کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1694823 | 1519082 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: In situ complexation of 8-hydroxyquinoline and 4,4′-bipyridine with zinc(II) in the interlayer space of montmorillonite In situ complexation of 8-hydroxyquinoline and 4,4′-bipyridine with zinc(II) in the interlayer space of montmorillonite](/preview/png/1694823.png)
• Coordination polymers of mixed-ligand zinc complexes were prepared in clay minerals
• Sequence of loading ligands, molar ratios affected the nanostructure and/or packing
• The hybrids might be possibly used as an emitting material in optoelectronic devices
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 503 nm while photoluminescence of zinc(4,4′-bipyridine)(8-hydroxyquinoline)-montmorillonite hybrids was seen at 511 nm. The blue- and red-shifts of the luminescent bands of the hybrids compared with that of zinc(8-hydroxyquinoline)2-montmorillonite (506 nm) 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.
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Journal: Applied Clay Science - Volume 95, June 2014, Pages 310–316