Fig. 8: Isolobal phosphorous derivatives of complexes 4 and 5, R = anionic ligands, Silyl = [Ph(H)C(N^tBu)₂]Si.

Representative multiple-bonded phosphorous compounds such as diphosphanyl cations (Fig. 8, A) and stannaphosphenes (Fig. 8, B), which are isolobal to complexes 4 and 5.