Dinitrogen compound

Since the first compound of this type, [Ru(NH2)5(N2)]Bt2 [15246-25-0] was synthesized (178), most transition metals have been found to form similar compounds (179,180). Many dinitrogen compounds are so stable that they ate unreactive toward reduction and so have Htde chance to form the basis of a catalytic system. 

Compounds (17) and (19) are formally 14-electron species. By contrast, the /z-dinitrogen complexes [ M (N2)(Cp )2 2(t/-N2)] (M = Ti, Zr) are respectively 16-electron and 18-electron species, and the low oxidation state of the metal is preserved. The spectroscopic data also illustrate the differences between the tantalum and these Tin or Zr11 /4-dinitrogen compounds. The l5N spectrum of (16) shows a singlet at 414p.p.m.,306 a chemical shift comparable to that... 

It is interesting to note that the anthracene-oil-base fraction contains heterocyclic compound types containing two nitrogens (33). This appears to be the first report of numerous SjH2N+ZN2 comPounc s i-n coal liquids. Minor amounts of dinitrogen compounds have been previously observed in these materials (34). 

Thus, diorgano tellurium dicyanates are treated as diorgano dinitrogen compounds (p. 637), however, it must be emphasized that this treatment is not intended to give information on the bonding mode. 

Thiocyanate groups can be linked to tellurium via the nitrogen or sulfur atoms. In view of this uncertainty, cyanates, thiocyanates, and selenocyanates are discussed together under diorgano dinitrogen compounds (p. 637). 

The ligand NNR has been referred to as alkyl- or arylazo, diazo, or diazenato, but diazenido is preferred. The aryl compounds are commonest they can be obtained from diazonium compounds (ArN2) and from hydrazines such as PhNNH2 or ArC(0)NNH. They are also formed by electrophilic or nucleophilic attacks on dinitrogen compounds, for example,... 

A historically important complex, that also depends on the jr-donor capacity as above, is [Ru(NH3)5(N2)]2+. This was the first dinitrogen compound to be recognized and it opened up an enormous development in N2 complex chemistry (see Section 9-9). Although originally made via hydrazine reduction of RuG3-/jH20, it is best prepared by the reactions... 

Treatment of (108) (R IV) with the dinitrogen compound Na[(N2)Mo(NButAr)3] provided the binuclear N2-bridged complex (110) (Scheme 20).193 Reduction of the latter produced the anion [L3NbN] (111) whose reaction with I2 in tol yielded a mixture of products frotn which cyclic [(L2Nb(/r2-N)]3 (112) was isolated. The latter contained both short (1.791(7)A) and long (2.004(6)A) Nb—N bonds.193... 

NMR for some dinitrogen compounds are presented in Table 11 while data for nitrosyl species appear in Table 10. These data suggest the following overall shielding order CO>P(Alk)3>P(Ar)3>N2>NJ s NCR > NO > N=NR > N-NRI . Clearly, all the terms in the Ramsey expression are important here. Few new data for nitrosyl and thionitrosyl compounds have been reported since the last review. ... 

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