Hybrid derivatives of layered double hydroxides

The intercalation of a series of organic anions into ZnAl- and CuCr- hydrotalcite-like compounds and Cu 2(OH) 3(CH 3COO)·H 2O has been performed. The organic anions differ by the anionic function (carboxylate, sulfonate and phosphonate) or by the substituted groups on the aromatic ring (OH, Cl, NH 2, NO 2). The various hybrid phases were thermally treated in order to graft the anions onto the hydroxylated layers of the host structure. The CuCr- Layered Double Hydroxide (LDH) displays a reactivity higher than the ZnAl- compound with regard to the sulfonate and phosphonate groups. The grafting of aromatic carboxylates with OH groups substituted in para or meta positions is also evidenced. The characterization of all the compounds were realized using X-ray powder diffraction, infrared spectroscopy and thermogravimetry analyses.