Regioselective metal-directed self-assembly of a prototype double helical hairpin dinuclear complex

A new type of covalently linked bis(oligopyridine) ligand, 4, has been prepared with a spacer group long enough to allow the formation of double helical M2L complexes; the solid-state structure of [Cu-2(4)][PF6](3) shows regioselective formation of the ``head-to-tail`` hairpin complex. (C) 2004 Published by Elsevier B.V.

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