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 f...
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| Veröffentlicht in: | Chemistry of materials 1999, Vol.11 (2), p.303-307 |
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| creator | Boclair, Joseph W Braterman, Paul S Jiang, Jianping Lou, Shaowei Yarberry, Faith |
| description | 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 ≈ 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. |
| doi_str_mv | 10.1021/cm980524m |
| format | Article |
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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. 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Formation of Cr(III)-Containing Layered Double Hydroxides Directly from Solution</title><title>Chemistry of materials</title><addtitle>Chem. Mater</addtitle><description>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 ≈ 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. 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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.</abstract><cop>Legacy CDMS</cop><pub>American Chemical Society</pub><pmid>11542281</pmid><doi>10.1021/cm980524m</doi><tpages>5</tpages></addata></record> |
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| source | MEDLINE; NASA Technical Reports Server; American Chemical Society Journals |
| subjects | Anions - chemistry Cations - chemistry Chemistry Chlorides - chemistry Chromium - chemistry Chromium Compounds - chemistry Cobalt - chemistry Exact sciences and technology Exobiology General and physical chemistry Hydrogen-Ion Concentration Hydroxides - chemistry Magnesium - chemistry Manganese - chemistry Metals - chemistry Nickel - chemistry Solubility Solution properties Solutions Space life sciences Sulfates - chemistry Titrimetry Zinc - chemistry |
| title | Layered Double Hydroxide Stability. 2. Formation of Cr(III)-Containing Layered Double Hydroxides Directly from Solution |
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