Abstract
Guanidine-based ligands can be prepared by a very simple synthesis. These ligands are amenable, in principle, to wide variation and in the anionic form are able to bind three metal centers simultaneously at chelating sites in close proximity (see picture). An oligomer which contains 24 Cd centers, 12 of the ligands shown, and 6 ligands isomeric to them and which forms a doughnutlike ring with a diameter of >30 Å has been characterized.
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