摘要：

Dioxygen binding and activation at metal centers are of major importance in a wide range of catalytic and biological processes. Metal oxides and dioxygen complexes are potential intermediates or products during oxidation of metal atoms or clusters. Consequently, great effort has been devoted to the preparation and characterization of various metal oxides and dioxygen complexes. The structures, physicochemical properties, and reactivity of these species have been the subject of intensive experimental and theoretical studies,which have been described in numerous reviews.1-5 As the initially formed species in most metal oxidation processes,metal dioxygen complexes are of particular interest in light of their postulated involvement in oxygen carrier systems in biology. Dioxygen reacts with biological molecules at isolated metallic active sites in forming metal-dioxygen adducts. Due to the intrinsic chemical interest in understanding metal-dioxygen interactions, a host of transition metal-dioxygen complexes that are structural and functional analogues of biological dioxygen carriers have been synthesized and are spectroscopically and structurally characterized.Progress on the characterization of such transition metaldioxygen complexes stabilized by bulky ligands has been the subject of a series of recent reviews,2-5 which is beyond the scope of this review.

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