|Molar mass||285.14 g/mol|
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Pentaamine(nitrogen)ruthenium(II) chloride is an inorganic compound with the formula [Ru(NH3)5(N2)]Cl2. It is a nearly white solid, but its solutions are yellow. The cationic complex is of historic significance as the first compound with N2 bound to a metal center. [Ru(NH3)5(N2)2+ adopts a octahedral structure with C4v symmetry.
Preparation and properties 
- [Ru(NH3)5Cl]Cl2 + NaN3 → [Ru(NH3)5N2]Cl2 + ...
If it is to be used in situ, the cation can be made more conveniently from ruthenium(III) chloride and hydrazine hydrate:
- RuCl3 + 4 N2H4 → [Ru(NH3)5N2]2+ + ...
This N2 complex is stable in aqueous solution and has a relatively low ligand exchange rate with water. Being a d6 complex, the Ru-N bond is stabilized by the Pi backbonding, the donation of metal d-electrons into the N2 π* orbitals.
The dinitrogen ligand is not reduced to aqueous sodium borohydride. Nearly all known reactions of this compound are displacement reactions. Pentaamine(halogen)ruthenium(II) halides can be synthesized by treating [Ru(NH3)5N2]2+ with halide sources:
- [Ru(NH3)5N2]2+ + X- → [Ru(NH3)5X]+ + N2
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