Binary interpnictogen compounds bearing diaryl bismuth fragments bound to all lighter pnictogens.

Multiple interpnictogen compounds with covalent single bonds between a diarylbismuth fragment and all lighter pnictogens were prepared from the corresponding diarylhalido bismuthanes. The aminobismuthanes PhBiNMe (1) and MesBiNMe (2) (Mes = 2,4,6-trimethylphenyl-) have been obtained a salt metathesis reaction and compound 2 was successfully reacted with BuNH in a condensation reaction to yield MesBiNHBu (3). The bismuthanyl phosphanes ArBiPBu (Ar = Ph: 4 and Ar = Mes: 5) and arsanes ArBiAsBu (Ar = Ph: 8 and Ar = Mes: 9) were also obtained salt metathesis. Through a trimethylsilyl halide abstraction reaction of the diaryl halido bismuthanes and EBu(SiMe) (E = P and As), the bismuthanyl phosphanes ArBiPBu(SiMe) (Ar = Ph: 6; Ar = Mes: 7) and the arsanes ArBiAsBu(SiMe) (Ar = Ph: 10; Ar = Mes: 11) have been prepared. Bismuthanyl stibanes were accessed a condensation reaction of MesSbH with 1 or 2, respectively. The compound PhBiSbMes (12), which has different substituents at the bismuth and antimony atoms, was isolated and fully characterised. In contrast, the isolation of MesBiSbMes (13) was not possible due to a dynamic equilibrium with MesBi and MesSb which was investigated low-temperature H-NMR spectroscopy in solution. The isolated compounds with a single bond between bismuth and the heavy pnictogens arsenic and antimony are rare examples of their kind. All isolated compounds (1-12) were characterised by NMR and IR spectroscopy, mass spectrometry, elemental analysis and single crystal X-ray diffraction.