Self-assembling metal complexes

Selenotrithionates, 2 256 Selenous acid, secondary bonding by, 15 19 Self-assembling metal complexes, 46 174-175, xee also Supramolecular copper (l)/silver (I) complexes... 

X. Nano-Sized Molecules Clusters, Fullerenes, and Self-Assembled Metal Complexes... 

X. NANO-SIZED MOLECULES CLUSTERS, FULLERENES, AND SELF-ASSEMBLED METAL COMPLEXES... 

S. Takamizawa, Preparation of stable microporous materials comprised of self-assembled metal complexes containing regularly-distributed pores useful as catalysts, (Yokohama TLO Company, Ltd., Japan). 2004, 2003-141474,2004043454... 

Metal-directed Self-assembly of Complex Supramolecular Architecture Chains, Racks, Ladders, Grids, Macrocycles, Cages, Nanotubes and Self-intertwining Strands (Helicates)... 

Metal-directed self-assembled cyclic complexes can exhibit remarkable... 

Having accomplished the synthesis (Figure 2.1.6), the next task was to prove the formation of the self-assembled metal coordination complexes. This was achieved by NMR and ESI-MS experiments and elemental analysis and in one instance we were even able to perform X-ray structure analysis (Figures 2.1.7-2.1.9). 

Square structures are prepared from metal complexes containing the required 90° angle. Shown in Scheme 4, neutral-charged molecular square 37 is prepared by spontaneous self-assembly of complex 30 and 36 <1997JA2524>. Synthesis of precursor complex 30 is accomplished by coupling of Pt(ll) chloride 34 and ethynylpyridine anion 35. 

Self-assembling metal rotaxane complexes of a-cyclodextrin, R. S. Wylie and D. H. 

ABSTRACT. Two aspects of the self-assembly of complex structures around labile metal ions are discussed. Some experimental methods, including ion-spray mass... 

Lanthanides in Living Systems Lanthanides Coordination Chemistry Lanthanides Luminescence Applications Lmninescence Lanthanides Magnetic Resonance Imaging Lanthanide Oxide/Hydroxide Complexes Carboxylate Lanthanide Complexes with Multidentate Ligands Rare Earth Metal Cluster Complexes Supramolecular Chemistry from Sensors and Imaging Agents to Functional Mononuclear and Polynuclear Self-Assembly Lanthanide Complexes. 

Articles by Sweigart and coworkers have shown that manganese tricarbonyl complexes of r -hydroquinone deprotonate to give ii -semiquinone and q -quinone complexes. " " Solution NMR analysis and crystal structures of the q -semiquinone complex indicated that this complex was polymeric due to strong intermolecular hydrogen bonding, as shown in scheme 29 Reaction of the q -semiquinone and the q" -quinone complexes allowed the production of one-, two- and three-dimensional polymers. These complexes have also been shown to self-assemble by complexation of the oxygen atoms with transition metal ions. 

The mesogen structures may be formed not only by covalent bonds, but also by non-covalent interactions, such as hydrogen bonds, ionic interactions, and metal coordination [71]. A recent example [72] of this concept comprised the self-assembly of complex salts into stable hierarchical aggregates with a dense core and a diffuse shell. These materials were made from diblock copolymers poly(acrylic acid)-block-poly(acrylamide) and the cationic surfactant dodecyltrimethylammonium. Due to non-covalent interactions the surfactant/polymer aggregates exhibited a liquid crystalline structure of cubic symmetry. 

Figure Bl.22.3. RAIRS data in the C-H stretching region from two different self-assembled monolayers, namely, from a monolayer of dioctadecyldisulfide (ODS) on gold (bottom), and from a monolayer of octadecyltrichlorosilane (OTS) on silicon (top). Although the RAIRS surface selection rules for non-metallic substrates are more complex than those which apply to metals, they can still be used to detemiine adsorption geometries. The spectra shown here were, in fact, analysed to yield the tilt (a) and twist (p) angles of the molecular chains in each case with respect to the surface plane (the resulting values are also given in the figure) [40].

Fabricating and repairing complex materials systems. Mechanical methods currently in use (e g., riveting of metals) cannot be applied reliably to the composite materials of the future. Chemical methods (e g., adhesion and molecular self-assembly) will come to the fore. 

---