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M. Gollowitzer, D. Müller, P. Weinberger:
"Synthetic Approaches to Novel Crystalline Sponges";
Poster: 32. Workshop Novel Materials and Superconductivity, Obertraun; 12.02.2017 - 18.02.2017.

While there are quite a lot of analytical techniques at the chemists´ hand to gain information about substances synthesized or discovered in nature, single-crystal X-ray diffraction is still the only way to reliably determine the structure of those molecules. The downside of this technique, which is the requirement of being able to grow single crystals of the analyte, has partly been overcome by what is commonly called the "crystalline sponge method" which was introduced by Fujita et al. in 2013. This method is currently limited to smaller molecules, since the cavities in the metal-organic framework of which the crystalline sponges exist are too small to incorporate bigger structures. We plan to exchange the ligands used by Fujita et al. with more space-consuming structures in order to be able to use the crystalline sponge method to characterize numerous iron (II) spin-crossover compounds synthesized by our group that are difficult or even impossible to crystallize. Among others, we are investigating
different synthetic routes towards to the two candidate ligands 2,4,6-tris(pyridin-4-ylethynyl)-1,3,5-triazine and 2,4,6-tris((4-(pyridin-4-ylethynyl)phenyl)ethynyl)-1,3,5-triazine, as these are expected to form metal-organic frameworks with the same metal salts that were used for the original crystalline sponges in the literature. Once the extended-cavity sponges have been synthesized, we hope to be able to determine the structure of numerous coordination complexes that we have previously synthesized.

crystalline sponges, spin crossover

http://publik.tuwien.ac.at/files/publik_258579.pdf