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The overall topology of coordination polymers can be controlled by means of the coordination preferences of the metal center and the structure of the bridging ligand. This is demonstrated here by the synthesis of a single-stranded helical coordination polymer by the self-assembly of the exo-ditopic ligand 1 and silver ions.

A one-pot synthesis of three new macrocycles containing two, three or four 2,2'-bipyridine units is described; the X-ray analysis of the bis-bipyridine ligand reveals a cyclophane type structure; the X-ray structure of one of the diastereoisomers of the dinuclear ruthenium complex is also described and shows two metal centres held in close proximity.

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