Synthesis and characterization of novel platinum group metal complexes of bis[2-(diphenylphosphino)ethyl]amine

Abstract

A mixed donor tridentate ligand bis[2-(diphenylphosphino)ethyl]amine (DPEA) was synthesized in its hydrochloride form by a modified procedure and characterized by 1H, 13C and 31P NMR spectral data. Reaction of RhCl(CO)(PPh 3) 2 with DPEA · HCl and NaBPh 4 in methanol gave the cationic Rh(I) complex [Rh(DPEA)PPh 3IBPh 4 but the reaction of IrCl(CO)(PPh 3) 2 with DPEA · HCl in boiling benzene gave a unique complex, [Ir(H)(Cl)(CO)(DPEA)]Cl, in which five different donor atoms are coordinated to the single Ir(III) ion. A neutral, RH(III) complex of the composition [RhCl 3(DPEA)] was prepared by the reaction of RhCl 3 · xH 2O with DPEA · HCl in methanol. Reaction of PdCl 2(COD) with DPEA · HCl in benzene or methanol gave the cationic complex [PdCl(DPEA)]Cl the above reaction conducted in benzene-acetone-methanol mixture gave the 1:2 complex [Pd(DPEA) 2]Cl 2. A novel trinuclear Pt(II) complex of the composition [Pt 3Cl 3(DPEA) 3]Cl 3 was prepared by the reaction of K 2PtCl 4 and DPEA · HCl in water-acetone mixture. Reaction of K 2PtCl 4, DPEA · HCl and NH 4PF 6 in water ethanol mixture gave the binuclear, cationic complex, [Pt 2(DPEA) 3](PF 6) 4. All the complexes were characterized by elemental analysis, conductivity, 1H and 31P NMR spectral data.