Synthesis and structural features of a novel Ba(II)-Fe(III)-layered double hydroxide

Strankó, Dávid Ferenc and Pallagi, Attila and Pálinkó, István and Sipos, Pál Miklós (2009) Synthesis and structural features of a novel Ba(II)-Fe(III)-layered double hydroxide. In: Insights into Coordination, Bioinorganic and Applied Inorganic Chemistry. Slovak University of Technology, Bratislava, pp. 380-385. ISBN 978-80-227-3085-3

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Abstract

Double hydroxides containing Ba(II) and Fe(III) have been prepared by the co-precipitation of a solution containing Ba(ClO4)2 and Fe(ClO4)3 in an extremely concentrated (up to 20 M) aqueous NaOH solution. The white to pale yellow compounds formed at [NaOH]T ≥ 10 M proved to have layered structure by powder XRD. To the best of our knowledge, this is the first report of layered double hydroxide (LDH) preparation from such highly concentrated base solutions. The interlayer distances of our Ba-Fe-LDHs proved to vary with the base concentration and aging. Ba-Fe-hydroxo-complex salts obtained by others under identical experimental conditions were 3– 4– claimed to consist of [Fe(OH)6] structural units at [NaOH]T = 10 M and [Fe(OH)7] ones at [NaOH]T = 20 M. EXAFS and XANES data indicated that the local environment of Fe(III) is 57 independent of [NaOH]T. From Fe Mössbauer spectroscopy, the local structure of Fe(III) in our Ba-Fe-LDHs is identical to that obtained for Na3Fe(OH)6.xNaOH, i.e., the Fe(III) is in octahedral environment, which is typical for the cationic components incorporated in the LDH structure.

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