Preparation and Characterization of Intercalation Compounds of Layered Double Hydroxides with Metallic Oxalato Complexes

Intercalation of metallic oxalato complexes CoOx22-, CuOx22-, MnOx33-, and GaOx33- in [Zn2Al] and [Mg2Al] LDHs was successfully carried out leading to well characterized products in which metallic complexes lying between layers were subjected to minor modifications following intercalation as confirmed by XRD, FTIR, and particularly XAFS studies. The obtained data permitted modeling the layout of metallic oxalato complexes between the layers for each compound. Thermal treatments undertaken on exchanged compounds led to a mixing of oxides with increase in surface areas particularly for the Ga-containing product. Dispersed oxide and metallic particules were obtained by a soft chemistry treatment in refluxing ethylene glycol