Anion metathesis in ionic silicananoparticle networks

Litschauer, Marco; Puchberger, Michael; Peterlik, Herwig; Néouze, Marie-Alexandra

doi:10.1039/b915050a

Cited by 25 publications

(32 citation statements)

References 55 publications

(135 reference statements)

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“…(21); the anion exchange reaction on Im/Cl to obtain Im/PF 6 , Im/BF 4 , or Im/N(SO 2 CF 3 ) 2 ;(34) the reaction of N -(3-propyltrimethoxysilane)imidazole modified silica nanoparticles with 1,6-dichlorohexane which led to the product Im/Cl/Hex/Im/Cl . (33)…”

Section: Methodsmentioning

confidence: 99%

Photoluminescence as Complementary Evidence for Short-Range Order in Ionic Silica Nanoparticle Networks

et al. 2010

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Recently we published the synthesis of new hybrid materials, ionic silica nanoparticles networks (ISNN), made of silica nanoparticles covalently connected by organic bridging ligands containing imidazolium units owing to a “click-chemistry-like” reaction. Among other techniques small-angle X-ray scattering (SAXS) experiments were carried out to get a better picture of the network extension. It turned out that the short-range order in ISNN materials was strongly influenced by the rigidity of the bridging ligand, while the position of the short-range order peaks confirmed the successful linking of the bridging ligands. The photoluminescence experiments reported in this communication revealed strongly enhanced emission in the hybrid material in comparison with neat imidazolium salts. Moreover the shift of the emission maximum toward longer wavelengths, obtained when varying the aromatic ring content of the bridging ligand, suggested the existence of strong π−π stacking in the hybrid material. Experiments revealed a stronger luminescence in those samples exhibiting the higher extent of short-range order in SAXS.

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Section: Methodsmentioning

confidence: 99%

Photoluminescence as Complementary Evidence for Short-Range Order in Ionic Silica Nanoparticle Networks

et al. 2010

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“…The successful synthesis of the INN materials was verified by a combination of two characterization methods: first, through thermogravimetric analysis (TGA), the prepared material shows a higher thermal stability than those of the precursors. [9] Second, under excitation at l = 280 nm, the material is characterized by an emission at l = 320 nm, whereas the precursors are not luminescent. [10]…”

Section: Synthesis Of Silica Nanoparticle Network With Chloride Anionsmentioning

confidence: 99%

“…The success of the anion-exchange reaction was verified by the presence of formed sodium chloride or potassium chloride in the solution after filtering off the exchanged material, as determined by XRD. [9] Characterizations TGA coupled with mass spectroscopy (TG-MS)…”

Section: Synthesis Of the Silica Nanoparticle Network With Tetrafluomentioning

confidence: 99%

Exploring the Molecular Structure of Imidazolium–Silica‐Based Nanoparticle Networks by Combining Solid‐State NMR Spectroscopy and First‐Principles Calculations

Néouze

Kronstein

Litschauer

et al. 2014

Chemistry A European J

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A DFT-based molecular model for imidazolium-silica-based nanoparticle networks (INNs) is presented. The INNs were synthesized and characterized by using small-angle X-ray scattering (SAXS), NMR spectroscopy, and theoretical ab initio calculations. (11)B and (31)P HETCOR CP MAS experiments were recorded. Calculated (19)F NMR spectroscopy results, combined with the calculated anion-imidazolium (IM) distances, predicted the IM chain density in the INN, which was also confirmed from thermogravimetric analysis/mass spectrometry results. The presence of water molecules trapped between the nanoparticles is also suggested. First considerations on possible π-π stacking between the IM rings are presented. The predicted electronic properties confirm the photoluminescence emissions in the correct spectral domain.

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“…[9,6] Recently we published the synthesis of new hybrid materials, ionic nanoparticle networks, which will be hereafter referred to as INN (Scheme 1). [10] The INN materials showed attractive properties, such as catalytic activity, [11] anion exchange ability [12] or thermochromic behavior by complexation of copper dichloride. [13] Moreover, the INN materials showed interesting photoluminescence properties.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Photoluminescence Properties in Ionic Nanoparticle Networks

Kronstein

Akbarzadeh²,

Drechsel

et al. 2014

Chemistry A European J

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To investigate the original and promising luminescence properties of ionic nanoparticle networks (INN), various material compositions were investigated. In this work, the linker used to network the silica nanoparticles was varied; numerous substituted or non-substituted imidazolium, pyrazolium and pyridinium linkers are presented. Photoluminescence experiments on the INN hybrid materials revealed strong emission bands over a broad range in the visible region of the light spectrum. Varying the aromatic linker between the imidazolium units induced clear shifts of the emission maxima up to 100 nm, as a consequence of π-π stacking interactions. Steric hindrance and inductive effects of the substituents, introduced on the aromatic units, also strongly influenced the luminescence properties of the materials by modifying the π-π stacking between the imidazolium rings. Small and wide-angle X-ray scattering (SAXS, WAXS) experiments revealed a clear trend between the obtained structural parameters (short-range order parameter and distance of the aromatic units within the hybrid material) and the luminescence quantum yields of the INN materials.

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Anion metathesis in ionic silicananoparticle networks

Cited by 25 publications

References 55 publications

Photoluminescence as Complementary Evidence for Short-Range Order in Ionic Silica Nanoparticle Networks

Photoluminescence as Complementary Evidence for Short-Range Order in Ionic Silica Nanoparticle Networks

Exploring the Molecular Structure of Imidazolium–Silica‐Based Nanoparticle Networks by Combining Solid‐State NMR Spectroscopy and First‐Principles Calculations

Tailoring Photoluminescence Properties in Ionic Nanoparticle Networks

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