Distinguishing Anionic Species That Are Intercalated in Layered Double Hydroxides from Those Bound to Their Surface: A Comparative IR Study

Guest molecules in layered double hydroxides (LDHs) may be located both on the surface and interlayer gallery. In this work, a comparative study of various IR spectroscopic methods coupled with X-ray diffraction (XRD) is presented, which makes it possible to distinguish between two possibilities. During experimental first, CaAl-LDHs intercalated nitrate/carbonate ions were transformed d-gluconate- benzoate-containing solids. Depending initial ion, organic end up layers and/or LDH. The spectra specimens recorded by using four different techniques, are their penetration depth (photoacoustic spectroscopy (PAS), attenuated total reflectance (ATR), diffuse (DRIFTS), wide angle (WA-DRIFTS)). By comparing obtained, anionic species that adsorbed LDHs proven distinguishable from those PAS shown provide information about interlamellar bulk compounds. screening could performed WA-DRIFTS technique, while ATR DRIFTS capable detecting anions residing top few layers.