New Layered Rare-Earth Hydroxides with Anion-Exchange Properties

Authors

  • Fengxia Geng,

    1. International Center for Materials Nanoarchitectonics and Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), Fax: (+81) 29-854-9061
    2. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571 (Japan)
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    • These authors contributed equally to the work.

  • Hao Xin Dr.,

    1. International Center for Materials Nanoarchitectonics and Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), Fax: (+81) 29-854-9061
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    • These authors contributed equally to the work.

  • Yoshitaka Matsushita Dr.,

    1. Beam Line Station, National Institute for Materials Science, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan)
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  • Renzhi Ma Dr.,

    1. International Center for Materials Nanoarchitectonics and Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), Fax: (+81) 29-854-9061
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  • Masahiko Tanaka Dr.,

    1. Beam Line Station, National Institute for Materials Science, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan)
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  • Fujio Izumi Dr.,

    1. Quantum Beamline Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
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  • Nobuo Iyi Dr.,

    1. International Center for Materials Nanoarchitectonics and Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), Fax: (+81) 29-854-9061
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  • Takayoshi Sasaki Prof.

    1. International Center for Materials Nanoarchitectonics and Nanoscale Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), Fax: (+81) 29-854-9061
    2. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571 (Japan)
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Abstract

We report the synthesis of a new series of layered hydroxides based on rare-earth elements with a composition of RE(OH)2.5Cl0.5⋅0.8 H2O (RE: Eu, Tb, etc.) through the homogeneous precipitation of RECl3x 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, SO42−, 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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