Rigid non-carbocyclic ligand supported complexes for the study of unusual metal-ligand interactions adn applications in catalysis

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Research in the Emslie group is directed towards the synthesis and study of unusual or unique metal complexes which are of interest from both a fundamental perspective and for the development of improved catalysts and new types of stoichiometric and catalytic transformation. To this end, our NSERC funded research program is focused on the synthesis, properties and reactivity of: (1) Borane-appended late transition metal complexes, and (2) Non-carbocyclic thorium and uranium complexes. While quite distinct, the use of ligand rigidity to create a very particular metal binding environment is of central importance in both areas.Research in area 1 involves the use of novel rigid ligands which incorporate both electron-donating groups and an electron-acceptor (a borane) arranged around a central metal binding pocket. Electron donor groups are selected in order to bind readily to late transition metals, thereby anchoring the metal in close proximity to the pendant borane. As a consequence of this unusual situation, a variety of bonding interactions between the borane and either the metal or the ligands bound to the metal can occur. Investigation of the properties and reactivity of the resulting complexes is of considerable importance to further our understanding of rare metal-ligand interactions, and for the development of new approaches in catalysis.In research area 2, our focus is on exploring the utility of extremely rigid and planar non carbocyclic ligands in thorium and uranium organometallic and redox chemistry. This research is directed towards the preparation of highly reactive complexes, in understanding the factors which control complex stability and reactivity, and in the discovery of new catalysts and catalytic reactions. Catalyst design is of great importance for the preparation of new chemicals and materials (e.g. pharmaceuticals, agrochemicals and plastics), and in the discovery of more efficient and environmentally friendly methods to prepare currently available chemicals and materials. Advances in fundamental understanding are of equal importance since they contribute to the knowledge base in chemistry upon which all future technologies are built.