Transition metal chemistry of phosphorus based ligands. Ruthenium(II) chemistry of bis(phosphino)amines, X 2PN(R)PX 2 (R=H or Ph, X=Ph; R=Ph, X 2=O 2C 6H 4)

Abstract

Reactions of CpRuCl(PPh 3) 2 with bis(phosphino)amines, X 2PN(R)PX 2 ( 1 R=H, X=Ph; 2 R=X=Ph; 3 R=Ph, X 2=O 2C 6H 4) give neutral or cationic mononuclear complexes depending on the reaction conditions. Reaction of 1 with CpRuCl(PPh 3) 2 gives one neutral complex, [CpRu(Cl)( η 2-Ph 2PN(H)PPh 2)] ( 4) and two cationic complexes, [CpRu( η 2-Ph 2PN(H)PPh 2)( η 1-Ph 2PN(H)PPh 2)]Cl ( 5) and [CpRu(PPh 3)( η 2-Ph 2PN(H)PPh 2)]Cl ( 6), whereas the reaction of 2 with CpRuCl(PPh 3) 2 leads only to the isolation of cationic complex, [CpRu(PPh 3)( η 2-Ph 2PN(Ph)PPh 2)]Cl ( 7). The catechol derivative 3, in a similar reaction, affords an interesting mononuclear complex [CpRu(PPh 3){ η 1-(C 6H 4O 2)PN(Ph)P(O 2H 4C 6)} 2]Cl ( 8) containing two monodentate bis(phosphino)amine ligands. The structural elucidation of the complexes was carried out by elemental analyses, IR and NMR spectroscopic data.