Selective synthesis of iridium( iii )-derived molecular Borromean rings, [2]catenane and ring-in-ring macrocycles via coordination-driven self-assembly

C NMR, 2D NMR, ESI-MS and elemental analyses. Single crystal X-ray structures of Borromean rings 1 and 3, and ring-in-ring macrocycle 7 revealed that the length and functionality of donors enabling CHπ and ππ interactions govern the topology.