Supramolecular assemblies of multi-nuclear transition metal complexes: Synthesis and redox properties
2014
Abstract The synthetic features of supramolecular assemblies comprised of multi-nuclear transition metal complexes were reviewed by classification of the reaction patterns: (1) substitution reaction by bridging ligands, (2) substitution reaction by monodentate ligands, and (3) coupling reaction of functional groups attached to peripheral ligands. Architectural control for assembling multi-nuclear units is difficult because of the complicated ligand substitution reactions of metal clusters, but controlled ligand substitution of multi-metallic complexes recently became a targeted subject of coordination chemistry by introducing suitable bridging and monodentate ligands to keep multi-metallic entities intact, leading to the formation of 1D, 2D, and 3D supramolecules of multi-metallic units. Another synthetic protocol is aimed at transition metal-catalyzed coupling reactions of peripheral ligands that provide selective oligomerization of multi-metallic complexes. These supramolecules are of particular interest because of their unique redox properties centered at multi-metallic units, and their redox behaviors are described.
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