2, but the metal sulfates give Mg2Cr(OH)6 1/2(SO4) by a two-step process. Titrimetric and spectroscopic evidence suggests short-range cation order in the one-step LDH systems.[1]

References

  1. Layered double hydroxide stability. 2. Formation of Cr(III)-containing layered double hydroxides directly from solution. Boclair, J.W., Braterman, P.S., Jiang, J., Lou, S., Yarberry, F. Chemistry of materials : a publication of the American Chemical Society. (1999) [Pubmed]
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