Polynitrogen Compounds

A great deal of information exists on the syntheses of macrocyclic polynitrogen compounds and it would be redundant to present it here. Outside of the rather specific examples chosen for inclusion here, the reader is directed to the book edited by Melson " and to any of the other numerous reviews cited at the end of this chapter . ... 

Debitus, C. Cesario, M. Guilhem, J. Pascard, C. Pa fe, M. (1989) Tetrahedron Lett., (1989) Corallistine, a new polynitrogen compound from the sponge Corallistes fulvodesmus. Tetrahedron Lett., 30, 1535-8. 

The nomenclature,particularly of complex compounds, is not always satisfactory in spite of the good work of the nomenclature commissions of the International Union of Pure and Applied Chemistry. Occasionally, a competent chemist would, not be able to write the correct structure based on a given name. This is particularly noticeable in the naming of open chain and cyclic polynitrogen compounds... 

Other polynitrogen compounds containing the pentazole ring system 743... 

The availability of ever faster computers is responsible for the continuously improving quality in the calculations of the stability and the properties of pentazole compounds. Azidopentazole has been identified as the most stable of the known Ns polynitrogen compounds and considerable work has gone into the question whether a pentazole salt of the Ns+ ion would be stable. 

R. J. Bartlett, S. Fau, M. Tobita, K. Wilson, and A. Perera. A survey of results for neutral and ionic polynitrogen compounds from N2 to N10 is available from http //www.qtp.ufl.edu/ bartlett/polynitrogen.pdf. 

One of the most interesting candidates for a HEDM among the polynitrogen compounds is tetraazatetrahedrane [N4(7rf)]. The energy release involved in the dissociation of this N4 isomer into N2 has been estimated to more than 180 kcal/mol [16], Despite the incredibly high energy content, the... 

It would be particularly interesting to take polynitrogen compounds into consideration (100 % N). However, no other modification of nitrogen except N2 is known which is metastable under normal conditions (1 atm, 298 K) in the condensed phase. 

It is interesting to note at this point that polynitrogen compounds are not only of great interest as explosives, but also as rocket propellants. For example, a specific impulse of 408 s and a combustion chamber temperature of 7500 I< have been predicted for N4 (rd) (and for N8 an 7sp of 500 s). From experience, since an increase in the specific impulse of 20 s results in a doubling of the payload, this would be a massive improvement. Furthermore, since polynitrogen compounds exhibit smoke-free combustion, they are also of big interest for tactical rockets. 

The investigation of the New Caledonian lithistid sponge Corallistes fulvodesmus led to the isolation of two polynitrogen compounds, 1-methyl-pteridine-2,4-dione, previously known as a synthetic product... 

Since polyphosphorus species are far more common than polynitrogen compounds, in contrast to their order of appearance in the periodic table (N, P, As, Sb, Bi), here we discuss the neutral homopolyatomic phosphorus compounds first. As stated above, phosphorus occurs in three main forms white, black, and red. White phosphorus consists of tetrahedral P4 molecules (Fig. 1) and forms a molecular lattice that melts already at 44°C, and even the boiling point is rather low at 280°C. In accord with its molecular structure, P4 is soluble in many organic nonpolar solvents but is insoluble in water—indeed, P4 is usually stored under water because it is spontaneously flammable in air. 

Polynitrogen compound N AsF was synthesized in 1999 and calculations showed that the most stable isomer has a V-shaped structure as shown. 

---