SYNTHESES AND THERMAL AND CHEMICAL BEHAVIORS OF TARTRATE AND SUCCINATE INTERCALATED ZN3AL AND ZN2CR LAYERED DOUBLE HYDROXIDES

Tartrate and succinate anions have been intercalated in Zn3Al and Zn2C r LDHs. The preparations using either coprecipitation, anion exchange, or reconstruction methods are described. In the case of tartrate-cont aining LDH, coprecipitation and reconstruction methods have proved to be very limited to lead to pure materials due to the particular reacti vity of tartrate anions. Intercalation of both anions under room-tempe rature conditions gives rise to expanded LDH with similar basal spacin g. Moderate thermal treatments lead in all cases to a reorientation of the anions in the interlayer domains associated with an interlayer co ntraction occurring around 80 degrees C. The structural characterizati on, the thermal evolution, and the chemical stability of all the phase s are studied by PXRD, FTIR, TGA, and DTA.