106 CHEMICAL PROPERTIES AND COMPOSITION 



H H 



X\ and Ij- 



00 00 



In all superoxides, such as acetyl superoxide, 

 (aH 3 .0) 0-0 (C 2 H 3 0), 



the same easy decomposition is observed. 



In trivalent nitrogen it is especially the group 



N = N, 



that breaks up with large evolution of heat. Among the 

 data given above we have the example of 



N 



H 



In the same way the diazo-bodies are explosive, e.g. 

 diazo-benzene nitrate 



C 6 H 5 N = NONO,. 



In quadrivalent carbon it is the combination 



c = c, 



which is the essential cause of explosion, and has already, 

 on p. 1 02, been shown to involve a large absorption of 

 heat. Table, p. 105, contains two such bodies 



HCEECH and AgC = CAg. 



The explosive character depending on this has been found 

 also by Baeyer 1 in poly acetylene derivatives, such as 

 diacetylene di-iodide C 4 I 2 . 



The combinations of two elements that cause explosibility 

 are mainly those given in the table above, and there 

 remain to be mentioned only a few important, more 

 complex groups that are connected with them. 



The strained position in combination of nitrogen and 

 oxygen which showed itself in the table in the negative 



1 Berl. Ber. 18. 2276. 



