Synthesis of Cationic Transition Metal Complexes and Their Application to Transformation of Carbon Dioxide

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Transition metal complexes have been synthesized by using a newly developed bulky monodentate aryloxide ligand based on a rigid fused-ring s-hydrindacenyl skeleton. Their molecular structures have been confirmed by X-ray crystallography. The new cationic zirconium complexes showed an improved catalytic ability for hydrosilylation of carbon dioxide, comparing with those of the previously reported catalysts having multidentate ligands. Theoretical calculations were performed to examine the reaction mechanism for the chemical reduction of carbon dioxide. Also olefin polymerization reactions have been studied with the use of cationic transition complexes.