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Issue 22, 2011
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New insights into the intercalation chemistry of Al(OH)3

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This paper reports a number of recent developments in the intercalation chemistry of Al(OH)3. From Rietveld refinement and solid-state NMR, it has been possible to develop a structural model for the recently reported [MIIAl4(OH)12](NO3)2·yH2O family of layered double hydroxides (LDHs). The M2+ cations occupy half of the octahedral holes in the Al(OH)3 layers, and it is thought that there is complete ordering of the metal ions while the interlayer nitrate anions are highly disordered. Filling the remainder of the octahedral holes in the layers proved impossible. While the intercalation of Li salts into Al(OH)3 is facile, it was found that the intercalation of MII salts is much more capricious. Only with Co, Ni, Cu, and Zn nitrates and Zn sulfate were phase-pure LDHs produced. In other cases, there is either no reaction or a phase believed to be an LDH forms concomitantly with impurity phases. Reacting Al(OH)3 with mixtures of MII salts can lead to the production of three-metal MII–MII′–Al LDHs, but it is necessary to control precisely the starting ratios of the two MII salts in the reaction gel because Al(OH)3 displays selective intercalation of M nitrate (Li > Ni > Co ≈ Zn). The three-metal MII–MII′–Al LDHs exhibit facile ion exchange intercalation, which has been investigated in the first energy dispersive X-ray diffraction study of a chemical reaction system performed on Beamline I12 of the Diamond Light Source.

Graphical abstract: New insights into the intercalation chemistry of Al(OH)3

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The article was received on 17 Dec 2010, accepted on 31 Mar 2011 and first published on 09 May 2011

Article type: Paper
DOI: 10.1039/C0DT01790F
Citation: Dalton Trans., 2011,40, 6012-6022
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    New insights into the intercalation chemistry of Al(OH)3

    G. R. Williams, S. J. Moorhouse, T. J. Prior, A. M. Fogg, N. H. Rees and D. O'Hare, Dalton Trans., 2011, 40, 6012
    DOI: 10.1039/C0DT01790F

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