New platinum(II) and palladium(II) quinoline-imine-pyridine, quinoline-imine-thiazole and quinoline-imine-imidazole complexes by metal-assisted condensation reactions

Pt(II) and Pd(II) methyl- and chloro-complexes with the tridentate N-donor ligands ((pyridin-2-yl)methylene)quinolin-8-amine (NNPy), ((pyridin-2-yl)ethylidene)quinolin-8-yl-amine (NNMePy), (phenyl(pyridin-2-yl)methylene)quinolin-8-yl-amine (NNPhPy), ((thiazol-2-yl)methylene)quinolin-8-amine (NNTh) and ((imidazol-4-yl)methylene)quinolin-8-amine (NNImH) were prepared by metal-assisted condensation of 8-aminoquinoline and an ortho-substituted aldehydo- or keto- N-heterocycle. Preliminary reactivity studies involving the coordinated tridentate N-donors, the chloro-ligand and the M-CH3 bond were carried out, leading to the synthesis of several new complexes. During these studies, the formation of a novel five-coordinate Pt(II) carbonyl-complex was observed.

Several palladium(II) and platinum(II) chloro- and methyl-complexes with tridentate N-donor ligands were prepared by reacting a stoichiometric mixture of 8-aminoquinoline and an ortho-substituted aldehydo- or keto- N-heterocycle with the proper Pt(II) or Pd(II) precursor in methanol. Preliminary reactivity studies were carried out. Reaction of the Pd(II) methyl-complexes with CO led to the formation of the corresponding acyl-complexes. A five-coordinated carbonyl-complex was instead obtained by reacting a quinoline-imine-thiazole Pt(II) methyl-complex with CO.Figure optionsDownload as PowerPoint slideHighlights
► New Pd(II) and Pt(II) chloro- and methyl-complexes were prepared.
► Tridentate N-donor ligands were obtained by metal-assisted synthesis.
► Preliminary reactivity studies were carried out.
► Pd(II) methyl-complexes react with CO to give the corresponding acyl-complexes.
► The formation of a five-coordinated Pt(II) carbonyl-methyl complex was observed.