# Isolation of Potassium Bis(amido)diazadipnictogenide Salts

## TL;DR

This paper reports the synthesis and characterization of new potassium salts containing substituted diazadipnictogen rings derived from Zintl phases and 1-azido-4-bromobenzene.

## Contribution

The study introduces new potassium bis(amido)diazadipnictogenide salts and their unique monomer-dimer behavior in different states.

## Key findings

- Arsenic derivatives show monomer-dimer interconversion between solid and solution states.
- Phosphorus derivatives form a stable dimeric structure in both solid and solution phases.
- Amido-(imino)-arsenide reacts with CO2 and CS2 to form carbonate and thiourea derivatives.

## Abstract

The reaction of Zintl
phases K3As7 and K3P7 were
investigated with 1-azido-4-bromobenzene
(4-BrC6H4N3) and found to yield potassium
salts of substituted diazadipnictogen rings (general molecular fragment
{(RN)2Pn2}; Pn = P, As). In the case of the
arsenic derivatives, amido­(imino)­arsenide persists in solution and
bis­(amido)­diazadiarsenide persists in the solid state. These two species
can be considered to share a monomer–dimer relationship, accessible
by alteration between the solid and solution states, whereas in the
case of K3P7, our crystallographic and spectroscopic
studies are consistent with the formation of a bisamido­(bisimino)­diazadiphosphenide,
the “dimeric” form, persisting in both the solid and
solution phase. Subsequent reactivity studies with amido­(imino)­arsenide
show that it can act as a source of amide anion, giving a carbonate
and a thiourea derivative when investigated with CO2 and
CS2, respectively.