Cu-Ni-Mg-Al-CO_3 hydrotalcite-like materials have been synthesized at high supersaturation using a new method developed in our laboratory by combining a mixed solution of Cu(NO_3)_2·6H_2O, Mg(NO_3)_2·6H_2O and Al(NO_3)_3·9H_2O with a second solution containing NaOH and Na_2CO_3. The materials obtained have been characterized by XRD, FT-IR, TG-DTA and ICP. The influence of different molar ratios of divalent metal ions on the crystal structure, selectivity of crystal growth in different directions and host-guest interactions in the Cu-Ni-Mg-Al- CO_3 hydrotalcite-like materials has been investigated. It is shown that Cu-Ni-Mg-Al-CO_3 hydrotalcite-like nanomaterials can be obtained using this method, and the influence of the Jahn-Teller effect on the crystal structure, thermal stability and host-guest interactions because of the presence of Cu~(2+) is quite marked. Furthermore, with increasing amounts of Mg~(2+), the thermal stabilities of Cu-Ni-Mg-Al- CO_3 hydrotalcite-like materials become better.

Key words: MAGNESIUM, ALUMINIUM, QUATERNARY, HYDROTALCITE, COPPER, NICKEL, SYNTHESIS, STRUCTURAL ANALYSIS, ICP-ATOMIC EMISSION SPECTROMETRY, X-RAY DIFFRACTION