Synthesis And Structural Characterization Of Metal Vanadium( ? ), And Rhodium( ? ) Complexes Bearing 1,2,4-diazaphospholide Ligands

Five-membered heterocyclic 1,2,4-diazaphospholide ligands with lone pair electrons,? electronics,aromaticity,and low coordination of phosphorus played an important role in the preparation of organometallic complexes.With the 1,2,4-diazaphospholide anions,a few of vanadium and rhodium complexes with this type of the ligand were synthesize,including low-valent vanadium species.All of complexes have been fully characterized by X-ray single crystal diffraction,NMR,EPR,magnetic susceptibility,and IR:1.The reaction of potassium 3,5-disubstituted-1,2,4-diazaphospholide and vanadium trichloride tetrahydrofuran in a ratio of 3:1,2:1,and 1:1 gave complexes [?THF?V?3,5-tBu₂dp?₃],[Cl?THF?₂V?3,5-tBu₂dp?₂],and [Cl₂?THF?₂V?3,5-tBu₂dp?],respectively.2.The reaction of potassium 3,5-di-phenyl-1,2,4-diazaphospholide and vanadium trichloride tetrahydrofuran in a ratio of 3:1,2:1,and 1:1 gave complexes [?THF?V?3,5-Ph₂dp?₃],[Cl?THF?₂V?3,5-Ph 2dp?₂],and [Cl₂?THF?₂V?3,5-Ph₂dp?],respectively.3.The reduction of [Cl₂?THF?₂V?3,5-tBu₂dp?] and [Cl₂?THF?₂V?3,5-Ph₂dp?] with C8 K gave two low-valent vanadium complexes [?THF?₂V?3,5-t Bu₂dp?₂] and [Cl?THF?₃V2?3,5-Ph₂dp?₃],respectively.4.The reaction of [Cp*RhCl₂] and potassium 3,5-di-phenyl-1,2,4-diazaphospholide complex gave a trimeric complex [Cp*Rh?3,5-Ph₂dp?]₃.