The synthesis and crystal structures of ‘necklace’ 1-D coordination polymers with Cu2I2 nodes and ‘extended-reach’ heterocyclic bridging ligands

Reaction of three ‘extended-reach’ bridging ligands with copper(I) iodide consistently produced 1-D coordination polymers with a necklace-type connectivity. These all consist of large macrocyclic rings sharing Cu2I2 nodes. In one case a potentially tripodal ligand acts in a hypodentate mode, with a pendent non-coordinated arm inserted into the cavity of an adjacent macrocycle.