Tunable Fullerene Affinity of Cages,Bowls and Rings Assembled by PdII Coordination Sphere Engineering |
| |
Authors: | Dr Bin Chen Dr Shinnosuke Horiuchi Dr Julian J Holstein Dr Jacopo Tessarolo Prof?Dr Guido H Clever |
| |
Institution: | 1. Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany;2. Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521 Japan |
| |
Abstract: | For metal-mediated host compounds, the development of strategies to reduce symmetry and introduce multiple functionalities in a non-statistical way is a challenging task. We show that the introduction of steric stress around the coordination environment of square-planar PdII cations and bis-monodentate nitrogen donor ligands allows to control the size and shape of the assembled product, from Pd2L4] cages over Pd2L3] bowl-shaped structures to Pd2L2] rings. Therefore, banana-shaped ligand backbones were equipped with pyridines, two different quinoline isomers and acridine, the latter three introducing steric congestion through hydrogen substituents on annelated benzene rings. Differing behavior of the four resulting hosts towards the binding of C60 and C70 fullerenes was studied and related to structural differences by NMR spectroscopy, mass spectrometry and single crystal X-ray diffraction. The three cages based on pyridine, 6-quinoline or 3-quinoline donors were found to either bind C60, C70 or no fullerene at all. |
| |
Keywords: | coordination cages fullerenes molecular recognition self-assembly supramolecular chemistry |
|
|