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M.-A. Néouze:
"Building and Tailoring of Nanoparticle Networks based on Imidazolium Bridges";
Vortrag: XXIVth European Colloquium on Heterocyclic Chemistry, Vienna; 23.08.2010 - 27.08.2010; in: "XXIVth European Colloquium on Heterocyclic Chemistry", (2010), ISBN: 978-3-9502992-0-5; S. OP-11.

We recently developed an original method to synthesize 3-D networks consisting of metal oxide nanoparticles, through the introduction of functionalized ionic linkers, containing one or more imidazolium functional groups. Recent publications pointed out the powerful synergy of ionic species with nanoparticles. Such synergy made those new inorganic-organic hybrid materials promising candidates for many applications such as, among others, catalysis or electrolytes.
The length and rigidity of the imidazolium bridging unit was varied. The short-range ordering of the network was investigated via Small-Angle X-ray Scattering.
Anion metathesis reaction was performed on ionic silica networks based on imidazolium chloride bridging units. The investigated salts were NaBF₄, KPF₆ and LiN(SO₂CF₃)₂. X-ray diffraction experiments and Nuclear Magnetic Resonance analysis allowed following the anion metathesis. For all compounds the thermal stability of the hybrid material is maintained after the metathesis. Small-Angle X-ray Scattering experiments confirmed that the anion metathesis did only very slightly affect the short-range order of the network. The yield of the metathesis reaction was evaluated by Energy Dispersive X-ray spectroscopy.
The anion metathesis reaction on the imidazolium counter-ion provides a tailoring tool for the hybrid material hydrophilicity.

Projektleitung Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln