The trans‐Influence in Platinum (II) Complexes. 1H‐ and 13C‐NMR. and X‐ray structural studies of tridentate Schiff's base complexes of platinum (II)

Abstract 1H‐ and 13C‐NMR. data are reported for the complexes [Pt(1)L] and [Pt(2)L]; 1 = OC6H4CH  NCH2CH2O, 2 = OC6H4CH  NC6H4O; L = PR3, AsR3, C  N (cyclohexyl), DMSO, pyridine, secondary amine. The molecular structures of [Pt (2) (NHEt2)] (I) and [Pt (2) (PPh3)] (II) have been determined by X‐ray analysis. Relevant bond distances for I: Pt‐N (amine) = 2.076 Å, Pt‐N (imine) = 2.017 Å, Pt‐O = 1.992 Å and 2.002 Å; for II: Pt‐P = 2.248 Å, Pt‐N = 2.064 Å, Pt‐O = 1.964 and 2.005 Å. Both the solid and solution state data are interpreted in terms of differences in the trans influence of the ligand L. The question of metal‐ligand d‐p π back bonding to the imine is discussed.