Syntheses and Thermal and Chemical Behaviors of Tartrate and Succinate Intercalated Zn₃Al and Zn₂Cr Layered Double Hydroxides

Abstract

Tartrate and succinate anions have been intercalated in Zn(3)Al and Zn(2)Cr LDHs. The preparations using either coprecipitation, anion exchange, or reconstruction methods are described. In the case of tartrate-containing LDH, coprecipitation and reconstruction methods have proved to be very limited to lead to pure materials due to the particular reactivity of tartrate anions. Intercalation of both anions under room-temperature conditions gives rise to expanded LDH with similar basal spacing. Moderate thermal treatments lead in all cases to a reorientation of the anions in the interlayer domains associated with an interlayer contraction occurring around 80 degrees C. The structural characterization, the thermal evolution, and the chemical stability of all the phases are studied by PXRD, FTIR, TGA, and DTA.

Synthesis and Properties of Zn−Al Layered Double Hydroxides Containing Ferrocenecarboxylate Anions

“…Many organic-anion-pillared LDHs exhibit similar structural features. [10] The turbostratic effect is caused by a decrease in the ordering along the stacking axis due to the loss of van der Waals interactions between adjacent layers and the absence of a densely packed interlayer space formed by high charge density anions such as carbonate. On comparing the powder XRD patterns shown in Figure 1, it is evident that Zn 2 AlϪFcCOO exhibits increased turbostratic disorder because the hkl reflections are broader and less intense, and in fact several are not observed.…”

Factors Affecting the Interlayer Arrangement of Transition Metal–Ethylenediaminetetraacetate Complexes Intercalated in Mg/Al Layered Double Hydroxides

“…Whilst a grafting phenomenon at low temperature has been reported for LDHs with both oxygen-containing and non-oxygen-containing anions, [19][20][21][22][23][24] other authors have suggested that the thermally metastable phase originates from a reorientation of the anions in the interlayer domains rather than from such a grafting process. [25][26][27][28][29][30] In this work, we report the intercalation of transition metal complexes [ (where Y denotes edta 4-) into MgAl LDHs with different Mg/Al ratios, by a hydrothermal synthesis method. Our aim is to clarify the factors affecting the orientation of the complexes, particularly in the temperature interval 30-400°C, in order to understand the evolution of the interlayer phase with temperature.…”

ZnCr Layered Double Hydroxide (LDH) Nanosheets Assisted Formation of Hierarchical Flower‐Like CdZnS@LDH Microstructures with Improved Visible‐Light‐Driven H2 Production

“…ZnCr-LDH was prepared by using the coprecipitation method, which was similar to that reported by Corinne Depge et al [41] Typically, 40 mL aqueous solution containing Zn(NO 3 ) 2 ·6 H 2 O (7.85 g) and Cr(NO 3 ) 3 ·9 H 2 O (4.57 g), and another aqueous solution containing NaOH (8.0 g/100 mL H 2 O) were simultaneously added to 150 mL DI water, and the pH of the slurry was maintained at approximately 5.5 AE 0.5 under continuous stirring. The resulting slurry was continuously stirring for 12 h at room temperature and then aged 24 h at 80 8C.…”