Pentaammines characterization

A large variety of pentaammine, tetraammine, and triammine complexes have been prepared and characterized in recent years using the synthetic procedures outlined in Section II,B,4. The various classes of pentaammine complexes that have been prepared are summarized in the appropriate sections (Table I) (2, 47, 54-60, 66-71, 74, 75, 80, 85, 90, 118-120, 167-169, 171-181, 194-201). Dimeric and polymeric complexes are described in Section II,D. 

The first dinitrogen complex, characterized in 1965, resulted From the reduction of commercial ralherium inchloride [containing some Ru(lV)] by hydrazine hydrate. The pentaammine(dinitrogen)rutheniuni(Il) caiion that formed could be isolated in a variety of salts.Soon other methods were found to synthesize the complex, such as the decomposition of the pentaammineazido complex, [RuiNKjIjN J, and even direct reaction with nitrogen gas ... 

Although one might expect thiol (RSH) complexes to be more stable than HjS complexes, only a few well characterized examples have been reported. The analogs of the Ru" compounds (1) and (2) with EtSH have been prepared. By oxidation with silver trifluoroacetate the corresponding pentaammine-Ru complex can be obtained. Spectral evidence for the formation of thiol complexes has also been given, e.g. for the systems Fe"/PrSH and PhSH, Zn /BuSH and [Pt(pyz)Cl2]/ PhSH however, no further descriptions of the complexes were given,... 

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