Expanded Porphyrins - A New Approach to the Generation of Multi-centered Catalysts
Final Report Abstract
Novel multi-centered organic receptors have been synthesized by combining pyrrole with 2,2'-bipyridine and phenanthroline heterocycles. Conceivable binding sites of the molecules for cations (M) and anions (A) are observed. In the case of a pyrrolyl-substituted bipyridine, the molecule consists of two binding centers: One site is able to bind cations and the second one forms hydrogen bonds towards anions. In particular, the ruthenium(II) site of cationic receptor served as an efficient fluorescent probe for the selective sensing of phosphate anions. The anions were bound to the second site consisting of pyrrolic substituents. On the basis of this ruthenium receptor and an anionic fullerene C60 derivative a self-assembled donor-acceptor pair formed and was studied with respect to electronic communication. In a further project, a pyrrolyl-substituted phenanthroline was successfully used as an oxidation-induced trigger of inter-toward intramolecular hydrogen bonding.
Publications
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„Dipyrrolyl-functionalized bipyridine-based anion receptors for emission-based selective detection of dihydrogen phosphate", Chem. Eur. J. 2007, 13(5), 1374-1381
P. Plitt, D. E. Gross, V. M. Lynch, J. L. Sessler
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„Supramolecular Assemblies of Pyrrole-based Anion Receptors", Eurocores-Workshop on Self-Organised Nano Structures (SONS), Veilbronn, March 29, 2007
P. Plitt
