Oligobipyridines

One may draw an analogy between nucleic acids and helicates, with on one side the polynucleotide strands and their interaction through hydrogen bonding and on the other side the oligobipyridine strands and their binding together via metal ion coordination. 

Fig. 49. Self-recognition in the self-asssembly of the double helicate 133 and the triple heli-cate 149 from a mixture of the oligobipyridine strands 129 and 148 and of Cu(l) and Ni(ll) ions (CIO4- anions omitted) [9.173].

Kramer R et al (1993) Self-assembly, structure, and spontaneous resolution of a trinuclear triple-helix from an oligobipyridine ligand and Ni(II) ions. Angew Chem Int Ed Engl 32 703-706... 

Self-recognition in the self-assembly of double-stranded helicates from a mixture of oligobipyridine strands. 

Like all simple triazolopyridines, bitriazolopyridines 76 react with electrophiles to produce 2,2 -bipyridines 118 (Scheme 24). With these reactions a general route to 2,2 -bipyridines has been discovered with a variety of substituents in the 6 and 6 positions (97T8257). These compounds have use in supramolecular chemistry because of their great complexing power for metal ions and, in particular, 2,2 -disubstituted-6,6 -bipyridines are useful building blocks for oligobipyridines, which spontaneously form helical metal complexes (92T8451). 

Lehn, J.-M. Rigault. A.M. Siegel. J. Harrowfield. J. Chevrier. B. Spontaneous assembly of double-stranded helicates from oligobipyridine ligands and copper(I) cations Structure of an inorganic double helix. Proc. Natl. Acad. Sci. U.S.A. 1987. 84 (9). 2565-2569. 

Baxter, P., Lehn, J. M., DeCian, A., and Fisher, J. (1993) Self-Assembly, Structure, and Sponteous Resolution of a Trinuclear Triple Helix from an Oligobipyridine Ligand and Ni(II) Ions, Angew. Chem., Int. Ed. Eng. 32, 703-706. 

Silver. The exchange of complexes of Ag with 2-Ph2PC5H4N has been investigated by P NMR spectroscopy. A H titration has been used to monitor the complexation of Cu and Ag with imine-bridged oligobipyridine ligands. The... 

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