Synthesis, Solid-State Structure, and Bonding Analysis of a Homoleptic Beryllium Azide

[Ph4P](2)[Be(N-3)(4)] (1) and [PNP](2)[Be(N-3)(4)] (2; PNP= Ph3PNPPh3) were synthesized by reacting Be(N-3)(2) with [Ph4P]N-3 and [PNP]N-3. Compound 1 represents the first structurally characterized homoleptic beryllium azide. The electronic structure and bonding situation in the tetraazidoberyllate dianion [Be(N-3)(4)](2-) were investigated by quantum-chemical calculations (NPA, ELF, LOL).