Abstract
An inverse linear relationship between the experimentally observed (195)Pt NMR signals and the overall sum of coordinated halido ligands' ionic radii was discovered in Pt(ii) and Pt(iv) complexes. The reduction of (195)Pt NMR frequencies parallels the increase of coordinated halido ligands' ionic radii sum. This suggests that each halido ligand may act as a conducting ring whose induced electric current shields the (195)Pt NMR signals proportionally to the ionic radius of the coordinated halido ligand.
Highlights
General cooperative effects of single atom ligands on a metal: a 195Pt NMR chemical shift as a function of coordinated halido ligands’ ionic radii overall sum
The reduction of 195Pt NMR frequencies parallels the increase of coordinated halido ligands’ ionic radii sum. This suggests that each halido ligand may act as a conducting ring whose induced electric current shields the 195Pt NMR signals proportionally to the ionic radius of the coordinated halido ligand
In the study of the single crystal X-ray structures and NMR signals of the symmetric pentacoordinate complexes [PtX2(η2-CH2vCH2)(Me2phen)] (X = Cl, Br, I; Me2phen = 2,9-dimethyl-1,10-phenanthroline), we described the evidence of pseudo-ring currents circulating around the Pt–X axes, Fig. 1 and 2
Summary
General cooperative effects of single atom ligands on a metal: a 195Pt NMR chemical shift as a function of coordinated halido ligands’ ionic radii overall sum.
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