PREFERENTIAL INTERCALATION OF ORGANIC-ANIONS INTO LAYERED DOUBLE HYDROXIDE

Intercalation compounds of organic anions into layered double hydroxid es (LDH) are synthesized by the coprecipitation route. X-ray diffracti on data reveal that the intercalated terephthalate (TP), naphthalene-2 ,6-disulfonate (NA26), and anthraquinone-2,6-disulfonate (AQ26) are ar ranged. with their molecular planes perpendicular to the hydroxide lay er. HPLC data show that 26.2% of TP and 73.8% of AQ26 are co-intercala ted, whereas NA26 is not intercalated into the Zn/Al-LDH. These result s indicate the possibility of a molecular recognition ability of Zn/Al -LDH. The molecular recognition ability of intercalation into Zn/Al-LD H is in the order AQ26 > TP >> NA26.