In order to investigate dioxygen-activation with dimetal center, we have introduced a teterahedral distortion into the Cu
III2 (μ-O)
2 core by using (-) -Sparteine (Sp) . X-ray studies of these copper complexes with Sp revealed that these copper centers have tetrahedrally distorted structures, ranging over the oxidation states, and the monomer and bridged dimer forms, due to the steric requirements of the ligand. The Cu
III2 (μ-O)
2 complex with Sp exhibited unique spectroscopic properties due to its structural distortion. On the basis of theoretical studies on these systems, the relationships between the physical properties and tetrahedrally-distorted structures have been discussed.
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