PAPER: Modular DNA-programmed assembly of linear and branched conjugated nanostructures

Gothelf, K. V.; Thomsen, A.; Nielsen, M.; Cló, E.; Brown, R. S.

J. Am. Chem. Soc. 2004, 126, 1044–1046, doi: 10.1021/ja038333u

Center for Catalysis and Interdisciplinary Nanoscience Center (iNANO), Department of Chemistry, Langelandsgade 140, Aarhus University, 8000 Aarhus C, Denmark,

Department of Molecular Biology, Gustav Wieds Vej 10C, Aarhus University, 8000 Aarhus C, Denmark

Abstract

A new strategy for self-assembly and covalent coupling of encoded molecular modules into nanostructures with predetermined connectivity has been developed. The method uses DNA-functionalized oligo(phenylene ethynylene)-derived organic modules for controlling the assembly and covalent coupling of multiple modules. Rigid linear modules (LM) and tripoidal modules (TM) were functionalized with short oligonucleotides at each terminus. They can hybridize and thereby link up modules containing complementary sequences. Each terminus of the oligo(phenylene ethynylene) modules also consists of a salicylaldehyde moiety, which can form metal−salen complexes with other modules. The salicylaldehyde groups of two modules are brought in proximity when their adjoining DNA sequences are complementary, and they selectively form a manganese−salen complex in the presence of ethylenediamine and manganese acetate. The resulting structures consist of a matrix of linear and branched oligo(phenylene ethynylene)s which are linked by conjugated and rigid manganese−salen complexes. These nanostructures are potential conductors for applications in molecular electronics.

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