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Issue 3, 1993
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Layered basic copper anion exchangers: chemical characterisation and X-ray absorption study

Abstract

The local structure around copper in Cu2(OH)3OAc·H2O, and in the anhydrous iodide analogue prepared by ion exchange, has been determined by X-ray absorption spectroscopy at 77 K. For both compounds, the copper environment is compatible with a botallackite-type Cu2(OH)3Br arrangement, in which two crystallographically distinct copper atoms lie in 4 + 2 (oxygen + X) and 4 + 1 + 1 (oxygen + oxygen + X) environments (X = exchangeable anion OAc, I, Br etc.). Interatomic distances between copper and the exchangeable anion have been determined to be 2.78 and 3.15 Å in Cu2(OH)3OAc·H2O and Cu2(OH)3I, respectively, the latter representing an unusual example of a direct CuII—I bond. At least two Cu—Cu distances could be identified in the radial distribution function: r(Cu[dash dash, graph caption]Cu)= 3.16 and 6.32 Å, signals from second and more distant neighbours being reinforced by a focussing effect along the linear chain of copper atoms in the layers.

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J. Mater. Chem., 1993,3, 303-307
Article type
Paper

Layered basic copper anion exchangers: chemical characterisation and X-ray absorption study

A. Jiménez-López, E. Rodríguez-Castellón, P. Olivera-Pastor, P. Maireles-Torres, A. A. G. Tomlinson, D. J. Jones and J. Rozière, J. Mater. Chem., 1993, 3, 303
DOI: 10.1039/JM9930300303

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