View all references 33. Lindoy , LF 1997. Tailoring macrocycles for metal ion binding. Pure and Appl. Chem., 69: 2179 [CrossRef], [Web of Science ®] View all references We now report the synthesis and characterization of a new series of related macrocyclic ligands 1 through 4, in which one or two xylyl groups have been incorporated in their ring structures. These semiflexible ring systems, incorporating both π??aryl and hydrogen??bond acceptor sites (or donor sites ...