A poly(bicyclic dimer) and a cyclic tetramer: Ligand isomerism of S2O2 macrocycles during the assembly of supramolecular silver(I) complexes

摘要

Two isomeric S2O2 macrocycles (L-1 and L-2) with a 14-membered cavity have been synthesised as a model system with different binding modes. Self-assembly reactions of L-1 and L-2 with silver perchlorate afford the respective ligand-directed cyclic oligomer complexes with different shapes: a poly(bicyclic dimer) (1) and a discrete cyclic tetramer (2). The formation of these supramolecular complexes is discussed in terms of conformational discrimination of two isomeric macrocycles due to ring rigidity and interdonor distances. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).