Lichtgedanken 03

Rubrik 57 03 | LICHT GEDANKEN Contact Prof. Dr Winfried Plass, Oluseun Akintola Institute for Inorganic and Analytical Chemistry Humboldtstr. 8, D-07743 Jena, Germany Phone: +49 36 41 9-48 130 Email: Sekr.Plass@uni-jena.de www.plass.uni-jena.de Original Publication A robust anionic pillared-layer frame- work with triphenylamine-based linkers: ion exchange and counterion-dependent sorption properties, CrystEngComm (2017), DOI:10.1039/C7CE00369B adds: »This produces a three-dimen- sional crystal, the volume of which is more than 50 per cent cavities.« Various tiny ions or molecules can be embed- ded in these cavities. »The properties of the polymer change according to the properties of these guest molecules,« says Plass. Such porous framework substances, or MOFs (Metal-Organic Frameworks), were not invented in Jena, but have been known in a variety of forms for some years. The novel feature of JUMP-1, howe- ver, is that the linking molecules are redox-active: they can give up single electrons, which makes it possible to control the magnetic properties of the layers of cobalt ions. Furthermore, po- sitively charged counter-ions can be selectively embedded in the overall ne- gatively charged polymer framework. These positively charged ions regulate the capacity of the lattice framework to take up guest molecules and, as it were, selectively open and close the »door« to the pores. »In this way, we can fashion the polymer to fit the possible applicati- on,« says Plass. Future switchable magnetic materials could be used, for instance, as highly sensitive sensors for small charged molecules. Thanks to their appreciable interior surface area, such polymers could also be of use as catalyst for che- mical reactions.