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Host-guest chemistry is usually carried out in either water or organic solvents. To investigate the utility of alternative solvents, three different coordination cages were dissolved in neat ionic liquids. By using 19F NMR spectroscopy to monitor the presence of free and bound guest molecules, all three cages were demonstrated to be stable and capable of encapsulating guests in ionic solution. Different cages were found to preferentially dissolve in different phases, allowing for the design of a triphasic sorting system. Within this system, three coordination cages, namely Fe4L6 2, Fe8L12 3, and Fe4L4 4, each segregated into a distinct layer. Upon the addition of a mixture of three different guests, each cage (in each separate layer) selectively bound its preferred guest. [ABSTRACT FROM AUTHOR]

Würfel: Das rationale Design eines einfachen Satzes von organischen Untereinheiten führte zur Bildung einer kubischen M8L1216+ ‐ Kapsel nach Selbstorganisation mit Eisen(II) ‐ Ionen. Durch Änderung der Länge der Alkylketten der Untereinheiten wurde die Löslichkeit der assemblierten Strukturen in unpolaren Lösungsmitteln wie Cyclohexan stark erhöht, und die Strukturen zeigten lösungsmittelabhängige Wirt ‐ Gast ‐ Wechselwirkungen. [ABSTRACT FROM AUTHOR]

The subcomponent self-assembly of a bent dialdehyde ligand and different cationic and anionic templates led to the formation of two new metallosupramolecular architectures: a Fe(II) 4 L6 molecular rectangle was isolated following reaction of the ligand with iron(II) tetrafluoroborate, and a M5 L6 trigonal bipyramidal structure was constructed from either zinc(II) tetrafluoroborate or cadmium(II) trifluoromethanesulfonate. The spatially constrained arrangement of the three equatorial metal ions in the M5 L6 structures was found to induce small-molecule transformations. Atmospheric carbon dioxide was fixed as carbonate and bound to the equatorial metal centers in both the Zn5 L6 and Cd5 L6 assemblies, and sulfur dioxide was hydrated and bound as the sulfite dianion in the Zn5 L6 structure. Subsequent in situ oxidation of the sulfite dianion resulted in a sulfate dianion bound within the supramolecular pocket., (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)