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transition metal dioxygen complex
Dioxygen complexes are coordination compounds that contain O2 as a ligand.〔
〕〔Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.〕 The study of these compounds is inspired by oxygen-carrying proteins such as myoglobin, hemoglobin, hemerythrin, and hemocyanin.〔S. J. Lippard, J. M. Berg “Principles of Bioinorganic Chemistry” University Science Books: Mill Valley, CA; 1994. ISBN 0-935702-73-3.〕 Several transition metals form complexes with O2, and many of these complexes form reversibly.〔Berry, R. E. "Reactivity and Structure of Complexes of Small Molecules: Dioxygen", Comprehensive Coordination Chemistry II, 2004, 1, 625-629.〕 The binding of O2 is the first step in many important phenomena, such as cellular respiration, corrosion, and industrial chemistry. The first synthetic oxygen complex was demonstrated in 1938 with cobalt(II) complex reversibly bound O2.
==Mononuclear complexes of O2==
O2 binds to a single metal center either “end-on” (η1-) or “side-on” (η2-). The bonding and structures of these compounds are usually evaluated by single-crystal X-ray crystallography, focusing both on the overall geometry as well as the O---O distances, which reveals its bond order.
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