The structures of the oxides of nitrogen ${\mathrm{N}}_2{\mathrm{O}}_3$,${\mathrm{N}}_2{\mathrm{O}}_4$ and${\mathrm{N}}_2{\mathrm{O}}_5$  are as follows: 
The oxide molecules of ${\mathrm{N}}_2{\mathrm{O}}_3$ ,${\mathrm{N}}_2{\mathrm{O}}_4$  have nitrogen - nitrogen bond in their structure. ${\mathrm{N}}_2{\mathrm{O}}_5$ has nitrogen-oxygen-nitrogen bond in its structure.