Practical Synthesis and Properties of 2,5-Diarylarsoles

2,5-Diarylarsoles
were easily synthesized from nonvolatile arsenic
precursors. Diiodoarsine was generated in situ and reacted with titanacyclo­penta­dienes
to give 2,5-diarylarsoles. The structures and optical properties were
studied in comparison with those of 2,5-diarylphosphole. It was found
that the arsoles were much more stable in the air than the phosphole.
Single crystal X-ray diffraction revealed the arsenic atoms adopted
a trigonal pyramidal structure, reflecting on the s-character of the
lone pair. The obtained 2,5-diarylarsoles and 2,5-diarylphosphole
showed intense emission in solutions and solid state. In addition,
the optical properties were controlled by transition-metal coordination.

2,5-二芳基砷咯（2,5-Diarylarsoles）可由非挥发性砷前驱体便捷合成。二碘砷烷（diiodoarsine）经原位生成后，与钛杂环戊二烯（titanacyclopentadiene）反应得到2,5-二芳基砷咯。研究人员将该类化合物的结构与光学性质与2,5-二芳基磷咯（2,5-diarylphosphole）进行对比分析，发现砷咯在空气中的稳定性远高于磷咯。单晶X射线衍射（single crystal X-ray diffraction）表征显示，砷原子采取三角锥构型，该结构特征反映了其孤对电子的s轨道成分。所制备的2,5-二芳基砷咯与2,5-二芳基磷咯在溶液及固态下均表现出强发光特性。此外，这类化合物的光学性质可通过过渡金属配位（transition-metal coordination）进行调控。