New (Ni, Co)-based layered double hydroxides with intercalated oxometalate (Mo, W) species, obtained by chimie douce reactionsElectronic supplementary information (ESI) available: parameters obtained after refinement of the EXAFS data at the Ni and Mo K-edges for LDH0.30(Mo) (Table S1) and parameters obtained after refinement of the EXAFS data at the W L(III)-edge for LDH0.30(W) (Table S2). See http://www.rsc.org/suppdata/jm/b1/b107791k/
Vaysse, Christophe; Guerlou-Demourgues, Liliane; Demourgues, Alain; Lazartigues, Florian; Fertier, David; Delmas, Claude; Vaysse Christophe; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux; Guerlou-Demourgues Liliane; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux; Demourgues Alain; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux; Lazartigues Florian; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux; Fertier David; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux; Delmas Claude; Institut de Chimie de la Matière Condensée de Bordeaux-CNRS and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux
Журнал:
Journal of Materials Chemistry
Дата:
2002
Аннотация:
Layered double hydroxides (LDHs), containing intercalated oxometalate (Mo, W) species, were obtained by chimie douce reactions from NaNi1 â yCoyO2 cobalt substituted sodium nickelates (0.10 â ¤ y â ¤ 0.40). The X-ray diffraction (XRD), infrared (IR) and extended X-ray absorption fine structure (EXAFS) studies show that, in both cases, M2O7<sup>2â </sup> anions (M.dbd;Mo, W), made of corner-sharing tetrahedra, are intercalated. In these MO4 tetrahedra, the Mâ O bond with the bridging oxygen is elongated compared to the other ones, and the Mâ Oâ M angle is close to 115°. Oxygen atoms belonging to water molecules are pointing to some faces of the MO4 tetrahedra. The presence of such peculiar intercalated species, as well as the existence of an hydrogen bond network, leads to local distortions within the slabs, which entails a â turbotratic typeâ shape of the XRD patterns.
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