A principle for the assembly of novel mononuclear building blocks for supramolecular chemistry

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Abstract
The controlled assembly of supramolecular coordination oligomers may be achieved by the use of multinucleating ligands which contain two or more metal-binding domains. Examples of such ligands commonly consist of discrete metal-binding sites linked by appropriate spacers. We now show that a consideration of the donor properties of a ligand and the acceptor properties of a metal ion may be used to induce multinucleating behaviour in oligopyridine ligands which conventionally chelate to single metal centres. Such species are key building blocks for the assembly of a variety of supramolecular species in which the non-coordinated donor atoms may later interact with other metal centres. The crystal structure of the complex [Ru(bpy-N,N′)2(tpy-N,N′)][PF6]2 ( P 1, a = 8.367(2), b = 11.821(4), c = 19.398(5)Å, α = 93.83(2), β = 92.25(2), γ = 89.62(2)°, Z = 2, d c = 1.63 g cm−3, 5084 unique observed reflections with I < 1.5σ(I), R = 0.0745) which contains a bidentate tpy ligand is presented.

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