Isolation of a Stable Covalent Selenium Azide RSeN<sub>3</sub>

The first covalent selenium azide 2-Me<sub>2</sub>NCH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>SeN<sub>3</sub> has been synthesized and fully characterized including crystal structure determination. As shown by the experimental results, the relative stability of RSeN<sub>3</sub> highly depends on the nature of the coordinating ability of the substituent R, resulting in a heterocyclic zwitterionic structure.