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|Type:||Artigo de periódico|
|Title:||Preparation of Cd/Al layered double hydroxides and their intercalation reactions with phosphonic acids|
|Abstract:||Layered double hydroxides(LDHs) containing cadmium as the divalent metal and aluminium as the trivalent metal have been prepared by coprecipitation from a mixed metal nitrate solution, and were obtained with nitrate and carbonate as the counter anions, and as single crystalline phases. XRD patterns show that these LDHs are isostructural with synthetic hydrotalcite, with interlayer spacings of 8.24 and 7.54 Angstrom for Cd/Al/NO3 and Cd/Al/CO3 LDHs, respectively. These compounds were intercalated with phenylphosphonic acid (PPA) and 2-carboxyethylphosphonic acid (CEPA). Intercalation is confirmed by XRD, where increased interlayer spacings were observed for the intercalation compounds. Interlayer distances of 14.59 Angstrom were observed for the PPA intercalation compounds, independent of the original counter anion. CEPA intercalated LDHs present interlayer spacings of 11.74 Angstrom for Cd/Al/CEPA obtained from Cd/Al/NO3 LDH and a double interlayer distance of 11.35 and 12.21 Angstrom for Cd/Al/CEPA obtained from Cd/Al/CO3 LDH. IR and NMR measurements suggest that this double interlayer spacing is due to the interaction of CEPA to the layers through both of its extremities, i.e. a phosphonate and a carboxylate interaction.|
|Editor:||Royal Soc Chemistry|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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