[Back]

M. Kronstein, J. Akbarzadeh, C. Drechsel, H. Peterlik, M.-A. Néouze:
"Photoluminescence properties in lonic Nanoparticle Networks";
Talk: 8. Workshop Anorganische Chemie in Österreich (WACÖ), Salzburg; 2014-04-14 - 2014-04-15; in: "8. Workshop Anorganische Chemie in Österreich", (2014), V-29.

lonic nanoparticle networks have shown versatile original features, making them promising hybrid materials for cutting edge applications such as catalysis, sensors or photoluminescence.
For the investigation of the promising luminescence properties of ionic nanoparticle networks (INN), various material compositions were analyzed. In this work the linker used to network the silica nanoparticles was varied; numerous substituted or non-substituted imidazolium and pyridinium linkers are presented. For the pyridinium based INN materials, a novel synthesis route; a one pot synthesis including a metal catalyst free hydrosilylation followed by a methanolysis reaction, for the precursor molecule was successfully applied. 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 effect of substituents introduced on the aromatic units also strongly influenced the luminescence properties of the material by modifying the π-π stacking between the imidazolium rings. Small angle X-ray scattering (SAXS) experiments clearly Support the role of the short-range order of the hybrid material in the luminescence phenomenon. Furthermore a clear relationship between the packing factor, calculated from the SAXS experiments, and the luminescence quantum yields could be evidenced. Additionally these INN materials could be used for the complexation of copper dichloride resulting in a green thermochromic material.

Project Head Marie-Alexandra Néouze:
Ionische Verknüpfung von Nanopartikeln