Metal-mediated assemblies

In this synthetic strategy, supramolecular interactions are used to construct the catalyst backbone. The approach can be used for a wide variety of catalysts, and mechanistic effects include catalytic supramolecular assemblies, self-assembly, metal-mediated catalysis and organocatalysis, and chiral induction. 

Keywords Multi-porphyrin assemblies Metal-mediated assemblies ... 

Ercolani G (2006) Thermodynamics of Metal-Mediated Assemblies of Porphyrins 121 167— 215... 

Iengo E, Scandola F, Alessio E (2006) Metal-Mediated Multi-Porphyrin Discrete Assemblies and Their Photoinduced Properties 121 105-143 Itoh M, Taniguchi H (2007) Ferroelectricity of SrTiC>3 Induced by Oxygen Isotope Exchange. 124 89-118... 

A review13 with 53 references of the transition-metal mediated supramolecular self-assembly is presented. Focus is on the self-assembly of macrocycles, catenanes, and cages from (en)Pd(N03)2 and pyridine-based bridging ligands. 

Figure 87 A host cage, constructed through transition metal mediated self-assembly from six metal ions and...

Stang, P. J. Olenyuk, B. Transition-metal-mediated self assembly of discrete manoscopic species with well-defined structures and shapes. In Handbook of Nanostructured Materials and Nanotechnology, Nalwa, H. S.. Ed. Academic Press San Deigo, 2000, Vol. 5, 167-224. 

In the first case, the details of network build-up and modification of network structure described above are not very important. The main aim of crosslinking is to keep the dendritic structures together permanently. Formation of three-dimensional nanostructures by metal-mediated self-assemblage can serve as an example Exo-tridentate tripyridyl compounds self-assemble upon treatment with (en)Pd(N03)2 [66]. 

In the specific case of calixarenes, there are very few studies related to metal-mediated self-assembly into cage molecules. Early examples reported by Shinkai and coworkers include bis(acac)-calix[4]arene dimer (1) held together by Cu2+ cations... 

Scandola F, Chiorboli C, Prodi A, Iengo E, Alessio E. Photophysical properties of metal-mediated assemblies of porphyrins. Coord Chem Rev 2006 250 1471-96. 

Calcium-binding Proteins Copper Enzymes in Denitrification Copper Proteins with Type 1 Sites Copper Proteins with Type 2 Sites Iron Heme Proteins Electron Transport Iron-Sulfin Proteins Metal-mediated Protein Modification Metallochaperones Metal Ion Homeostasis Molybdenum MPT-containing Enzymes Nickel Enzymes Cofactors, Nitrogenase Catalysis Assembly Zinc Enzymes. 

Figure 8 Ring-and-strings self-assembly filamentous ligand (17) combines with cyclic ligand (18) to form pseudorotaxane [Cu(17)(18)]+ upon treatment with Cu1. Multiple-interaction self-assembly (uni-/metal-mediated) combining (17), (18), Cu1 and Ru11 generates the catenane (19).

Two main types of multiple-interaction self-assembly have been demonstrated 25 (i) those involving the formation of two or more different types of coordinate bonds (metal-mediated or... 

This chapter will highlight recent efforts to develop metal-mediated processes for selective C-H amination. Other excellent, comprehensive reviews can be found on this topic [3, 8-10]. To distinguish this discourse from prior works, we have opted to focus attention on the diversity of catalysts that are now known to mediate racemic and asymmetric intra- and intermolecular oxidation reactions. Where possible, mechanistic insights that elucidate the role of the metal catalyst and the details of the defining bond-forming event will be presented. It is our hope that this analysis will serve to inspire additional inventive discoveries in this rapidly progressing field - advances that may change the art and practice of complex molecule assembly. 

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