In situ complexation of 8-hydroxyquinoline and 4,4'-bipyridine with zinc(II) in the interlayer space of montmorillonite

Patcharaporn Pimchan, Nithima Khaorapapong, Minoru Sohmiya, Makoto Ogawa

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    Abstract

    A series of mixed-ligand zinc complexes was prepared by coordination of 8-hydroxyquinoline and 4,4'-bipyridine to interlayer zinc(II) ion of montmorillonite through solid-solid reactions at room temperature. The intercalation of the ligands and the in situ formation of the mixed-ligand zinc complexes in the interlayer spaces of montmorillonite were confirmed by powder XRD, TG-DTA, as well as FT-IR, UV-Vis and photoluminescence spectroscopies. The intense photoluminescence of zinc(8-hydroxyquinoline)(4,4'-bipyridine)-montmorillonite hybrids appeared at 503nm while photoluminescence of zinc(4,4'-bipyridine)(8-hydroxyquinoline)-montmorillonite hybrids was seen at 511nm. The blue- and red-shifts of the luminescent bands of the hybrids compared with that of zinc(8-hydroxyquinoline)2-montmorillonite (506nm) suggested that the different types and/or microstructure of the mixed-ligand zinc complexes formed in the interlayer spaces of montmorillonite. The photoluminescence intensities of the as-prepared mixed-ligand zinc complexes in montmorillonite decreased in the order of zinc(8-hydroxyquinoline)(4,4'-bipyridine)2-montmorillonite>zinc(8-hydroxyquinoline)(4,4'-bipyridine)-montmorillonite>zinc(4,4'-bipyridine)(8-hydroxyquinoline)2-montmorillonite>zinc(4,4'-bipyridine)(8-hydroxyquinoline)-montmorillonite>zinc(8-hydroxyquinoline)-montmorillonite. The sequence of ligand loading affected the molecular structure and/or packing of the formed complex to control the photoluminescence efficiencies of the hybrids.

    Original languageEnglish
    Pages (from-to)310-316
    Number of pages7
    JournalApplied Clay Science
    Volume95
    DOIs
    Publication statusPublished - 2014

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    Keywords

    • 4,4'-Bipyridine
    • 8-Hydroxyquinoline
    • Montmorillonite
    • Solid-solid reaction

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geology

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