Dinitrogen ammines

In this section we consider unsubstituted complexes first, then aqua, hydroxo, halo, carbonyl and phosphine ammines. For nitrido ammines see pp. 562, 563, nitrosylammines p. 546, and dinitrogen ammines p. 554. Other substituted ammines are dealt with under the section concerned with the substituting ligand. 

Nitric oxide reacts rapidly with osmium(IV) di- and tri-haloammines giving, via a diazotization reaction, osmium(III) dinitrogen ammine complexes (see p. 555).M At higher, pH, di- and tri-haloammines are unstable and undergo disproportionation reactions to osmium(III) haloammines and fra s-[0s02(NH3)4]2+.64... 

Historically, the most important ruthenium(II) ammine species is [Ru(NH3)5N2]2+, the first stable dinitrogen complex to be isolated (1965). It was initially obtained by refluxing RuC13 in hydrazine solution (but many... 

Replacement of the dinitrogen ligand in [Os(N2)(NH3)5]2+ by pyridine under aerobic conditions90 or of the weakly bound triflate ligand in [0s(0S02CF3)(NH3)5]2+ by pyridine62 yields [Os(py)(NH3)5]3+ cyclic voltammetric studies show reversible reduction to [Os(py)(NH3)5]2 + 62,90,91 and the surface-enhanced Raman spectrum91,92 (SERS) of the complex (both normal and deuteriated) shows Os-N, ammine and internal pyridine vibrational modes. Infrared spectra were also measured.91... 

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