Interactions and 2D NOESY. Pd(II) and Pt(II) cylometallation chemistry

✍ Scribed by Paul S. Pregosin; Franz Wombacher

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 867 KB
• Volume: 29
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1260291319

✦ Synopsis

Abstract

Phase sensitive, ^1^H 2D NOESY measurements have been made on a variety of N,N′‐dimethylbenzylamine cyclopalladated complexes with coordinated ligands having pendant CH moieties. For 8‐methylquinoline and benzo [h] quinoline it can be shown that the quinoline‐methyl and benzoquinoline CH‐10 moieties, respectively, reside in a pseudo fifth coordination position above the square planar complex. This information arises primarily from NOEs from one NCH~3~ and H3′, the proton ortho to the PdC bond. Similar NOESY studies have also been carried out for (i) a cyclopalladated aliphatic analog based on Pd(NO~3~(L){N(CH~3~)~2~CH~2~C (CH~3~)(OCH~3~)CH~2~} and (ii) a cyclopalladated phosphite (C∩oP), of the form Pd(NO~3~)(L){P(OEt)~2~OC~6~H~4~}. New platinum complexes of the type trans‐[PtCl~2~L (tertiary phosphine or tertiary arsine)] are presented, and the spin–spin coupling constants from the pendant CH of L to the ^195^Pt are discussed. Several of these complexes can exist in two geometric forms, i.e., for the phosphite complexes: P trans to N, C trans to O as against P trans to O, C trans to N. A distinction between these isomers is made using the same ^1^H NOESY spectra that provide information concerned with the pendant CH functions.