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Brucite-like structures can experience other modifications, by either isomorphic substitution of cations in the layers or substitution of part of the hydroxide groups by appropriate anions or water molecules.
LDH (palmitate) and LHS (salicylate) samples showed a band close to 1600 [cm.sup.-1], which can be associated with carbonyl stretching vibrations of acid as contaminant or due to H-bonding of free acid with carboxylate and/or pendant layer hydroxide groups [17].