Transition metal dinitrogen complex  From Wikipedia, the free
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navigation, search Structure of [Ru(NH3)5(N2)]2+.  Metal
dinitrogen complexes are a coordination compounds that contain
the dinitrogen (N2) as a ligand. In the area of coordination
chemistry, the atomic and diatomic forms of nitrogen are
distinguished, although otherwise "nitrogen" refers to N2.
Metal complexes of N2 have been studied since 1965 when the
first complex was reported by Allen and Senoff. This complex,
[Ru(NH3)5(N2)]2+ was synthesised from hydrazine hydrate and
ruthenium trichloride and consists of a 16e- [Ru(NH3)5]2+ centre
attached to one end of N2.[1] [2] Interest in such complexes
arises because N2 comprises the majority of the atmosphere and
because many useful compounds contain nitrogen atoms. Biological
nitrogen fixation probably occurs via the binding of N2 to a
metal center in the enzyme nitrogenase, followed by a series of
steps that involve electron transfer and p