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A square planar [NiCl4]2− ion in the layered double hydroxide Al2Li(OH)6 [NiCl4]1/2

Published online by Cambridge University Press:  09 July 2018

K. Okada ,
F. Matsushita  and
S. Hayashi
K. Okada
Affiliation:
Department of lnorganic Materials, Tokyo Institute of Technology, Tokyo 152, Japan
F. Matsushita
Affiliation:
Department of lnorganic Materials, Tokyo Institute of Technology, Tokyo 152, Japan
S. Hayashi
Affiliation:
Department of lnorganic Materials, Tokyo Institute of Technology, Tokyo 152, Japan
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Abstract

The layered double hydroxide (LDH) Al2Li(OH)6[NiCl4]1/2 was synthesized by anion exchange of Al2Li(OH)6(NO3) and the coordination structure of [NiCl4]2− in the interlayers was investigated. The LDH had a hexagonal cell with a = 5.06 and c = 23.06 Å. Since the basal spacing of one layer was 7.7 Å, the interlayer distance was calculated to be 2.9 Å and was too narrow for the usual tetrahedral NiCl4 structure. From extended X-ray absorption fine structure (EXAFS) measurements, the first neighbour Ni-Cl distances in the LDH were 2.10 Å which was compatible with four-fold coordination. Since the electron spin resonance (ESR) spectrum of the LDH showed no absorption, the [NiCl4]2− structure was considered to be square planar, rather than the usual tetrahedral structure in the interlayers of LDH.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 2 , June 1997 , pp. 299 - 305
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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