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8 (1996) 952, © 1996, with permission from the American Chemical Society. These interesting results evidence that the LDH interlayer domains can act as nanoreactors for the polymerization of inorganic oxo-anions. Formation of tetrahedral silicate sheets via the polymerization of SiO4 polyhedra results in new interstratified phases, never prepared so far, which easily undergo layer to layer condensation reactions, resulting in clay-mineral-structure-like compounds. This appears as a promising synthetic approach to prepare, via a "chimie douce" route, new synthetic clays with tuneable metallic cations composition.

The similar d values obtained for the Cr2O7 and XO4 LDH phases must account for a similar orientation of the anions, Cr2O7 lying flat and parallel to the layers. This can ensure optimal interactions of all polyhedra oxygen atoms with the OH groups. The analysis of the structural data enable two different modes of anion-layer interactions to be differentiated: 24 A. de Roy, C. P. 922H. In all these phases, the oxo-anions are oriented in a similar way to the SO42- ions in the reference material. Among this group, [Zn-Cr-SO4] and [Zn-Al-SO4] appear to be structurally stable under usual storing conditions.

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