Abstract
Layered double hydroxides of aluminum and zinc (Zn/Al-LDH’s) were synthesized directly by hydrolysis at room temperature as reported elsewhere. After characterization, the material was reacted with m-aminobenzoat anion (m-NH2C6H4COO-) which undergoes polymerization in the interlayer space; resulting in the formation of a matrix with polymeric organic macromolecule. The resulting material along with the host LDH’s compound of Zn/Al-Cl was characterized by X-Ray Powder Diffraction (PXRD), Thermal Analysis (TG), Differential Thermal Analysis (DTA), and Fourier Transform Infrared Spectroscopy (FTIR). The study confirms the intercalation of m-aminobenzoat anion. Diffusion of oxygen molecules between the contact region of two anions in the interlayer space and oxidation of the anion lead to the formation of a polymer macromolecule. This intercalation compound result in a gallery height of 15.8 A, indicating that the guest anion stack to form a monolayer with the benzene rings perpendicular to the host layers, giving a suitable orientation for polymerization.
Highlights
At variable oxidation states[10,11,12]
Less hydroxyl groups are found when compared by LDH layers that are decorated with hydroxyl groups at both layer surfaces[13,14]
Many chemical modifications using the host - guest system for incorporating molecules in the interlayer space were found in the literature, for instant, different anionic dyes were incorporated into Zn/AlLDH[15], tetraphthalate, naphthalene-2,6-disulfonate, and anthraquinone-2,6-disulfonate anions were incorporated with the same type LDH[16], and different dicarboxylate anions with Zn/Al-LDH were synthesized[17]
Summary
At variable oxidation states[10,11,12]. The layer surfaces of LDH’s are structurally similar to Kaolinite (Al2Si2O5), Layered double hydroxides LDH’s or anionic clays have been of interest to researchers of different discipline in chemistry due to their many applications specially as adsorbents, ion-exchangers, catalyst precursors and more recently in pharmaceutics for drug release control[1,2,3,4,5,6,7]. LDH are minerals and synthetic materials that consist of layered structure with positive charge brucite-type (Mg(OH)2) layers of mixed metal hydroxides. Exchangeable anions are located in the inter layer spaces to balance the positive charge of the layers. It is possible to exchange in which it is a dioctahedral layered alminosilicate, consists of aluminum atoms coordinated octahedcally with oxygen atoms and hydroxyl groups on the outer surface of the layer. Less hydroxyl groups are found when compared by LDH layers that are decorated with hydroxyl groups at both layer surfaces[13,14] This fact makes the LDH to be susceptible to the same type of reactions with Kaolinite and probably with higher reactivity, due to the availability of reaction sites. The amount of (13.6 g) 0.1 mole of an aqueous solution of
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