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New layered rare-earth hydroxides with anion-exchange properties.

Authors
Type
Published Article
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
Publication Date
Volume
14
Issue
30
Pages
9255–9260
Identifiers
DOI: 10.1002/chem.200800127
PMID: 18752245
Source
Medline
License
Unknown

Abstract

We report the synthesis of a new series of layered hydroxides based on rare-earth elements with a composition of RE(OH)2.5Cl(0.5).0.8 H2O (RE: Eu, Tb, etc.) through the homogeneous precipitation of RECl3.x H2O with hexamethylenetetramine (HMT). Rietveld analysis combined with direct methods revealed an orthorhombic layered structure comprising a positively charged layer of [RE(OH)2.5-(H2O)0.8]0.5+ and interlayer Cl- ions. The Cl- ions were readily exchangeable for various anions (NO3-, SO4(2-), dodecylsulfonate, etc.) at ambient temperature. Photoluminescence studies showed that the compounds display typical RE3+ emission. With rare-earth-based host layers and tunable interlayer guests, the new compounds may be of interest for optoelectronic, magnetic, catalytic, and biomedical materials.

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