Metal complexes of biologically important ligands, CLXXIV [1]. Palladium(II) and platinum(II) complexes with schiff bases from 2-(Diphenylphosphino)benzaldehyde and a-amino acid esters

Abstract

A series of palladium(II) and platinum(II) complexes Cl2M(P-N-O) (M = Pd, Pt) with bidentate Schiff bases (P-N-O) from 2-(diphenylphosphino) benzaldehyde and a-amino acid esters has been synthesized, using PdCl 2 or K[PtCl3(C2H4)], respectively. Abstraction of chloride from Cl2M(P-N-O) (using AgBF4) has afforded the cationic complexes [(P-N-O)M(Cl)]+BF4- in which the Schiff bases function as tridentate ligands with coordination of the ester group. The structures of Cl2Pd(Ph2PC 6H4C(H)=N-CH2CO2Et) and of [(Cl)Pd(Ph2PC6H4C(H)=NC( H)(CH 2CH=CH2)CO2Me)]+BF4- have been determined by X-ray diffraction. Complexes (L)MCl 2 and [(L)MCl]+BF4 (M = Pd, Pt) have also been prepared with the reduced Schiff base Ph2PC6H 4CH2NHC(H)(CH2Ph)CO2Me. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.