Mg-Al layered double hydroxides (Mg-Al LDHs) intercalated with benzenesulfonate (BS-) and benzenedisulfonate (BDS2-) ions were prepared by coprecipitation and characterized by X-ray diffraction, FT-IR spectroscopy, and chemical analyses. The intercalated BS- and BDS2- maintained their intrinsic molecular structures within the Mg-Al LDH interlayers. At low intercalation levels, the benzene ring of BS- in BS · Mg-Al LDH was inclined at 30° relative to the plane of the brucite-like layers of Mg-Al LDH. With increasing BS- content, the benzene ring adopted an additional configuration perpendicular to the Mg-Al LDH layers. In BDS-intercalated Mg-Al LDH, the benzene ring of BDS2- was tilted at 26° relative to the plane of the Mg-Al LDH layers. Intercalation levels of BDS2- were smaller than those of BS- despite the greater charge density of BDS2-, which was likely attributable to a greater degree of electrostatic repulsion between intercalated anions.
- Magnesium-aluminum layered double hydroxide