Wuppertal, Universiẗat, Diss., 2002.

Hannover, Universiẗat, Diss., 2002.

Bielefeld, Universiẗat, Diss., 2002.

No description available.

No description available.

No description available.

This thesis details the silver(I) coordination chemistry of thirty four alkene-containing ligands. The synthesis of thirty two of these ligands is described of which fifteen are unreported compounds. The ligands were designed to fully explore the potential of the silver(I)-alkene synthon in metallosupramolecular chemistry. Five series of ligand were designed each exploring a different facet of ligand design. Three series explored different ligand cores which included benzene, naphthalene and single atoms such as carbon, oxygen and nitrogen. Another series explored ligands of higher denticity including tri-, tetra- and hexa-substituted benzenes. The last series investigated ligands with functional groups in addition to olefins, in particular, heterocyclic nitrogens. A metal-centred ligand was created from a bifunctional ligand subunit. The silver(I)-alkene synthon has been used to create a range of assemblies. Polymeric structures were favoured with a variety of one-dimensional polymers with linear, ladder, helical and necklace type structures. Two-dimensional networks were formed, with some showing porosity. Three-dimensional metallopolymers were formed, including an interpenetrated three-dimensional network. Discrete complexes are commonly of the type Ag2L2 but with the occasional formation of Ag2L. It is shown that silver(I)-alkene interactions can coexists with other stronger interactions such as silver(I)-nitrogen. The deliberate use of bifunctional ligands allowed the formation of many interesting assemblies including an Ag3L2 heterotopic helicate. A Cu(I) complex with copper(I)-alkene interactions was identified. Techniques used to characterise the ligands and complexes include NMR, mass spectrometry, elemental analysis and X-ray crystallography. The crystal structures of seven organic compounds and forty six complexes are discussed.

This study involved the investigation of C₃-hydrocarbon adsorption on a range of metal and supported metal surfaces using FTIR spectroscopy. The initial aim was to use 'model' metal surfaces i.e. single crystal and polycrystalline metals, to determine fingerprint spectra for various adsorption complexes of propene and propyne. These fingerprint spectra were then to be used to help determine the nature of surface species formed on 'real' industrial catalysts. The single crystal study involved adsorption of both propene and propyne on Pt(111) at temperatures of 90 K and >300K. Adsorption of propene on Pt(111) at 90 K yielded the first infrared spectrum of the di-σ propene surface complex. Spectra obtained at higher temperatures for this system provided the signature of the propylidyne species. Upon adsorption of propyne on Pt(111) at 90 K the fingerprint spectrum of a 'Type A' propyne surface complex was recorded. Adsorption of propene on thin polycrystalline films of copper and palladium, at low temperature was investigated using transmission infrared spectroscopy. In this study the first infrared spectra of the π-adsorbed propene complex were recorded. The second half of the study involved investigation of the surface species formed on 'real' industrial catalysts, i.e. Al₂O₃ and Pt/Al₂O₃. Infrared spectra were recorded for a wide range of surface species such as propene complexes, acrolein, acrylate, carboxylates, hydrogencarbonate, and carbonates. These results showed that the main surface chemistry involved on these catalysts was that of the oxide support and not that of the platinum metal.

Konstanz, Univ., Diss., 2007.

Wuppertal, Univ., Diss., 2003. / Computerdatei im Fernzugriff.