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Talks and Poster Presentations (with Proceedings-Entry):

M.-A. Néouze, M. Litschauer, F. Tielens, C. Gervais, C. Coelho, C. Bonhomme:
"Combining Theory and NMR Experiments to Characterize Imidazolium Nanoparticle Networks";
Poster: MRS Spring Meeting 2012, San Francisco; 2012-04-09 - 2012-04-13; in: "MRS Spring Meeting 2012 - Program & Exhibit Guide", (2012), BBB5.14.



English abstract:
Recently, Ionic Nanoparticle Networks (INN) were reported, based on imidazolium bridged nanoparticles. These new hybrid materials revealed original features, such as luminescent properties or porosity, depending strongly on the nanoparticles grafting density.
For gas sequestration or gas separation applications, but even more for photoluminescence applications, the structure of the hybrid material has to be investigated. The position of the chlorine anions, compensating the imidazolium bridging units is a very promising information to investigate the accessibility of the imidazolium functionalities. We report in this work the structural characterization of silica INN focusing on the chlorine atoms. Experimental solid state NMR results were combined with periodic DFT structural models and the corresponding calculated NMR parameters. An "exotic" nucleus like 35Cl (which suffers from a rather low sensitivity) is very interesting in such systems and requires the use of very high field NMR spectrometers. Moreover, 1H/X/Y correlations experiments can be quite informative for such hybrid materials, in particular when 1H spectra are well resolved thanks to the use of an ultra fast MAS probe (70 kHz).

Created from the Publication Database of the Vienna University of Technology.