Topological isomerism in coordination polymers

Three coordination polymers formed between CuI and bpds [bpds = bis(4-pyridyl)disulfide] have been prepared and fully characterised illustrating rare examples of solvent dependent topological isomerism in [(CuI)(2)(bpds)](infinity); tetrahedral Cu4I4 cubane junctions are linked to give either necklace or tubular polymers.