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Dicarboxylate-Bridged Ruthenium Complexes as Building Blocks for Molecular Nanostructures
(Amer Chemical Soc, 2012) Kılbaş, Benan; Mirtschin, Sebastian; Johannessen, Thomas Riis; Scopelliti, Rosario; Severin, Kay
Ruthenium complexes with bridging dicarboxylate ligands were combined with 1,2-di-4-pyridylethylene (dpe), 2,4,6-tri-4-pyridyltriazine (4-tpt), or 2,4,6-tri-3-pyridyltriazine (3-tpt) to give a tetranuclear rectangle or hexanuclear coordination cages. The cages display a trigonal-prismatic geometry, as evidenced by single-crystal X-ray crystallography. The 4-tpt-based cages are able to encapsulate polyaromatic molecules such as pyrene, triphenylene, or coronene, whereas the 3-tpt-based cages were found to be incompetent hosts for these guests.
A solvent-responsive coordination cage
(Royal Soc Chemistry, 2012) Kılbaş, Benan; Mirtschin, Sebastian; Scopelliti, Rosario; Severin, Kay
The solvent-induced structural rearrangement of synthetic supramolecular structures typically requires a pronounced change in solvent polarity. We describe a ruthenium-based coordination cage, whose geometry and topology can be altered dramatically by using two closely related solvents: chloroform and dichloromethane. In chloroform, we observe an octanuclear prismatic cage, whereas a tetranuclear complex is formed in dichloromethane. The basis of this unusual solvent-sensitivity is the incorporation of metallacrown recognition units into a flexible, kinetically labile nanostructure.