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Dinitrogen complexes are coordination compounds in which molecular nitrogen, N₂, acts as a ligand and coordinates to a metal through donation of its lone pair and, in many cases, back-donation from filled metal d-orbitals into the antibonding π* orbitals of N₂. The ability of a metal to form such complexes depends mainly on its oxidation state, electron configuration, availability of vacant coordination sites, and capacity for π back-bonding. Transition metals, particularly those of the middle and later parts of the transition series, form a large number of dinitrogen complexes. Metals such ________ ____ ____ ________ __________ ___.
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