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Metallosupramolecular Polymers with Orthogonal Interactions
Kerstin Anhuth and Carsten Schmuck
Institute of Organic Chemistry, University of Duisburg-Essen, Universitätsstraße 7,
45141 Essen, Germany.
We present the synthesis of supramolecular polymers with two orthogonal binding sites
based on metal-ligand binding and zwitterionic interactions. The first building block is
the zwitterionic pyrrol derivative 1 which was developed by Schmuck. This compound
is a self-complementary binding motive with a highly stable binding constant in DMSO
and water. [1] The second building block is the 2,2´:6´2´´-terpyridine 2 which forms very
stable transitional-metal-complexes with impressive photophysically properties variable
through the choice of the metal. [2]
Figure 1: 2-(guanidiniocarbonyl)-pyrrol-5-carboxylate-zwitterion 1 [1] and the 2,2´:6´2´´-terpyridine 2.
By linkage of those two different building blocks it is possible to change the structure
from the monomer through chemical signals to oligomers and polymers. Due to the
right pH-range (about 6) dimers can be formed by zwitterionic interactions. The
addition of metal ions provides the formation of linear or net-like supramolecular
polymers.
Figure 2: Schematic design of a supramolecular polymer based on three self-complementary binding-sites.
[1] C. Schmuck, W. Wienand, J. Am. Chem. Soc. 2003, 125, 452-459.
[2] U. S. Schubert, C. Eschbaumer, Angew. Chem. 2002, 114, 3016-3050.