Platinum(II), palladium(II), and nickel(II) thiosalicylate complexes

Abstract

A series of platinum(II), palladium(II) and nickel(II) complexes containing thiosalicylate ligands have been prepared by the reaction of [MX₂L₂] complexes [X = halide or acetate; L or L₂ = ancillary neutral donor ligand such as a tertiary phosphine or cycloocta-1,5-diene (cod)] with thiosalicylic acid in methanol with added pyridine. Displacement of the cod ligand from [[upper bond 1 start]Pt(SC₆H₄CO[upper bond 1 end]₂)(cod)] with phosphines and phosphites allows the synthesis of additional derivatives. The complexes [[upper bond 1 start]Pt(SC₆H₄CO[upper bond 1 end]₂)(PPh ₃)₂] and [[upper bond 1 start]Ni(SC₆H₄CO[upper bond 1 end]₂)(dppp)] [dppp = 1,3-bis(diphenylphosphino)propane] have been the subjects of single-crystal X-ray diffraction studies. While both complexes contain the expected approximately square-planar metal co-ordination environments, the plane of the thiosalicylate ligand is inclined at an angle of 45.9° to the platinum co-ordination plane, but at only 9.4° to the nickel plane. The results of an electrospray mass spectrometry study of the thiosalicylate complexes and some related thioglycolate, 2-sulfanylpropionate and salicylate derivatives are discussed in terms of the stabilities of the complexes.

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