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 α-amino acid esters has been synthesized, using PdCl2 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(Ph2PC6H4C(H)=N-CH2CO2Et) and of [(Cl)Pd(Ph2PC6H4C(H)=NC(H)(CH2CH=CH2)CO2Me)]+BF4− have been determined by X-ray diffraction. Complexes (L)MCl2 and [(L)MCl]+BF4 (M = Pd, Pt) have also been prepared with the reduced Schiff base Ph2PC6H4CH2NHC(H)(CH2Ph)CO2Me.
The synthesis of Cl 2 Pt[NH 2 (CH 2 ) n COOH] 2 (n = 5, 10) and the reactions of their carboxylic groups with H 2 N(CH 2 ) 17 CH 3 , d-glucosamine, and (R,R)-1,2-diaminocyclohexane to give complexes with 632 amino acid amides as ligands, are reported. Cl 2 Pd(histidine) is coupled with amino alcohols to give Cl 2 Pd(histidineamide) complexes.
The reactions of the chlorido-bridged complexes [Cp*M(Cl)(µ-Cl)] 2 (M = Rh, Ir) with Schiff bases (P-N-O) from 2-(diphenylphosphino)benzaldehyde and α-amino acid esters afford the complexes Cp*M(Cl) 2 (P-N-O) in which the ligands function as monodentate P donors (M = Ir) or as bidentate P-N donors (M = Rh). These complexes can be converted into cationic complexes [Cp*M(Cl)(P-N-O)] + with bidentate P-N ligands by treatment with NH 4 PF 6 . The cationic complexes [Cp*M(Cl)(P-N-O)] + Cl − have been detected also in solutions of Cp*M(Cl) 2 (P-N-O). The P-N-coordinated complex [Cp*Rh(Cl)(Ph 2 P-C 6 H 4 -C(H)=N-C(H)(CH 2 Ph)CO 2 Me)] + PF 6 − was characterized by X-ray diffraction. From Cp*M(Cl) 2 (P-N-O) and AgBF 4 or AgPF 6 (molar ratio 1 : 2) the dicationic complexes [Cp*M(P-N-O)] 2+ are formed in which the ester group is also coordinated to the metal atom. The Schiff base from 2-(diphenylphosphino)benzaldehyde and allylglycine ester acts as a tridentate ligand, however with coordination of the C=C allyl group instead of the ester function.
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