Preparation and properties of organic dispersions of monodisperse silica receptor colloids grafted with calixarene derivatives or alkyl chains

A.M. Nechifor, A.P. Philipse, F. de Jong, J.P.M. van Duynhoven, Richard J.M. Egberink, R.J.M. Egberink, D.N. Reinhoudt

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    Abstract

    We introduce cation-selective receptor colloids consisting of a monodisperse inorganic silica core grafted with an organic layer containing calixarene receptor molecules. The surface layer is designed to provide chemical selectivity (toward Cs+) as well as colloidal stability in organic solvents of interest in which silica spheres otherwise may flocculate. Grafting procedures for commercial- and laboratory-made silica dispersions are investigated for 25,27-bis[1-(11-hydroxyundecyl)oxy]calix[4]arene-crown-6 (designed and synthesized for this purpose), octadecyl alcohol, and mixtures ("cografting") of both compounds. Special attention is given to the nature of the solvent, which markedly influences grafting densities and colloidal stability during and after grafting procedures. NMR, elemental analysis, and light scattering are used to characterize a variety of carefully purified, grafted silica dispersions and to demonstrate, among other things, the presence of calixarene groups on the silica spheres. Preliminary complexation experiments with cesium chloride are reported. NMR and electrophoresis indicate that calixarene-silica colloids indeed are receptors for cesium cations.
    Original languageEnglish
    Pages (from-to)3844-3854
    JournalLangmuir
    Volume12
    Issue number16
    DOIs
    Publication statusPublished - 1996

    Fingerprint

    Calixarenes
    Colloids
    Dispersions
    Silicon Dioxide
    colloids
    Silica
    silicon dioxide
    Derivatives
    preparation
    Cesium
    cesium
    Cations
    Positive ions
    Nuclear magnetic resonance
    cations
    nuclear magnetic resonance
    electrophoresis
    Electrophoresis
    Complexation
    Light scattering

    Cite this

    Nechifor, A.M. ; Philipse, A.P. ; de Jong, F. ; van Duynhoven, J.P.M. ; Egberink, Richard J.M. ; Egberink, R.J.M. ; Reinhoudt, D.N. / Preparation and properties of organic dispersions of monodisperse silica receptor colloids grafted with calixarene derivatives or alkyl chains. In: Langmuir. 1996 ; Vol. 12, No. 16. pp. 3844-3854.
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    abstract = "We introduce cation-selective receptor colloids consisting of a monodisperse inorganic silica core grafted with an organic layer containing calixarene receptor molecules. The surface layer is designed to provide chemical selectivity (toward Cs+) as well as colloidal stability in organic solvents of interest in which silica spheres otherwise may flocculate. Grafting procedures for commercial- and laboratory-made silica dispersions are investigated for 25,27-bis[1-(11-hydroxyundecyl)oxy]calix[4]arene-crown-6 (designed and synthesized for this purpose), octadecyl alcohol, and mixtures ({"}cografting{"}) of both compounds. Special attention is given to the nature of the solvent, which markedly influences grafting densities and colloidal stability during and after grafting procedures. NMR, elemental analysis, and light scattering are used to characterize a variety of carefully purified, grafted silica dispersions and to demonstrate, among other things, the presence of calixarene groups on the silica spheres. Preliminary complexation experiments with cesium chloride are reported. NMR and electrophoresis indicate that calixarene-silica colloids indeed are receptors for cesium cations.",
    author = "A.M. Nechifor and A.P. Philipse and {de Jong}, F. and {van Duynhoven}, J.P.M. and Egberink, {Richard J.M.} and R.J.M. Egberink and D.N. Reinhoudt",
    year = "1996",
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    Preparation and properties of organic dispersions of monodisperse silica receptor colloids grafted with calixarene derivatives or alkyl chains. / Nechifor, A.M.; Philipse, A.P.; de Jong, F.; van Duynhoven, J.P.M.; Egberink, Richard J.M.; Egberink, R.J.M.; Reinhoudt, D.N.

    In: Langmuir, Vol. 12, No. 16, 1996, p. 3844-3854.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Preparation and properties of organic dispersions of monodisperse silica receptor colloids grafted with calixarene derivatives or alkyl chains

    AU - Nechifor, A.M.

    AU - Philipse, A.P.

    AU - de Jong, F.

    AU - van Duynhoven, J.P.M.

    AU - Egberink, Richard J.M.

    AU - Egberink, R.J.M.

    AU - Reinhoudt, D.N.

    PY - 1996

    Y1 - 1996

    N2 - We introduce cation-selective receptor colloids consisting of a monodisperse inorganic silica core grafted with an organic layer containing calixarene receptor molecules. The surface layer is designed to provide chemical selectivity (toward Cs+) as well as colloidal stability in organic solvents of interest in which silica spheres otherwise may flocculate. Grafting procedures for commercial- and laboratory-made silica dispersions are investigated for 25,27-bis[1-(11-hydroxyundecyl)oxy]calix[4]arene-crown-6 (designed and synthesized for this purpose), octadecyl alcohol, and mixtures ("cografting") of both compounds. Special attention is given to the nature of the solvent, which markedly influences grafting densities and colloidal stability during and after grafting procedures. NMR, elemental analysis, and light scattering are used to characterize a variety of carefully purified, grafted silica dispersions and to demonstrate, among other things, the presence of calixarene groups on the silica spheres. Preliminary complexation experiments with cesium chloride are reported. NMR and electrophoresis indicate that calixarene-silica colloids indeed are receptors for cesium cations.

    AB - We introduce cation-selective receptor colloids consisting of a monodisperse inorganic silica core grafted with an organic layer containing calixarene receptor molecules. The surface layer is designed to provide chemical selectivity (toward Cs+) as well as colloidal stability in organic solvents of interest in which silica spheres otherwise may flocculate. Grafting procedures for commercial- and laboratory-made silica dispersions are investigated for 25,27-bis[1-(11-hydroxyundecyl)oxy]calix[4]arene-crown-6 (designed and synthesized for this purpose), octadecyl alcohol, and mixtures ("cografting") of both compounds. Special attention is given to the nature of the solvent, which markedly influences grafting densities and colloidal stability during and after grafting procedures. NMR, elemental analysis, and light scattering are used to characterize a variety of carefully purified, grafted silica dispersions and to demonstrate, among other things, the presence of calixarene groups on the silica spheres. Preliminary complexation experiments with cesium chloride are reported. NMR and electrophoresis indicate that calixarene-silica colloids indeed are receptors for cesium cations.

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